1.8k citations · 5k across the 29 of their papers we have counts for
29 papers
Alternating quantum-emitter chains: Exceptional-point phase transition, edge state, and quantum walks
Jimin Li, Zongping Gong
We study the long-range hopping limit of a one-dimensional array of equal-distanced quantum emitters in free space, where the hopping amplitude of emitter excitation is proport…
Hermitian and Non-Hermitian Topology from Photon-Mediated Interactions
Federico Roccati, Miguel Bello, Zongping Gong +4
Light can mediate effective dipole-dipole interactions between atoms or quantum emitters coupled to a common environment. Exploiting them to tailor a desired effective Hamiltonian…
Long-Range Free Fermions: Lieb-Robinson Bound, Clustering Properties, and Topological Phases
Zongping Gong, Tommaso Guaita, J. Ignacio Cirac
We consider free fermions living on lattices in arbitrary dimensions, where hopping amplitudes follow a power-law decay with respect to the distance. We focus on the regime where t…
Free-fermion Page Curve: Canonical Typicality and Dynamical Emergence
Xie-Hang Yu, Zongping Gong, J. Ignacio Cirac
We provide further analytical insights into the newly established noninteracting (free-fermion) Page curve, focusing on both the kinematic and dynamical aspects. First, we unveil t…
Bound states and photon emission in non-Hermitian nanophotonics
Zongping Gong, Miguel Bello, Daniel Malz +1
We establish a general framework for studying the bound states and the photon-emission dynamics of quantum emitters coupled to structured nanophotonic lattices with engineered diss…
Anomalous Behaviors of Quantum Emitters in Non-Hermitian Baths
Zongping Gong, Miguel Bello, Daniel Malz +1
Both non-Hermitian systems and the behaviour of emitters coupled to structured baths have been studied intensely in recent years. Here we study the interplay of these paradigmatic…
Bounds in Nonequilibrium Quantum Dynamics
Zongping Gong, Ryusuke Hamazaki
We review various bounds concerning out-of-equilibrium dynamics in few-level and many-body quantum systems. We primarily focus on closed quantum systems but will also mention some…
Supersymmetric Free Fermions and Bosons: Locality, Symmetry and Topology
Zongping Gong, Robert H. Jonsson, Daniel Malz
Supersymmetry, originally proposed in particle physics, refers to a dual relation that connects fermionic and bosonic degrees of freedom in a system. Recently, there has been consi…
Coarse-grained Entanglement and Operator Growth in Anomalous Dynamics
Zongping Gong, Adam Nahum, Lorenzo Piroli
In two-dimensional Floquet systems, many-body localized dynamics in the bulk may give rise to a chaotic evolution at the one-dimensional edges that is characterized by a nonzero ch…
Topology of Quantum Gaussian States and Operations
Zongping Gong, Tommaso Guaita
As is well-known in the context of topological insulators and superconductors, short-range-correlated fermionic pure Gaussian states with fundamental symmetries are systematically…
Topological lower bound on quantum chaos by entanglement growth
Zongping Gong, Lorenzo Piroli, J. Ignacio Cirac
A fundamental result in modern quantum chaos theory is the Maldacena-Shenker-Stanford upper bound on the growth of out-of-time-order correlators, whose infinite-temperature limit i…
Non-Hermitian Physics
Yuto Ashida, Zongping Gong, Masahito Ueda
A review is given on the foundations and applications of non-Hermitian classical and quantum physics. First, key theorems and central concepts in non-Hermitian linear algebra, incl…
Error bounds for constrained dynamics in gapped quantum systems: Rigorous results and generalizations
Zongping Gong, Nobuyuki Yoshioka, Naoyuki Shibata +1
In arXiv:2001.03419 we introduce a universal error bound for constrained unitary dynamics within a well-gapped energy band of an isolated quantum system. Here, we provide the full…
Universal Error Bound for Constrained Quantum Dynamics
Zongping Gong, Nobuyuki Yoshioka, Naoyuki Shibata +1
It is well known in quantum mechanics that a large energy gap between a Hilbert subspace of specific interest and the remainder of the spectrum can suppress transitions from the qu…
Thermodynamic Uncertainty Relation for Arbitrary Initial States
Kangqiao Liu, Zongping Gong, Masahito Ueda
The thermodynamic uncertainty relation (TUR) describes a trade-off relation between nonequilibrium currents and entropy production and serves as a fundamental principle of nonequil…
Lieb-Robinson Bounds on Entanglement Gaps from Symmetry-Protected Topology
Zongping Gong, Naoto Kura, Masatoshi Sato +1
A quantum quench is the simplest protocol to investigate nonequilibrium many-body quantum dynamics. Previous studies on the entanglement properties of quenched quantum many-body sy…
Second-Order Topological Phases in Non-Hermitian Systems
Tao Liu, Yu-Ran Zhang, Qing Ai +4
A -dimensional second-order topological insulator (SOTI) can host topologically protected -dimensional gapless boundary modes. Here we show that a 2D non-Hermitian SOTI…
Topological unification of time-reversal and particle-hole symmetries in non-Hermitian physics
Kohei Kawabata, Sho Higashikawa, Zongping Gong +2
Topological phases are enriched in non-equilibrium open systems effectively described by non-Hermitian Hamiltonians. While several properties unique to non-Hermitian topological sy…
Topological phases of non-Hermitian systems
Zongping Gong, Yuto Ashida, Kohei Kawabata +3
Recent experimental advances in controlling dissipation have brought about unprecedented flexibility in engineering non-Hermitian Hamiltonians in open classical and quantum systems…
Topological Entanglement-Spectrum Crossing in Quench Dynamics
Zongping Gong, Masahito Ueda
We unveil the stable -dimensional topological structures underlying the quench dynamics for all the Altland-Zirnbauer classes in dimension, and propose to detect such…
Verification of the Quantum Nonequilibrium Work Relation in the Presence of Decoherence
Andrew Smith, Yao Lu, Shuoming An +6
Although nonequilibrium work and fluctuation relations have been studied in detail within classical statistical physics, extending these results to open quantum systems has proven…
Discrete Time-Crystalline Order in Cavity and Circuit QED Systems
Zongping Gong, Ryusuke Hamazaki, Masahito Ueda
Discrete time crystals are a recently proposed and experimentally observed out-of-equilibrium dynamical phase of Floquet systems, where the stroboscopic evolution of a local observ…
Fluctuation theorems in feedback-controlled open quantum systems: quantum coherence and absolute irreversibility
Yûto Murashita, Zongping Gong, Yuto Ashida +1
Thermodynamics of quantum coherence has attracted growing attention recently, where the thermodynamic advantage of quantum superposition is characterized in terms of quantum thermo…
Zeno Hall Effect
Zongping Gong, Sho Higashikawa, Masahito Ueda
We show that the quantum Zeno effect gives rise to the Hall effect by tailoring the Hilbert space of a two-dimensional lattice system into a single Bloch band with a nontrivial Ber…