Hongzheng Zhao
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View article: Complex and tunable heating in conformal field theories with structured drives via classical ergodicity breaking
Complex and tunable heating in conformal field theories with structured drives via classical ergodicity breaking Open
Emission and absorption of energy are fundamental aspects of nonequilibrium dynamics. The heating induced by driving a many-body system is perhaps the most straightforward diagnostic of the process of equilibration, or the lack thereof. Ga…
View article: Experimental observation of a time rondeau crystal
Experimental observation of a time rondeau crystal Open
Conventional phases of matter can be characterized by the symmetries they break, one example being water ice whose crystalline structure breaks the continuous translation symmetry of space. Recently, breaking of time-translation symmetry w…
View article: Prethermal gauge structure and surface growth in $\mathbb{Z}_2$ lattice gauge theories
Prethermal gauge structure and surface growth in $\mathbb{Z}_2$ lattice gauge theories Open
Universal aspects of thermalization in interacting many-body systems are typically challenging to derive microscopically, yet provide a powerful framework for understanding emergent phenomena. Here, we numerically study the mean-field dyna…
View article: Non-Hermitian delocalization in one dimension via emergent compactness
Non-Hermitian delocalization in one dimension via emergent compactness Open
Potential disorder in one dimension leads to Anderson localization of the entire spectrum. Upon sacrificing Hermiticity by adding nonreciprocal hopping, the non-Hermitian skin effect competes with localization. We find another route for de…
View article: Complex and tunable heating in conformal field theories with structured drives via classical ergodicity breaking
Complex and tunable heating in conformal field theories with structured drives via classical ergodicity breaking Open
Emission and absorption of energy are fundamental aspects of non-equilibrium dynamics. The heating induced by driving a many-body system is perhaps the most straightforward diagnostic of the process of equilibration, or the lack thereof. G…
View article: Prethermalization by Random Multipolar Driving on a 78-Qubit Superconducting Processor
Prethermalization by Random Multipolar Driving on a 78-Qubit Superconducting Processor Open
Time-dependent drives hold the promise of realizing non-equilibrium many-body phenomena that are absent in undriven systems. Yet, drive-induced heating normally destabilizes the systems, which can be parametrically suppressed in the high-f…
View article: Engineering Hierarchical Symmetries
Engineering Hierarchical Symmetries Open
The capacity to custom tailor the properties of quantum matter and materials is a central requirement for enlarging their range of possible functionalities. A particularly promising route is the use of driving protocols to engineer specifi…
View article: Non-Hermitian delocalization in 1D via emergent compactness
Non-Hermitian delocalization in 1D via emergent compactness Open
Potential disorder in 1D leads to Anderson localization of the entire spectrum. Upon sacrificing hermiticity by adding non-reciprocal hopping, the non-Hermitian skin effect competes with localization. We find another route for delocalizati…
View article: Floquet-engineered Emergent Massive Nambu-Goldstone Modes
Floquet-engineered Emergent Massive Nambu-Goldstone Modes Open
We present a general framework to implement massive Nambu-Goldstone quasi-particles in driven many-body systems. The underlying mechanism leverages an explicit Lie group structure imprinted into an effective Hamiltonian that governs the dy…
View article: Adaptive Trotterization for Time-Dependent Hamiltonian Quantum Dynamics Using Piecewise Conservation Laws
Adaptive Trotterization for Time-Dependent Hamiltonian Quantum Dynamics Using Piecewise Conservation Laws Open
Digital quantum simulation relies on Trotterization to discretize time evolution into elementary quantum gates. On current quantum processors with notable gate imperfections, there is a critical trade-off between improved accuracy for fine…
View article: Learning effective Hamiltonians for adaptive time-evolution quantum algorithms
Learning effective Hamiltonians for adaptive time-evolution quantum algorithms Open
Digital quantum simulation of many-body dynamics relies on Trotterization to decompose the target time evolution into elementary quantum gates operating at a fixed equidistant time discretization. Recent advances have outlined protocols en…
View article: Experimental observation of a time rondeau crystal: Temporal Disorder in Spatiotemporal Order
Experimental observation of a time rondeau crystal: Temporal Disorder in Spatiotemporal Order Open
Our understanding of phases of matter relies on symmetry breaking, one example being water ice whose crystalline structure breaks the continuous translation symmetry of space. Recently, breaking of time translation symmetry was observed in…
View article: Engineering Hierarchical Symmetries
Engineering Hierarchical Symmetries Open
The capacity to custom tailor the properties of quantum matter and materials is a central requirement for enlarging their range of possible functionalities. A particularly promising route is the use of driving protocols to engineer specifi…
View article: Prethermalization in aperiodically kicked many-body dynamics
Prethermalization in aperiodically kicked many-body dynamics Open
Driven many-body systems typically experience heating due to the lack of energy conservation. Heating may be suppressed for time-periodic drives, but little is known for less regular drive protocols. In this paper, we investigate the heati…
View article: Prethermalization in periodically driven nonreciprocal many-body spin systems
Prethermalization in periodically driven nonreciprocal many-body spin systems Open
