Publications (37)
Simulating Meson Scattering on Spin Quantum Simulators
Elizabeth R. Bennewitz, Brayden Ware, Alexander Schuckert +11
Studying high-energy collisions of composite particles, such as hadrons and nuclei, is an outstanding goal for quantum simulators. However, preparation of hadronic wave packets has…
Topological Crystalline Bose Insulator in Two Dimensions via Entanglement Spectrum
Brayden Ware, Itamar Kimchi, S. A. Parameswaran +1
Strongly correlated analogues of topological insulators have been explored in systems with purely on-site symmetries, such as time-reversal or charge conservation. Here, we use rec…
A sharp phase transition in linear cross-entropy benchmarking
Brayden Ware, Abhinav Deshpande, Dominik Hangleiter +4
Demonstrations of quantum computational advantage and benchmarks of quantum processors via quantum random circuit sampling are based on evaluating the linear cross-entropy benchmar…
Quantum error correction below the surface code threshold
Rajeev Acharya, Laleh Aghababaie-Beni, Igor Aleiner +246
Quantum error correction provides a path to reach practical quantum computing by combining multiple physical qubits into a logical qubit, where the logical error rate is suppressed…
Ising Anyons in Frustration-Free Majorana-Dimer Models
Brayden Ware, Jun Ho Son, Meng Cheng +3
Dimer models have long been a fruitful playground for understanding topological physics. Here we introduce a new class - termed Majorana-dimer models - wherein bosonic dimers are d…
Magic state cultivation on a superconducting quantum processor
Emma Rosenfeld, Craig Gidney, Gabrielle Roberts +292
Fault-tolerant quantum computing requires a universal gate set, but the necessary non-Clifford gates represent a significant resource cost for most quantum error correction archite…
Energy diffusion in weakly interacting chains with fermionic dissipation-assisted operator evolution
En-Jui Kuo, Brayden Ware, Peter Lunts +2
Interacting lattice Hamiltonians at high temperature generically give rise to energy transport governed by the classical diffusion equation; however, predicting the rate of diffusi…
Anomalous low-frequency conductivity in easy-plane XXZ spin chains
Utkarsh Agrawal, Sarang Gopalakrishnan, Romain Vasseur +1
In the easy-plane regime of XXZ spin chains, spin transport is ballistic, with a Drude weight that has a discontinuous fractal dependence on the value of the anisotropy $Î= \cos Ï…
Scaling and logic in the color code on a superconducting quantum processor
Nathan Lacroix, Alexandre Bourassa, Francisco J. H. Heras +212
Quantum error correction is essential for bridging the gap between the error rates of physical devices and the extremely low logical error rates required for quantum algorithms. Re…
Reinforcement Learning Control of Quantum Error Correction
Volodymyr Sivak, Alexis Morvan, Michael Broughton +296
Quantum error correction (QEC) is the primary strategy for protecting a quantum computer from the environment. Its prerequisite is that errors must remain sufficiently rare, which…
Spin crossovers and superdiffusion in the one-dimensional Hubbard model
Michele Fava, Brayden Ware, Sarang Gopalakrishnan +2
We use tools from integrability and generalized hydrodynamics to study finite-temperature dynamics in the one-dimensional Hubbard model. First, we examine charge, spin, and energy…
Quantum simulation of bubble nucleation across a quantum phase transition
De Luo, Federica Maria Surace, Arinjoy De +8
The liquid-vapor transition is a classic example of a discontinuous (first-order) phase transition. Such transitions underlie many phenomena in cosmology, nuclear and particle phys…
A Heuristic for Matrix Product State Simulation of Out-of-Equilibrium Dynamics of Two-Dimensional Quantum Spin Systems
Salvatore MandrÃ, Salvatore Mandrà, Nikita Astrakhantsev +5
Out-of-equilibrium dynamics of non-integrable Hamiltonian many-body quantum systems are characterized by highly entangled wave functions. Near-maximal entanglement arises in system…
Subdiffusive hydrodynamics of nearly-integrable anisotropic spin chains
Jacopo De Nardis, Sarang Gopalakrishnan, Romain Vasseur +1
We address spin transport in the easy-axis Heisenberg spin chain subject to integrability-breaking perturbations. We find that spin transport is subdiffusive with dynamical exponen…
Instability of steady-state mixed-state symmetry-protected topological order to strong-to-weak spontaneous symmetry breaking
Jeet Shah, Christopher Fechisin, Yu-Xin Wang +6
Recent experimental progress in controlling open quantum systems enables the pursuit of mixed-state nonequilibrium quantum phases. We investigate whether open quantum systems hosti…
Topological edge modes without symmetry in quasiperiodically driven spin chains
Aaron J. Friedman, Brayden Ware, Romain Vasseur +1
We construct an example of a 1 quasiperiodically driven spin chain whose edge states can coherently store quantum information, protected by a combination of localization, dynami…
Operator front broadening in chaotic and integrable quantum chains
Javier Lopez-Piqueres, Brayden Ware, Sarang Gopalakrishnan +1
Operator spreading under unitary time evolution has attracted a lot of attention recently, as a way to probe many-body quantum chaos. While quantities such as out-of-time-ordered c…
Mean-field entanglement transitions in random tree tensor networks
Javier Lopez-Piqueres, Brayden Ware, Romain Vasseur
Entanglement phase transitions in quantum chaotic systems subject to projective measurements and in random tensor networks have emerged as a new class of critical points separating…
Visualizing Dynamics of Charges and Strings in (2+1)D Lattice Gauge Theories
