Robust qubit memory is essential for quantum computing, both for near-term devices operating without error correction, and for the long-term goal of a fault-tolerant processor. We directly measure the memory error ${\epsilon}_{m}$ for a ${}^{43}{\mathrm{Ca}}^{+}$ trapped-ion qubit in the small-error regime and find ${\epsilon}_{m}<{10}^{-4}$ for sto...

[Phys. Rev. Lett. 123, 110503] Published Fri Sep 13, 2019

]]>We establish that entropy production, which is crucial to the characterization of thermodynamic irreversibility, is obtained through a variational principle involving the Kulback-Leibler divergence. A simple application of this representation leads to an information-theoretical bound on entropy prod...

[Phys. Rev. Lett. 123, 110603] Published Fri Sep 13, 2019

]]>By example of the nonlinear Kerr mode driven by a laser, we show that hysteresis phenomena in systems featuring a driven-dissipative phase transition can be accurately described in terms of just two collective, dissipative Liouvillian eigenmodes. The key quantities are just two components of a non-A...

[Phys. Rev. Lett. 123, 110604] Published Fri Sep 13, 2019

]]>Axion dark matter differentiates the phase velocities of the circular-polarized photons. In this Letter, a scheme to measure the phase difference by using a linear optical cavity is proposed. If the scheme is applied to the Fabry-Pérot arm of Advanced-LIGO-like (Cosmic-Explorer-Like) gravitational w...

[Phys. Rev. Lett. 123, 111301] Published Fri Sep 13, 2019

]]>Infinite-dimensional conformal symmetry in two dimensions leads to integrability of 2D conformal field theories (CFTs) by giving rise to an infinite tower of local conserved quantum Korteweg–de Vries (qKdV) charges in involution. We discuss how the presence of conserved charges constrains equilibrat...

[Phys. Rev. Lett. 123, 111602] Published Fri Sep 13, 2019

]]>This Letter reports the first extraction of individual antineutrino spectra from ${}^{235}\mathrm{U}$ and ${}^{239}\mathrm{Pu}$ fission and an improved measurement of the prompt energy spectrum of reactor antineutrinos at Daya Bay. The analysis uses $3.5\times {10}^{6}$ inverse beta-decay candidates in four near antineutrino detectors in 1958 ...

[Phys. Rev. Lett. 123, 111801] Published Fri Sep 13, 2019

]]>This Letter presents the first experimental observation of the attractive strong interaction between a proton and a multistrange baryon (hyperon) ${\mathrm{\Xi}}^{-}$. The result is extracted from two-particle correlations of combined $p\text{\u2212}{\mathrm{\Xi}}^{-}\oplus \overline{p}\text{\u2212}{\overline{\mathrm{\Xi}}}^{+}$ pairs measured in $p\text{\u2212}\mathrm{Pb}$ collisions at $\sqrt{{s}_{\mathrm{NN}}}=5.02\text{\hspace{0.17em}}\text{\hspace{0.17em}}\mathrm{TeV}$ at the LHC with ALIC...

[Phys. Rev. Lett. 123, 112002] Published Fri Sep 13, 2019

]]>One of the few exact results for the description of the time evolution of an inhomogeneous, interacting many-particle system is given by the harmonic potential theorem (HPT). The relevance of this theorem is that it sets a tight constraint on time-dependent many-body approximations. In this contribu...

[Phys. Rev. Lett. 123, 112501] Published Fri Sep 13, 2019

]]>We experimentally and theoretically determine the magic wavelength of the $(5{s}^{2}){{}^{1}S}_{0}-(5s5p){}^{3}{P}_{0}$ clock transition of ${}^{111}\mathrm{Cd}$ to be 419.88(14) and 420.1(7) nm. To perform Lamb-Dicke spectroscopy of the clock transition, we use narrow-line laser cooling on the ${{}^{1}S}_{0}-{{}^{3}P}_{1}$ transition to cool the atoms to $6\text{\hspace{0.17em}}\text{\hspace{0.17em}}\mu \mathrm{K}$ a...

[Phys. Rev. Lett. 123, 113201] Published Fri Sep 13, 2019

]]>A model-potential approach has been developed to study positron interactions with molecules. Binding energies and annihilation rates are calculated for positron bound states with a range of alkane molecules, including rings and isomers. The calculated binding energies are in good agreement with expe...

