13 citations · 51 across the 18 of their papers we have counts for
20 papers
Exact replica-sector hierarchy of multi-resolvent correlations in random free fermions
Zhiqiang Huang
The spectral weight with which a many-body eigenstate contributes to a given channel is not fixed by the smooth one-point ETH envelope, and its higher-order correlations---the conn…
Beyond the ETH envelope: exact two-resolvent fluctuation structure, projected microscopic closure, and rigid versus nonperturbative sectors
Zhiqiang Huang
Eigenstate thermalization fixes the smooth energy-resolved envelope of few-body observables but not the microscopic overlap statistics that realize it. In the multi-resolvent hiera…
Information-geometric bounds on nonequilibrium relaxation in quantum Markov dynamics
Xiao-Kan Guo, Zhiqiang Huang
In this paper, we study the quantum information-geometric structure underlying short-time nonequilibrium relaxation in quantum Markov dynamics, and derive bounds on the nonequilibr…
A Multi-Resolvent Hierarchy for the ETH Smooth Function
Zhiqiang Huang
The eigenstate thermalization hypothesis (ETH) parametrizes off-diagonal matrix elements by a smooth function whose microscopic origin remains largely phenomenological. We develop…
Resolvent-Based Self-Consistent Framework with Hierarchical Correlation Expansion for Strongly Correlated Many-Body Systems
Zhi-qiang Huang, Qing-yu Cai
We develop a nonperturbative framework for generic nonintegrable many-body systems that reorganizes the expansion of diagonal Green's functions. Starting from exact projection iden…
On the generic increase of entropy in isolated systems
Zhiqiang Huang, Qing-yu Cai
We investigate the generic emergence of entropy in isolated quantum systems from the spectral structure of their long-time dephased states. Using a resolvent-based hierarchy, we se…
Trade-off between diagonal and off-diagonal elements in the eigenstate thermalization hypothesis
Zhiqiang Huang
To bypass the reliance on local observables in verifying the eigenstate thermalization hypothesis (ETH), we introduce an observable-independent measure of distinguishability based…
Subsystem eigenstate thermalization hypothesis for translation invariant systems
Zhiqiang Huang, Xiao-Kan Guo
The eigenstate thermalization hypothesis for translation invariant quantum spin systems has been proved recently by using random matrices. In this paper, we study the subsystem ver…
Integral fluctuation theorems and trace-preserving map
Zhiqiang Huang
The detailed fluctuation theorem implies symmetry in the generating function of entropy production probability. The integral fluctuation theorem directly follows from this symmetry…
Multiple entropy production for multitime quantum processes
Zhiqiang Huang
Entropy production and the detailed fluctuation theorem are of fundamental importance for thermodynamic processes. In this paper, we study the multiple entropy production for multi…
Leggett-Garg inequalities for multitime processes
Zhiqiang Huang, Xiao-Kan Guo
We study some aspects of the Leggett-Garg inequalities by using the operator-state formalism for multitime processes. The process tensor in its Choi-state form, which we call proce…
On the relation between quantum Darwinism and approximate quantum Markovianity
Xiao-Kan Guo, Zhiqiang Huang
There are strong evidences in the literature that quantum non-Markovianity would hinder the presence of Quantum Darwinism. In this Letter, we study the relation between quantum Dar…
Classical and quantum parts of conditional mutual information for open quantum systems
Zhiqiang Huang, Xiao-Kan Guo
We study the classical, classical-quantum, and quantum parts of conditional mutual information in the ``system-environment-ancilla'' setting of open quantum systems. We perform the…
Fluctuation Theorems for multitime processes
Zhiqiang Huang
In this paper, we extend the fluctuation theorems used for quantum channels to multitime processes. The fluctuation theorems for quantum channels are less restrictive. We show that…
Quantifying non-Markovianity via conditional mutual information
Zhiqiang Huang, Xiao-Kan Guo
In this paper, we study measures of quantum non-Markovianity based on the conditional mutual information. We obtain such measures by considering multiple parts of the total environ…
Non-Markovian quantum dynamics: Extended correlated projection superoperators
Zhiqiang Huang
The correlated projection superoperator techniques provide a better understanding about how correlations lead to strong non-Markovian effects in open quantum systems. Their superop…
N-Z equation from assignment maps
Zhiqiang Huang
The Nakajima-Zwanzig(N-Z) equation is a powerful tool to analyze the open quantum system and non-Markovian behavior. In this paper, we modify the N-Z equation with assignment maps.…
Lieb-Robinson Bound at Finite Temperature
Zhiqiang Huang, Xiao-Kan Guo
The Lieb-Robinson bound shows that the speed of propagating information in a nonrelativistic quantum lattice system is bounded by a finite velocity, which entails the clustering of…
Gravitational baryogenesis of vacuum Inflation
Zhiqiang Huang, Qing-yu Cai
We show that in the vacuum inflation model, the gravitational baryogenesis mechanism will produce the baryon asymmetry. We analyze the evolution of entropy and baryon number in the…
Scalar and tensor perturbation in vacuum inflation
Zhiqiang Huang, Dongfeng Gao, Qing-yu Cai
Recently, it was proposed that a small true vacuum universe can inflate spontaneously, in principle. Furthermore, there should be matter creation in vacuum inflation due to quantum…