456 citations · 3.3k across the 66 of their papers we have counts for
66 papers
Signature of Scramblon Effective Field Theory in Random Spin Models
Zeyu Liu, Pengfei Zhang
Information scrambling refers to the propagation of information throughout a quantum system. Its study not only contributes to our understanding of thermalization but also has wide…
Perturbative Page Curve Induced by External Impulse
Pengfei Zhang
In this work, we extend the recent study of entropy dynamics induced by an external impulse in open quantum systems, where the entropy response follows the Page curve. For small sy…
Quantum phases of -orbital bosonic gases in a hexagonal lattice
Pengfei Zhang, Hui Tan, Jianmin Yuan +1
Orbital degree of freedom plays an important role for understanding quantum many-body phenomena. In this work, we study an experimentally related setup with ultracold bosons loaded…
Universal Aspects of High-Temperature Relaxation Dynamics in Random Spin Models
Tian-Gang Zhou, Wei Zheng, Pengfei Zhang
Universality is a crucial concept in modern physics, allowing us to capture the essential features of a system's behavior using a small set of parameters. In this work, we unveil u…
Universal Properties of the Spectral Form Factor in Open Quantum Systems
Yi-Neng Zhou, Tian-Gang Zhou, Pengfei Zhang
The spectral form factor (SFF) can probe the eigenvalue statistic at different energy scales as its time variable varies. In closed quantum chaotic systems, the SFF exhibits a univ…
Attenuating Dynamics of Strongly Interacting Fermionic Superfluids in SYK Solvable Models
Tian-Gang Zhou, Pengfei Zhang
Quench dynamics of fermionic superfluids are an active topic both experimentally and theoretically. Using the BCS theory, such non-equilibrium problems can be reduced to nearly ind…
Full Counting Statistics across the Entanglement Phase Transition of Non-Hermitian Hamiltonians with Charge Conservations
Tian-Gang Zhou, Yi-Neng Zhou, Pengfei Zhang
Performing quantum measurements produces not only the expectation value of a physical observable but also the probability distribution of all possible outcomes . The…
Dynamical Transition of Operator Size Growth in Quantum Systems Embedded in an Environment
Pengfei Zhang, Zhenhua Yu
In closed generic many-body systems, unitary evolution disperses local quantum information into highly non-local objects, resulting in thermalization. Such a process is called info…
Quantized Topological Response in Trapped Quantum Gases
Pengfei Zhang
In this letter, we propose a quantized topological response in trapped 1D quantum gases. The experimental protocol for the response requires the application of an instant optical p…
Proposal for stable atom trapping on a GaN-on-Sapphire chip
Aiping Liu, Lei Xu, Xin-Biao Xu +6
The hybrid photon-atom integrated circuits, which include photonic microcavities and trapped single neutral atom in their evanescent field, are of great potential for quantum infor…
Quantum Entanglement in the Sachdev-Ye-Kitaev Model and its Generalizations
Pengfei Zhang
Entanglement is one of the most important concepts in quantum physics. We review recent progress in understanding the quantum entanglement in many-body systems using large- solv…
A two-way approach to out-of-time-order correlators
Yingfei Gu, Alexei Kitaev, Pengfei Zhang
Out-of-time-order correlators (OTOCs) are a standard measure of quantum chaos. Of the four operators involved, one pair may be regarded as a source and the other as a probe. A usua…
Synthesizing five-body interaction in a superconducting quantum circuit
Ke Zhang, Hekang Li, Pengfei Zhang +10
Synthesizing many-body interaction Hamiltonian is a central task in quantum simulation. However, it is challenging to synthesize interactions including more than two spins. Borrowi…
Violation and Revival of Kramers' Degeneracy in Open Quantum Systems
Pengfei Zhang, Yu Chen
Kramers' theorem ensures double degeneracy in the energy spectrum of a time-reversal symmetric fermionic system with half-integer total spin. Here we are now trying to go beyond th…
Space-Time Duality between Quantum Chaos and Non-Hermitian Boundary Effect
Tian-Gang Zhou, Yi-Neng Zhou, Pengfei Zhang +1
Quantum chaos in hermitian systems concerns the sensitivity of long-time dynamical evolution to initial conditions. The skin effect discovered recently in non-hermitian systems rev…
Boundary Condition Independence of Non-Hermitian Hamiltonian Dynamics
Liang Mao, Tianshu Deng, Pengfei Zhang
Non-Hermitian skin effect, namely that the eigenvalues and eigenstates of a non-Hermitian tight-binding Hamiltonian have significant differences under open or periodic boundary con…
Page Curve from Non-Markovianity
Kaixiang Su, Pengfei Zhang, Hui Zhai
In this letter, we use the exactly solvable Sachdev-Ye-Kitaev model to address the issue of entropy dynamics when an interacting quantum system is coupled to a non-Markovian enviro…
Expressivity of Quantum Neural Networks
Yadong Wu, Juan Yao, Pengfei Zhang +1
In this work, we address the question whether a sufficiently deep quantum neural network can approximate a target function as accurate as possible. We start with simple but typical…
An obstacle to sub-AdS holography for SYK-like models
Pengfei Zhang, Yingfei Gu, Alexei Kitaev
We argue that "stringy" effects in a putative gravity-dual picture for SYK-like models are related to the branching time, a kinetic coefficient defined in terms of the retarded ker…
Stark many-body localization on a superconducting quantum processor
Qiujiang Guo, Chen Cheng, Hekang Li +9
Quantum emulators, owing to their large degree of tunability and control, allow the observation of fine aspects of closed quantum many-body systems, as either the regime where ther…
More on Complex Sachdev-Ye-Kitaev Eternal Wormholes
Pengfei Zhang
In this work, we study a generalization of the coupled Sachdev-Ye-Kitaev (SYK) model with charge conservations. The model contains two copies of the complex SYK model at dif…
Scrambling Ability of Quantum Neural Networks Architectures
Yadong Wu, Pengfei Zhang, Hui Zhai
In this letter we propose a general principle for how to build up a quantum neural network with high learning efficiency. Our stratagem is based on the equivalence between extracti…
Floquet Engineering of a Dynamical Lattice Gauge Field with Ultracold Atoms
Wei Zheng, Pengfei Zhang
In this paper, we propose that a simple model, in which fermions coupled to a dynamical lattice gauge field, can be engineered via the Floquet approach. The model possess both a in…
Tunneling through an Eternal Traversable Wormhole
Tian-Gang Zhou, Pengfei Zhang
The Maldacena-Qi model describes two copies of the Sachdev-Ye-Kitaev model coupled with an additional coupling, and is dual to the Jackiw-Teitelboim gravity which exhibits an etern…