[Phys. Rev. Lett. 123, 113402] Published Fri Sep 13, 2019

]]>In this Letter, we investigate the effect of orbital angular momentum (OAM) on elastic photon-photon scattering in a vacuum for the first time. We define exact solutions to the vacuum electromagnetic wave equation which carry OAM. Using those, the expected coupling between three initial waves is der...

[Phys. Rev. Lett. 123, 113604] Published Fri Sep 13, 2019

]]>We examine the dynamics of Rydberg polaritons with dipolar interactions that propagate in multiple spatial modes. The dipolar excitation exchange between different Rydberg states mediates an effective exchange between polaritons that enables photons to hop across different spatial channels. Remarkab...

[Phys. Rev. Lett. 123, 113605] Published Fri Sep 13, 2019

]]>Phase frustration in periodic lattices is responsible for the formation of dispersionless flatbands. The absence of any kinetic energy scale makes flatband physics critically sensitive to perturbations and interactions. We report on the experimental investigation of the nonlinear response of cavity ...

[Phys. Rev. Lett. 123, 113901] Published Fri Sep 13, 2019

]]>We propose currently feasible experiments using small, isolated systems of ultracold atoms to investigate the effects of dynamical chaos in the microscopic onset of irreversibility. A control parameter is tuned past a critical value, then back to its initial value; hysteresis appears as a finite pro...

[Phys. Rev. Lett. 123, 114101] Published Fri Sep 13, 2019

]]>Despite the presence of strong fluctuations, many turbulent systems such as Rayleigh-Bénard convection and Taylor-Couette flow display self-organized large-scale flow patterns. How do small-scale turbulent fluctuations impact the emergence and stability of such large-scale flow patterns? Here, we ap...

[Phys. Rev. Lett. 123, 114501] Published Fri Sep 13, 2019

]]>Criticality in statistical physics naturally emerges at isolated points in the phase diagram. Jamming of spheres is not an exception: varying density, it is the critical point that separates the unjammed phase where spheres do not overlap and the jammed phase where they cannot be arranged without ov...

[Phys. Rev. Lett. 123, 115702] Published Fri Sep 13, 2019

]]>Disordered carbons comprise graphene fragments assembled into three-dimensional networks. It has long been debated whether these networks contain positive curvature, as seen in fullerenes, negative curvature, as proposed for the schwarzite structures, or zero curvature, as in ribbons. We present a m...

[Phys. Rev. Lett. 123, 116105] Published Fri Sep 13, 2019

]]>Fermi gases in two dimensions display collective dynamics originating from head-on collisions, a collinear carrier scattering process that dominates angular relaxation at not-too-high temperatures $T\ll {T}_{F}$. In this regime, a large family of excitations emerges, with an odd-parity angular structure of mo...

[Phys. Rev. Lett. 123, 116601] Published Fri Sep 13, 2019

]]>Magnons in ferromagnets behave as a viscous fluid over a length scale, the momentum-relaxation length, below which momentum-conserving scattering processes dominate. We show theoretically that in this hydrodynamic regime viscous effects lead to a sign change in the magnon chemical potential, which c...

[Phys. Rev. Lett. 123, 117203] Published Fri Sep 13, 2019

]]>We experimentally study the spin dynamics in a gadolinium iron garnet single crystal using broadband ferromagnetic resonance. Close to the ferrimagnetic compensation temperature, we observe ultrastrong coupling of clockwise and counterclockwise magnon modes. The magnon-magnon coupling strength reach...

[Phys. Rev. Lett. 123, 117204] Published Fri Sep 13, 2019

]]>There is increasing evidence that mammalian cells not only crawl on substrates but can also swim in fluids. To elucidate the mechanisms of the onset of motility of cells in suspension, a model which couples actin and myosin kinetics to fluid flow is proposed and solved for a spherical shape. The swi...

[Phys. Rev. Lett. 123, 118101] Published Fri Sep 13, 2019

]]>[Phys. Rev. Lett. 123, 119601] Published Fri Sep 13, 2019

]]>[Phys. Rev. Lett. 123, 119602] Published Fri Sep 13, 2019

]]>Quantum coherence is a fundamental feature of quantum mechanics and an underlying requirement for most quantum information tasks. In the resource theory of coherence, incoherent states are diagonal with respect to a fixed orthonormal basis; i.e., they can be seen as arising from a von Neumann measur...

