456 citations · 3.3k across the 66 of their papers we have counts for
7 papers · 1 filter
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…