Tyler A. Cochran, Bernhard Jobst, Eliott Rosenberg +189
Lattice gauge theories (LGTs) can be employed to understand a wide range of phenomena, from elementary particle scattering in high-energy physics to effective descriptions of many-…
String-Breaking Dynamics in Quantum Adiabatic and Diabatic Processes
Federica Maria Surace, Alessio Lerose, Or Katz +10
Confinement prohibits isolation of color charges, e.g., quarks, in nature via a process called string breaking: the separation of two charges results in an increase in the energy o…
Precision quantum simulation of magnon spectra and interactions
Trond I. Andersen, Nikita Astrakhantsev, Jeronimo Martinez +329
Quantum simulation promises to advance materials discovery by accurately simulating complex states of matter, their microscopic excitations, and macroscopic response functions. The…
Constructive interference at the edge of quantum ergodic dynamics
Dmitry A. Abanin, Rajeev Acharya, Laleh Aghababaie-Beni +262
Quantum observables in the form of few-point correlators are the key to characterizing the dynamics of quantum many-body systems. In dynamics with fast entanglement generation, qua…
Observation of string-breaking dynamics in a quantum simulator
Arinjoy De, Alessio Lerose, De Luo +10
Spontaneous particle-pair formation is a fundamental phenomenon in nature. It can, for example, appear when the potential energy between two particles increases with separation, as…
Stability of superdiffusion in nearly integrable spin chains
Jacopo De Nardis, Sarang Gopalakrishnan, Romain Vasseur +1
Superdiffusive finite-temperature transport has been recently observed in a variety of integrable systems with nonabelian global symmetries. Superdiffusion is caused by giant Golds…
Tensor Networks with Belief Propagation Cannot Feasibly Simulate Google's Quantum Echoes Experiment
Pablo Bermejo, Benjamin Villalonga, Brayden Ware +2
In the recent quantum echoes experiment, Google Quantum AI showed that out-of-time-order correlators (OTOCs) for random-circuit time evolution can be measured using a quantum proce…
Quantum-Classical Separation in Bounded-Resource Tasks Arising from Measurement Contextuality
Shashwat Kumar, Eliott Rosenberg, Alejandro Grajales Dau +280
The prevailing view is that quantum phenomena can be harnessed to tackle certain problems beyond the reach of classical approaches. Quantifying this capability as a quantum-classic…
Demonstrating dynamic surface codes
Alec Eickbusch, Matt McEwen, Volodymyr Sivak +204
A remarkable characteristic of quantum computing is the potential for reliable computation despite faulty qubits. This can be achieved through quantum error correction, which is ty…
Hilbert space signatures of non-ergodic glassy dynamics
Aleksey Lunkin, Nicole S. Ticea, Shashwat Kumar +292
Disorder in quantum many-body systems can drive transitions between ergodic and non-ergodic phases, yet the nature--and even the existence--of these transitions remains intensely d…
Anomalous relaxation and the high-temperature structure factor of XXZ spin chains
Sarang Gopalakrishnan, Romain Vasseur, Brayden Ware
We compute the spin structure factor of XXZ spin chains in the Heisenberg and gapped (Ising) regimes in the high-temperature limit for nonzero magnetization, within the framework o…
Perturbative instability of non-ergodic phases in non-Abelian quantum chains
Brayden Ware, Dmitry Abanin, Romain Vasseur
An important challenge in the field of many-body quantum dynamics is to identify non-ergodic states of matter beyond many-body localization (MBL). Strongly disordered spin chains w…
Hydrodynamics of nonintegrable systems from a relaxation-time approximation
Javier Lopez-Piqueres, Brayden Ware, Sarang Gopalakrishnan +1
We develop a general kinetic theory framework to describe the hydrodynamics of strongly interacting, nonequilibrium quantum systems in which integrability is weakly broken, leaving…
Superuniversality of superdiffusion
Enej Ilievski, Jacopo De Nardis, Sarang Gopalakrishnan +2
Anomalous finite-temperature transport has recently been observed in numerical studies of various integrable models in one dimension; these models share the feature of being invari…
Observation of disorder-induced superfluidity
Nicole Ticea, Elias Portoles, Eliott Rosenberg +298
The emergence of states with long-range correlations in a disordered landscape is rare, as disorder typically suppresses the particle mobility required for long-range coherence. Bu…
Featureless quantum insulator on the honeycomb lattice
Panjin Kim, Hyunyong Lee, Shenghan Jiang +5
We show how to construct fully symmetric, gapped states without topological order on a honey- comb lattice for S = 1/2 spins using the language of projected entangled pair states(P…
Local integrals of motion and the quasiperiodic many-body localization transition
Hansveer Singh, Brayden Ware, Romain Vasseur +1
We study the many body localization (MBL) transition for interacting fermions subject to quasiperiodic potentials by constructing the local integrals of motion (LIOMs) in the MBL p…
Comparing numerical methods for hydrodynamics in a one-dimensional lattice spin model
Stuart Yi-Thomas, Brayden Ware, Jay D. Sau +1
In ergodic quantum spin chains, locally conserved quantities such as energy or particle number generically evolve according to hydrodynamic equations as they relax to equilibrium.…
Subdiffusion and many-body quantum chaos with kinetic constraints
Hansveer Singh, Brayden Ware, Romain Vasseur +1
We investigate the spectral and transport properties of many-body quantum systems with conserved charges and kinetic constraints. Using random unitary circuits, we compute ensemble…