[Phys. Rev. Lett. 123, 110402] Published Thu Sep 12, 2019

]]>The fluctuation theorem is the fundamental equality in nonequilibrium thermodynamics that is used to derive many important thermodynamic relations, such as the second law of thermodynamics and the Jarzynski equality. Recently, the thermodynamic uncertainty relation was discovered, which states that ...

[Phys. Rev. Lett. 123, 110602] Published Thu Sep 12, 2019

]]>A fresh look at data from the first detected black-hole merger supports the “no hair” theorem and proves the potential of black-hole spectroscopy.

[Phys. Rev. Lett. 123, 111102] Published Thu Sep 12, 2019

]]>We present the first amplitude analysis of the decay ${D}_{s}^{+}\to {\pi}^{+}{\pi}^{0}\eta $. We use an ${e}^{+}{e}^{-}$ collision data sample corresponding to an integrated luminosity of $3.19\text{\hspace{0.17em}}\text{\hspace{0.17em}}{\mathrm{fb}}^{-1}$ collected with the BESIII detector at a center-of-mass energy of 4.178 GeV. We observe for the first time the $W$-annihilation dominant decays ${D}_{s}^{...}$

[Phys. Rev. Lett. 123, 112001] Published Thu Sep 12, 2019

]]>In slow collisions of two bare nuclei with the total charge larger than the critical value ${Z}_{\mathrm{cr}}\approx 173$, the initially neutral vacuum can spontaneously decay into the charged vacuum and two positrons. The detection of the spontaneous emission of positrons would be direct evidence of this fundamental phen...

[Phys. Rev. Lett. 123, 113401] Published Thu Sep 12, 2019

]]>We experimentally demonstrate storage and on-demand release of phase-sensitive, photon-number superposition states of the form $\alpha |0\u27e9+\beta {e}^{i\theta}|1\u27e9$ for an optical quantized oscillator mode. For this purpose, we newly developed a phase-probing mechanism compatible with a storage system composed of two concat...

[Phys. Rev. Lett. 123, 113603] Published Thu Sep 12, 2019

]]>We observe the formation of a high-pressure staircase pedestal ($\approx 16\u201320\text{\hspace{0.17em}}\text{\hspace{0.17em}}\mathrm{kPa}$) in the DIII-D tokamak when large amplitude edge localized modes are suppressed using resonant magnetic perturbations. The staircase pedestal is characterized by a flattening of the density and temperature profiles in midped...

[Phys. Rev. Lett. 123, 115001] Published Thu Sep 12, 2019

]]>The triboelectric effect, charge transfer during sliding, is well established but the thermodynamic driver is not well understood. We hypothesize here that flexoelectric potential differences induced by inhomogeneous strains at nanoscale asperities drive tribocharge separation. Modeling single asper...

[Phys. Rev. Lett. 123, 116103] Published Thu Sep 12, 2019

]]>Bound states in the continuum in periodic photonic systems like photonic crystal slabs are proved to be accompanied by vortex polarization singularities on the photonic bands in the momentum space. The winding structures of polarization states not only widen the field of topological physics but also...

[Phys. Rev. Lett. 123, 116104] Published Thu Sep 12, 2019

]]>Two-dimensional (2D) materials have attracted great attention and spurred rapid development in both fundamental research and device applications. The search for exotic physical properties, such as magnetic and topological order, in 2D materials could enable the realization of novel quantum devices a...

[Phys. Rev. Lett. 123, 116401] Published Thu Sep 12, 2019

]]>We report the emergence of zero-energy states in the trivial phase of a short nanowire junction with a strong spin-orbit coupling and magnetic field, formed by strong coupling between the nanowire and two superconductors. The zero-energy states appear in the junction when the superconductors induce ...

[Phys. Rev. Lett. 123, 117001] Published Thu Sep 12, 2019

]]>Investigating exotic magnetic materials with spintronic techniques is effective at advancing magnetism as well as spintronics. In this work, we report unusual field-induced suppression of the spin Seebeck effect (SSE) in a quasi-one-dimensional frustrated spin-$\frac{1}{2}$ magnet ${\mathrm{LiCuVO}}_{4}$, known to exhibit spi...

