55 citations · 598 across the 48 of their papers we have counts for
26 papers · 1 filter
Preferred basis derived from eigenstate thermalization hypothesis
Hua Yan, Jiaozi Wang, Wen-ge Wang
We study the long-time average of the reduced density matrix (RDM) of an -level central system, which is locally coupled to a large environment, under an overall Schrödinger evo…
Quantum Chaos and the Correspondence Principle
Jiaozi Wang, Giuliano Benenti, Giulio Casati +1
The correspondence principle is a cornerstone in the entire construction of quantum mechanics. This principle has been recently challenged by the observation of an early-time expon…
Closeness of the reduced density matrix of an interacting small system to the Gibbs state
Wen-ge Wang
I study the statistical description of a small quantum system, which is coupled to a large quantum environment in a generic form and with a generic interaction strength, when the t…
Complexity of quantum motion and quantum-classical correspondence: A phase-space approach
Jiaozi Wang, Giuliano Benenti, Giulio Casati +1
We discuss the connection between the out-of-time-ordered correlator and the number of harmonics of the phase-space Wigner distribution function. In particular, we show that both q…
Steady-state relations for a two-level system locally and relatively-strongly coupled to a generic many-body quantum chaotic environment
Hua Yan, Jiaozi Wang, Wen-ge Wang
We study the long-time average of the reduced density matrix (RDM) of a two-level system as the central system, which is locally coupled to a generic many-body quantum chaotic syst…
Convergent perturbation expansion of energy eigenfunctions on unperturbed basis states in classically-forbidden regions
Jiaozi Wang, Wen-ge Wang
We study properties of eigenfunctions of perturbed systems, given on the eigenbases of unperturbed, integrable systems. For a given pair of perturbed and unperturbed systems, with…
A decoherence interpretation of quantum work for adiabatic processes
Wen-ge Wang
In this paper, decoherence is studied for quantum systems undergoing adiabatic processes, which are coupled to huge quantum environments. It is shown that decoherence can happen wi…
Correlations in eigenfunctions of quantum chaotic systems with sparse Hamiltonian matrices
Jiaozi Wang, Wen-ge Wang
In most realistic models for quantum chaotic systems, the Hamiltonian matrices in unperturbed bases have a sparse structure. We study correlations in eigenfunctions of such systems…
Statistical distribution of components of energy eigenfunctions: from nearly-integrable to chaotic
Jiaozi Wang, Wen-ge Wang
We study the statistical distribution of components in the non-perturbative parts of energy eigenfunctions (EFs), in which main bodies of the EFs lie. Our numerical simulations in…
Half-width of local spectral density of states given by width of nonperturbative parts of eigenfunctions: The Wigner-band-matrix model
Yijian Zou, Yuchen Ma, Peijun Zhu +2
It is shown that, for a Hamiltonian with a band structure, the half width of local spectral density of states, or strength function, is closely related to the width of the nonpertu…
Complexity and instability of quantum motion near a quantum phase transition
Pinquan Qin, Wen-ge Wang, Giuliano Benenti +1
We show that the number of harmonics of the Wigner function, recently proposed as a measure of quantum complexity, can be also used to characterize quantum phase transitions. The n…
Statistically preferred basis of an open quantum system: Its relation to the eigenbasis of a renormalized self-Hamiltonian
Lewei He, Wen-ge Wang
We study the problem of the basis of an open quantum system, under a quantum chaotic environment, which is preferred in view of its stationary reduced density matrix (RDM), that is…
Semiclassical approach to the quantum Loschmidt echo in deep quantum regions: from validity to breakdown
Pinquan Qin, Qian Wang, Wen-ge Wang
Semiclassical results are usually expected to be valid in the semiclassical regime. An interesting question is, in models in which appropriate effective Planck constants can be int…
Statistical description of small quantum systems beyond weak-coupling limit
Wen-ge Wang
An explicit expression is derived for the statistical description of small quantum systems, which are relatively-weakly and directly coupled to only small parts of their environmen…
Scaling behavior for a class of quantum phase transitions
Wen-ge Wang, Pinquan Qin, Qian Wang +2
We show that for quantum phase transitions with a single bosonic zero mode at the critical point, like the Dicke model and the Lipkin-Meshkov-Glick model, metric quantities such as…
Preferred States of Decoherence under Intermediate System-Environment Coupling
Wen-ge Wang, Lewei He, Jiangbin Gong
The notion that decoherence rapidly reduces a superposition state to an incoherent mixture implicitly adopts a special representation, namely, the representation of preferred (poin…
Efficiency of dynamical decoupling sequences in presence of pulse errors
Zhihao Xiao, Lewei He, Wen-ge Wang
For a generic dynamical decoupling sequence employing a single-axis control, we study its efficiency in the presence of small errors in direction of the controlling-pulses. In the…
Quantum theory for a total system including one internal measuring apparatus
Wen-ge Wang
In this paper, we extend the standard formalism of quantum mechanics to a quantum theory for a total system including one internal measuring apparatus. The internality of the measu…
Semiclassical Approach to Survival Probability at Quantum Phase Transitions
Wen-ge Wang, Pinquan Qin, Lewei He +1
We study the decay of survival probability at quantum phase transitions (QPT). The semiclassical theory is found applicable in the vicinities of critical points with infinite degen…
A quantum theory for a total system including a reference system
Wen-ge Wang
The standard formalism of quantum mechanics is extended to describe a total system including the reference system (RS), with respect to which the total system is described. The RS…
Stability of Fock states in a two-component Bose-Einstein condensate with a regular classical counterpart
Wen-ge Wang, Jie Liu, Baowen Li
We study the stability of a two-component Bose-Einstein condensate (BEC) in the parameter regime in which its classical counterpart has regular motion. The stability is characteriz…
Entanglement-induced Decoherence and Energy Eigenstates
Wen-ge Wang, Jiangbin Gong, G. Casati +1
Using recent results in the field of quantum chaos we derive explicit expressions for the time scale of decoherence induced by the system-environment entanglement. For a generic sy…
Entanglement and Disentanglement, Probabilistic Interpretation of Statevectors, and Transformation between Intrinsic Frames of Reference
Wen-ge Wang
We study a quantum theory based on two assumptions: In the intrinsic frame of reference of an isolated, macroscopic system, (i) the system has no global motion and is not entangled…
Stability of quantum motion in regular systems: a uniform semiclassical approach
Wen-ge Wang, G. Casati, Baowen Li
We study the stability of quantum motion of classically regular systems in presence of small perturbations. Onthe base of a uniform semiclassical theory we derive the fidelity deca…