We analyze a new class of time-periodic nonreciprocal dynamics in interacting chaotic classical spin systems, whose equations of motion are conservative (phase-space-volume-preserving) yet possess no symplectic structure. As a result, the …
View article: Temporal disorder in spatiotemporal order
Temporal disorder in spatiotemporal order Open
Time-dependent driving holds the promise of realizing dynamical phenomena absent in static systems. Here, we introduce a correlated random driving protocol to realize a spatiotemporal order that cannot be achieved even by periodic driving,…
View article: Making Trotterization Adaptive and Energy-Self-Correcting for NISQ Devices and Beyond
Making Trotterization Adaptive and Energy-Self-Correcting for NISQ Devices and Beyond Open
Simulation of continuous-time evolution requires time discretization on both classical and quantum computers. A finer time step improves simulation precision but it inevitably leads to increased computational efforts. This is particularly …
View article: Adaptive Trotterization for time-dependent Hamiltonian quantum dynamics using piecewise conservation laws
Adaptive Trotterization for time-dependent Hamiltonian quantum dynamics using piecewise conservation laws Open
Digital quantum simulation relies on Trotterization to discretize time evolution into elementary quantum gates. On current quantum processors with notable gate imperfections, there is a critical tradeoff between improved accuracy for finer…
View article: Prethermalization in aperiodically kicked many-body dynamics
Prethermalization in aperiodically kicked many-body dynamics Open
Driven many-body systems typically experience heating due to the lack of energy conservation. Heating may be suppressed for time-periodic drives, but little is known for less regular drive protocols. In this work, we investigate the heatin…
View article: Report on 2211.16322v2
Report on 2211.16322v2 Open
We experimentally investigate the viability of a variational quantum gate optimization protocol informed by the underlying physical Hamiltonian of fixed-frequency transmon qubits.The utility of the scheme is demonstrated through the succes…
View article: Report on 2211.16322v2
Report on 2211.16322v2 Open
We experimentally investigate the viability of a variational quantum gate optimization protocol informed by the underlying physical Hamiltonian of fixed-frequency transmon qubits.The utility of the scheme is demonstrated through the succes…
View article: Temporal disorder in spatiotemporal order
Temporal disorder in spatiotemporal order Open
Time-dependent driving holds the promise of realizing dynamical phenomenon absent in static systems. Here, we introduce a correlated random driving protocol to realize a spatiotemporal order that cannot be achieved even by periodic driving…
View article: Variational Quantum Gate Optimization at the Pulse Level
Variational Quantum Gate Optimization at the Pulse Level Open
We experimentally investigate the viability of a variational quantum gate optimization protocol informed by the underlying physical Hamiltonian of fixed-frequency transmon qubits. The utility of the scheme is demonstrated through the succe…
View article: Making Trotterization adaptive and energy-self-correcting for NISQ devices and beyond
Making Trotterization adaptive and energy-self-correcting for NISQ devices and beyond Open
Simulation of continuous time evolution requires time discretization on both classical and quantum computers. A finer time step improves simulation precision, but it inevitably leads to increased computational efforts. This is particularly…
View article: Suppression of Interband Heating for Random Driving
Suppression of Interband Heating for Random Driving Open
Heating to high-lying states strongly limits the experimental observation of driving induced nonequilibrium phenomena, particularly when the drive has a broad spectrum. Here we show that, for entire families of structured random drives kno…
View article: Prethermalization in periodically-driven nonreciprocal many-body spin systems
Prethermalization in periodically-driven nonreciprocal many-body spin systems Open
We analyze a new class of time-periodic nonreciprocal dynamics in interacting chaotic classical spin systems, whose equations of motion are conservative (phase-space-volume-preserving) yet possess no symplectic structure. As a result, the …
View article: Anomalous random multipolar driven insulators
Anomalous random multipolar driven insulators Open
It is by now well established that periodically driven quantum many-body\nsystems can realize topological nonequilibrium phases without any equilibrium\ncounterpart. Here we show that, even in the absence of time translation\nsymmetry, non…
View article: Localization persisting under aperiodic driving
Localization persisting under aperiodic driving Open
Localization may survive in periodically driven (Floquet) quantum systems,\nbut is generally unstable for aperiodic drives. In this work, we identify a\nhidden conservation law originating from a chiral symmetry in a disordered\nspin-1/2 X…
View article: Enhancing Disorder-Free Localization through Dynamically Emergent Local Symmetries
Enhancing Disorder-Free Localization through Dynamically Emergent Local Symmetries Open
Disorder-free localization is a recently discovered phenomenon of\nnonergodicity that can emerge in quantum many-body systems hosting gauge\nsymmetries when the initial state is prepared in a superposition of gauge\nsuperselection sectors.…
View article: Confinement-induced impurity states in spin chains
Confinement-induced impurity states in spin chains Open
Quantum simulators hold the promise of probing central questions of high-energy physics in tunable condensed matter platforms, for instance the physics of confinement. Local defects can be an obstacle in these setups harming their simulati…