[Phys. Rev. Lett. 123, 117202] Published Thu Sep 12, 2019

]]>Quantum metrology concerns estimating a parameter from multiple identical uses of a quantum channel. We extend quantum metrology beyond this standard setting and consider the estimation of a physical process with quantum memory, here referred to as a parametrized quantum comb. We present a theoretic...

[Phys. Rev. Lett. 123, 110501] Published Wed Sep 11, 2019

]]>Quantum error correction was invented to allow for fault-tolerant quantum computation. Systems with topological order turned out to give a natural physical realization of quantum error correcting codes (QECC) in their ground spaces. More recently, in the context of the anti-de Sitter/conformal field...

[Phys. Rev. Lett. 123, 110502] Published Wed Sep 11, 2019

]]>We report on the results of the LISA Pathfinder (LPF) free-fall mode experiment, in which the control force needed to compensate the quasistatic differential force acting on two test masses is applied intermittently as a series of “impulse” forces lasting a few seconds and separated by roughly 350 s...

[Phys. Rev. Lett. 123, 111101] Published Wed Sep 11, 2019

]]>The study of quantum phase transitions requires the preparation of a many-body system near its ground state, a challenging task for many experimental systems. The measurement of quench dynamics, on the other hand, is now a routine practice in most cold atom platforms. Here we show that quintessentia...

[Phys. Rev. Lett. 123, 115701] Published Wed Sep 11, 2019

]]>We describe simulations of a quasi-one-dimensional, vibrated granular gas which exhibits an apparent phase separation into a liquidlike phase and a gaslike phase. In thermal equilibrium, such a phase separation in one dimension is prohibited by entropic considerations. We propose that the granular g...

[Phys. Rev. Lett. 123, 118001] Published Wed Sep 11, 2019

]]>Narrow escape from confinement through a nanochannel is the critical step of complex transport processes including size-exclusion-based separations, oil and gas extraction from the microporous subsurface environment, and ribonucleic acid translocation through nuclear pore complex channels. While nar...

[Phys. Rev. Lett. 123, 118002] Published Wed Sep 11, 2019

]]>A well-known quantum experiment is performed on a rotating lab table—offering a probe of quantum physics in a noninertial reference frame.

[Phys. Rev. Lett. 123, 110401] Published Tue Sep 10, 2019

]]>The Anderson localization transition is one of the most well studied examples of a zero temperature quantum phase transition. On the other hand, many open questions remain about the phenomenology of disordered systems driven far out of equilibrium. Here we study the localization transition in the pr...

[Phys. Rev. Lett. 123, 110601] Published Tue Sep 10, 2019

]]>We show that using complex, spin-restricted orbitals in Kohn-Sham (KS) density functional theory allows one to access a new class of densities that is not accessible by either spin-restricted (RKS) or spin-unrestricted (UKS) orbitals. We further show that the real part of a complex RKS (CRKS) densit...

[Phys. Rev. Lett. 123, 113001] Published Tue Sep 10, 2019

]]>We present an experimental study on nonequilibrium dynamics of a spinor condensate after it is quenched across a superfluid to Mott insulator (MI) phase transition in cubic lattices. Intricate dynamics consisting of spin-mixing oscillations at multiple frequencies are observed in time evolutions of ...

[Phys. Rev. Lett. 123, 113002] Published Tue Sep 10, 2019

]]>Through a combination of experimental measurements and theoretical modeling, we describe a strongly orbital-polarized insulating ground state in an ${({\mathrm{LaTiO}}_{3})}_{2}/{({\mathrm{LaCoO}}_{3})}_{2}$ oxide heterostructure. X-ray absorption spectra and *ab initio* calculations show that an electron is transferred from the titanate to...

[Phys. Rev. Lett. 123, 117201] Published Tue Sep 10, 2019

]]>Unexpected light propagation effects, such as negative refraction, have been reported in artificial media. Leveraging on the intersubband resonances in heterostructured semiconductors, we show that all possible optical regimes, ranging from classical dieletric and metal to hyperbolic metamaterial ty...

[Phys. Rev. Lett. 123, 117401] Published Tue Sep 10, 2019

]]>Detailed low temperature magnetotransport measurements of encapsulated bilayer MoS${}_{2}$ reveal that, in contrast to bilayer graphene, in this system the two layers behave as independent electronic systems with no tunnel coupling.

[Phys. Rev. Lett. 123, 117702] Published Tue Sep 10, 2019

]]>We reconsider the tensionless limit on bosonic closed string theory, where the 3D Bondi-Metzner-Sachs (BMS) algebra appears as symmetries on the world sheet, as opposed to two copies of the Virasoro algebra in the case of the usual tensile theory. This is an ultrarelativistic limit on the world shee...

[Phys. Rev. Lett. 123, 111601] Published Mon Sep 09, 2019

]]>Quantum nondemolition measurements with fast pulses present the best method to the date for achieving a motional ground state of a nanomechanical resonator.

[Phys. Rev. Lett. 123, 113601] Published Mon Sep 09, 2019

]]>We experimentally demonstrate a method for realizing quantum squeezing enhancement which is induced by the interference in a two-beam phase-sensitive amplifier (PSA) based on a four-wave mixing process. Compared to the normal phase-insensitive amplifier with an intensity-difference squeezing (IDS) o...

[Phys. Rev. Lett. 123, 113602] Published Mon Sep 09, 2019

]]>Direct measurement of the bending rigidity of multilayer graphene, molybdenum disulfide, and hexagonal boron nitride, shows a response of the multilayers consistent with nonlinear plate theory.

[Phys. Rev. Lett. 123, 116101] Published Mon Sep 09, 2019

]]>Studying the frictional properties of interfaces with dynamic chemical bonds advances understanding of the mechanism underlying rate and state laws, and offers new pathways for the rational control of frictional response. In this work, we revisit the load dependence of interfacial chemical-bond-indu...

[Phys. Rev. Lett. 123, 116102] Published Mon Sep 09, 2019

]]>It’s now possible to harvest energy at the mesoscopic scale by exploiting the resonant tunneling in a nanoscale thermoelectric device consisting of two quantum dots.

[Phys. Rev. Lett. 123, 117701] Published Mon Sep 09, 2019

]]>The average density profile of a one-dimensional interacting gas shows rich physical phenomenology as a function of the interaction range and temperature.

[Phys. Rev. Lett. 123, 100603] Published Fri Sep 06, 2019

]]>The contact process is a paradigmatic classical stochastic system displaying critical behavior even in one dimension. It features a nonequilibrium phase transition into an absorbing state that has been widely investigated and shown to belong to the directed percolation universality class. When the s...

[Phys. Rev. Lett. 123, 100604] Published Fri Sep 06, 2019

]]>We demonstrate a breakthrough in the capabilities of robust, broad-parameter space searches for continuous gravitational waves. With a large scale search for continuous gravitational waves on the O1 LIGO data, we prove that our Falcon search achieves the sensitivity improvements expected from the us...

[Phys. Rev. Lett. 123, 101101] Published Fri Sep 06, 2019

]]>We propose that $\mathcal{O}(10\text{\hspace{0.17em}}\text{\hspace{0.17em}}{M}_{\odot})$ black holes observed by LIGO/Virgo originate from a *first order* phase transition at a temperature ${T}_{*}\lesssim 100\text{\hspace{0.17em}}\text{\hspace{0.17em}}\mathrm{MeV}$, associated with ${\mathrm{QCD}}^{\prime}$—an early Universe deformation of the standard model QCD. This is realized by keeping the quark masses small compared to confinement scale down...

[Phys. Rev. Lett. 123, 101102] Published Fri Sep 06, 2019

]]>We describe a new class of resonances for extreme mass-ratio inspirals (EMRIs): tidal resonances, induced by the tidal field of nearby stars or stellar-mass black holes. A tidal resonance can be viewed as a general relativistic extension of the Kozai-Lidov resonances in Newtonian systems and is dist...

[Phys. Rev. Lett. 123, 101103] Published Fri Sep 06, 2019

]]>We present $\mathcal{O}({10}^{15})$ string compactifications with the exact chiral spectrum of the standard model of particle physics. This ensemble of globally consistent $F$-theory compactifications automatically realizes gauge coupling unification. Utilizing the power of algebraic geometry, all global consistency c...

[Phys. Rev. Lett. 123, 101601] Published Fri Sep 06, 2019

]]>The measurement of the triple-differential dijet production cross section as a function of the average transverse momentum ${p}_{T,\mathrm{avg}}$, half the rapidity separation ${y}^{*}$, and the boost ${y}_{b}$ of the two leading jets in the event enables a kinematical scan of the underlying parton momentum distributions. We com...

[Phys. Rev. Lett. 123, 102001] Published Fri Sep 06, 2019

]]>An extensive, model-independent analysis of the nature of triaxial deformation in ${}^{76}\mathrm{Ge}$, a candidate for neutrinoless double-beta ($0\nu \beta \beta $) decay, was carried out following multistep Coulomb excitation. Shape parameters deduced on the basis of a rotational-invariant sum-rule analysis provided considerab...

[Phys. Rev. Lett. 123, 102501] Published Fri Sep 06, 2019

]]>A new cooling technique targets negative ions, which are typically resistant to cooling methods that work with atoms and positive ions.

[Phys. Rev. Lett. 123, 103201] Published Fri Sep 06, 2019

]]>A technique based on high harmonic generation is proposed to probe and characterize electric currents in excited atomic and molecular media.

[Phys. Rev. Lett. 123, 103202] Published Fri Sep 06, 2019

]]>This Letter sets a road map towards an experimental realization of strong coupling between free electrons and photons and analytically explores entanglement phenomena that emerge in this regime. The proposed model unifies the strong-coupling predictions with known electron-photon interactions. Addit...

[Phys. Rev. Lett. 123, 103602] Published Fri Sep 06, 2019

]]>We study nonlinear effects in two-dimensional photonic metasurfaces supporting topologically protected helical edge states at the nanoscale. We observe strong third-harmonic generation mediated by optical nonlinearities boosted by multipolar Mie resonances of silicon nanoparticles. Variation of the ...

[Phys. Rev. Lett. 123, 103901] Published Fri Sep 06, 2019

]]>We observe plasma heating due to collisional diffusion across a separatrix when a magnesium ion column in a Penning-Malmberg trap is cyclically pushed back and forth across a partial trapping barrier. The barrier is an externally applied axisymmetric “squeeze” potential, which creates a velocity sep...

[Phys. Rev. Lett. 123, 105002] Published Fri Sep 06, 2019

]]>Relaxation processes significantly influence the properties of glass materials. However, understanding their specific origins is difficult; even more challenging is to forecast them theoretically. In this study, using microseconds molecular dynamics simulations together with an accurate many-body in...

[Phys. Rev. Lett. 123, 105701] Published Fri Sep 06, 2019

]]>In heavy-fermion compounds, the dual character of $f$ electrons underlies their rich and often exotic properties like fragile heavy quasiparticles, a variety of magnetic orders and unconventional superconductivity. $5f$-electron actinide materials provide a rich setting to elucidate the larger and outst...

[Phys. Rev. Lett. 123, 106402] Published Fri Sep 06, 2019

]]>The spin states of magnetic molecules have advantageous attributes as carriers of quantum information. However, spin-vibration coupling in molecules causes a decay of excited spin states and a loss of spin coherence. Here, we detect excitations of spin-vibration states in single nickelocene molecule...

[Phys. Rev. Lett. 123, 106803] Published Fri Sep 06, 2019

]]>We introduce a strategy to write down lattice models of spin rotational symmetric Hamiltonians with arbitrary spin $S$ that are Marshall positive and can be simulated efficiently using world-line Monte Carlo methods. As an application of our approach we consider a square lattice $S=1$ model for which we...

[Phys. Rev. Lett. 123, 107202] Published Fri Sep 06, 2019

]]>We perform tunneling measurements on indium antimonide nanowire-superconductor hybrid devices fabricated for the studies of Majorana bound states. At finite magnetic field, resonances that strongly resemble Majorana bound states, including zero-bias pinning, become common to the point of ubiquity. S...

[Phys. Rev. Lett. 123, 107703] Published Fri Sep 06, 2019

]]>We evaluate the rates of energy and phase relaxation of a superconducting qubit caused by stray photons with energy exceeding the threshold for breaking a Cooper pair. All channels of relaxation within this mechanism are associated with the change in the charge parity of the qubit, enabling the sepa...

[Phys. Rev. Lett. 123, 107704] Published Fri Sep 06, 2019

]]>Nonequilibrium stochastic reaction networks are commonly found in both biological and nonbiological systems, but have remained hard to analyze because small differences in rate functions or topology can change the dynamics drastically. Here, we conjecture exact quantitative inequalities that relate ...

[Phys. Rev. Lett. 123, 108101] Published Fri Sep 06, 2019

]]>Trapped ions are a promising platform for envisioned quantum simulators, with outstanding results in one-dimensional ion crystals. However, theory requires not only interactions at long range, but also higher dimensionality. We operate a basic triangular array of three individually trapped ions base...

[Phys. Rev. Lett. 123, 100504] Published Thu Sep 05, 2019

]]>Two independent studies demonstrate the practicality of twin-field quantum key distribution—a promising approach to perform quantum cryptography over long distances.

[Phys. Rev. Lett. 123, 100505] Published Thu Sep 05, 2019

]]>Two independent studies demonstrate the practicality of twin-field quantum key distribution—a promising approach to perform quantum cryptography over long distances.

[Phys. Rev. Lett. 123, 100506] Published Thu Sep 05, 2019

]]>We consider the characterization of entanglement depth in a quantum many-body system from the device-independent perspective; that is, we aim at certifying how many particles are genuinely entangled without relying on assumptions on the system itself nor on the measurements performed. We obtain devi...

[Phys. Rev. Lett. 123, 100507] Published Thu Sep 05, 2019

]]>We present a model for glassy dynamics in supercooled liquid mixtures. Given the relaxation behavior of individual supercooled liquids, the model predicts the relaxation times of their mixtures as temperature is decreased. The model is based on dynamical facilitation theory for glassy dynamics, whic...

[Phys. Rev. Lett. 123, 100602] Published Thu Sep 05, 2019

]]>Asymptotic Safety, a renormalization group based approach to quantum gravity, suggests a possible path towards resolving spacetime singularities.

[Phys. Rev. Lett. 123, 101301] Published Thu Sep 05, 2019

]]>Epitaxial strain has been shown to drive structural phase transitions along with novel functionalities in perovskite-based thin films. Aliovalent doping at the $A$ site can drive an insulator-to-metal and magnetic transitions in perovskites along with a variety of interesting structural and electronic...

[Phys. Rev. Lett. 123, 107201] Published Thu Sep 05, 2019

]]>We demonstrate time-resolved nonlinear extreme-ultraviolet absorption spectroscopy on multiply charged ions, here applied to the doubly charged neon ion, driven by a phase-locked sequence of two intense free-electron laser pulses. Absorption signatures of resonance lines due to $2p\u20133d$ bound–bound tra...

[Phys. Rev. Lett. 123, 103001] Published Wed Sep 04, 2019

]]>Motivated by the novel insulating state of ${\mathrm{Sr}}_{2}{\mathrm{IrO}}_{4}$ from strong spin-orbit coupling (SOC), we investigate, by means of angle resolved photoemission, the metal-insulator transition (MIT) mechanism in ${\mathrm{Sr}}_{2-x}{\mathrm{La}}_{x}{\mathrm{RhO}}_{4}$ whose mother compound is isovalent and isostructural but has smaller SOC strength compare...

[Phys. Rev. Lett. 123, 106401] Published Wed Sep 04, 2019

]]>We consider granular quantum matter defined by Sachdev-Ye-Kitaev dots coupled via random one-body hopping. Within the framework of Schwarzian field theory, we identify a zero-temperature quantum phase transition between an insulating phase at weak and a metallic phase at strong hopping. The critical...

[Phys. Rev. Lett. 123, 106601] Published Wed Sep 04, 2019

]]>In the absence of time-reversal symmetry, viscous electron flow hosts a number of interesting phenomena, of which we focus here on the Hall viscosity. Taking a step beyond the hydrodynamic definition of the Hall viscosity, we derive a generalized relation between the Hall viscosity and the transvers...

[Phys. Rev. Lett. 123, 106801] Published Wed Sep 04, 2019

]]>A new technique inserts single-ion impurities into a crystal reliably and with a precision of tens of nanometers.

[Phys. Rev. Lett. 123, 106802] Published Wed Sep 04, 2019

]]>Instead of gradually dispersing after release, a densely jammed athermal system of particles forms clusters that disappear and reform.

[Phys. Rev. Lett. 123, 108001] Published Wed Sep 04, 2019

]]>Macromolecules contain molecular units as the coding information for their correlated structures in physical dimensions. The relationship between these two features is governed by the interaction energies of the involved molecular units and their encoded sequences. We present a neural network algori...

[Phys. Rev. Lett. 123, 108002] Published Wed Sep 04, 2019

]]>We study the emergence of critical dynamics in the steady shear rheology of fluidized soft glassy materials. Within a mesoscale elastoplastic model accounting for a shear band instability, we show how additional noise can induce a transition from a phase separated to homogeneous flow, accompanied by...

[Phys. Rev. Lett. 123, 108003] Published Wed Sep 04, 2019

]]>Nonadiabatic holonomic quantum computation (NHQC) has been developed to shorten the construction times of geometric quantum gates. However, previous NHQC gates require the driving Hamiltonian to satisfy a set of rather restrictive conditions, reducing the robustness of the resulting geometric gates ...

[Phys. Rev. Lett. 123, 100501] Published Tue Sep 03, 2019

]]>Charge and energy transfer in biological and synthetic organic materials are strongly influenced by the coupling of electronic states to a highly structured dissipative environment. Nonperturbative simulations of these systems require a substantial computational effort, and current methods can only ...

[Phys. Rev. Lett. 123, 100502] Published Tue Sep 03, 2019

]]>Quantum computing has seen tremendous progress in past years. Due to implementation complexity and cost, the future path of quantum computation is strongly believed to delegate computational tasks to powerful quantum servers on the cloud. Universal blind quantum computing (UBQC) provides the protoco...

[Phys. Rev. Lett. 123, 100503] Published Tue Sep 03, 2019

]]>We study the effect of a linear tunneling coupling between two-dimensional systems, each separately exhibiting the topological Berezinskii-Kosterlitz-Thouless (BKT) transition. In the uncoupled limit, there are two phases: one where the one-body correlation functions are algebraically decaying and t...

[Phys. Rev. Lett. 123, 100601] Published Tue Sep 03, 2019

]]>Cold samples of calcium atoms are prepared in the metastable ${}^{3}{P}_{1}$ state inside an optical cavity resonant with the narrow band (375 Hz) ${{}^{1}S}_{0}\to {{}^{3}P}_{1}$ intercombination line at 657 nm. We observe a superradiant emission of hyperbolic secant shaped pulses into the cavity with an intensity proportional to the ...

[Phys. Rev. Lett. 123, 103601] Published Tue Sep 03, 2019

]]>This Letter proposes a realistic implementation of the curved relativistic mirror concept to reach unprecedented light intensities in experiments. The scheme is based on relativistic plasma mirrors that are optically curved by laser radiation pressure. Its validity is supported by cutting-edge three...

[Phys. Rev. Lett. 123, 105001] Published Tue Sep 03, 2019

]]>Recent theoretical investigations [A. B. Belonoshko *et al.* Nat. Geosci. **10**, 312 (2017)] revealed the occurrence of the concerted migration of several atoms in bcc Fe at inner-core temperatures and pressures. Here, we combine first-principles and semiempirical atomistic simulations to show that a dif...

[Phys. Rev. Lett. 123, 105501] Published Tue Sep 03, 2019

]]>State-to-state scattering dynamics of ${\mathrm{H}}_{2}\mathrm{O}$ from Cu(111) has been studied by a fully coupled quantum mechanical model which explicitly accounts for the most important molecular degrees of freedom, based on a first-principles determined potential energy surface. When ${\mathrm{H}}_{2}\mathrm{O}$ in its antisymmetric O-H stretc...

[Phys. Rev. Lett. 123, 106001] Published Tue Sep 03, 2019

]]>A new design for a cavity spintronic device obtains a strong photon-magnon coupling with a magnet that is over 1000 times smaller than previously used magnets.

[Phys. Rev. Lett. 123, 107701] Published Tue Sep 03, 2019

]]>A new design for a cavity spintronic device obtains a strong photon-magnon coupling with a magnet that is over 1000 times smaller than previously used magnets.

[Phys. Rev. Lett. 123, 107702] Published Tue Sep 03, 2019

]]>Adiabatic processes in complex quantum systems can be sped up by introducing simple oscillations to the control Hamiltonian.

[Phys. Rev. Lett. 123, 090602] Published Fri Aug 30, 2019

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