36 citations · 282 across the 29 of their papers we have counts for
29 papers
Grassmann time-evolving matrix product operators for fermionic impurities coupled to a superconducting bath
Chu Guo, Wei Wu, Xiansong Xu +4
The Grassmann time-evolving matrix product operator (GTEMPO) method, which represents the Feynman-Vernon influence functional as a temporal matrix product state, has been shown to…
Polaron Transformed Canonically Consistent Quantum Master Equation
Juzar Thingna, Xiansong Xu, Daniel Manzano
A central challenge in the theory of open quantum systems is the development of theoretical frameworks capable of accurately describing large, strongly interacting quantum many-bod…
Time-evolving matrix product operators for off-diagonal system-bath coupling
Chu Guo, Wei Wu, Xiansong Xu +3
The time-evolving matrix product operator (TEMPO) method has proven to be a powerful method to study the long-time dynamics of bosonic impurity problems where a small system is lin…
Continuous-time parametrization of neural quantum states for quantum dynamics
Dingzu Wang, Wenxuan Zhang, Xiansong Xu +1
Neural quantum states are a promising framework for simulating many-body quantum dynamics, as they can represent states with volume-law entanglement. As time evolves, the neural ne…
Emergence of steady quantum transport in a superconducting processor
Pengfei Zhang, Yu Gao, Xiansong Xu +29
Non-equilibrium quantum transport is crucial to technological advances ranging from nanoelectronics to thermal management. In essence, it deals with the coherent transfer of energy…
Grassmann time-evolving matrix product operators: An efficient numerical approach for fermionic path integral simulations
Xiansong Xu, Chu Guo, Ruofan Chen
Developing numerical exact solvers for open quantum systems is a challenging task due to the non-perturbative and non-Markovian nature when coupling to structured environments. The…
Paths towards time evolution with larger neural-network quantum states
Wenxuan Zhang, Bo Xing, Xiansong Xu +1
In recent years, the neural-network quantum states method has been investigated to study the ground state and the time evolution of many-body quantum systems. Here we expand on the…
Hydrodynamics and the eigenstate thermalization hypothesis
Luca Capizzi, Jiaozi Wang, Xiansong Xu +2
The eigenstate thermalization hypothesis (ETH) describes the properties of diagonal and off-diagonal matrix elements of local operators in the eigenenergy basis. In this work, we p…
Real-time Impurity Solver Using Grassmann Time-Evolving Matrix Product Operators
Ruofan Chen, Xiansong Xu, Chu Guo
An emergent and promising tensor-network-based impurity solver is to represent the path integral as a matrix product state, where the bath is analytically integrated out using Feyn…
Grassmann Time-Evolving Matrix Product Operators for Equilibrium Quantum Impurity Problems
Ruofan Chen, Xiansong Xu, Chu Guo
Tensor-network-based methods are promising candidates to solve quantum impurity problems. They are free of sampling noises and the sign problem compared to state-of-the-art continu…
Grassmann Time-Evolving Matrix Product Operators for Quantum Impurity Models
Ruofan Chen, Xiansong Xu, Chu Guo
The time-evolving matrix product operators (TEMPO) method, which makes full use of the Feynman-Vernon influence functional, is the state-of-the-art tensor network method for bosoni…
Simulating quantum transport via collisional models on a digital quantum computer
Rebecca Erbanni, Xiansong Xu, Tommaso Demarie +1
Digital quantum computers have the potential to study the dynamics of complex quantum systems. Nonequilibrium open quantum systems are, however, less straightforward to be implemen…
A real neural network state for quantum chemistry
Yangjun Wu, Xiansong Xu, Dario Poletti +3
The restricted Boltzmann machine (RBM) has been successfully applied to solve the many-electron Schrdinger equation. In this work we propose a single-layer fully c…
Efficacy of noisy dynamical decoupling
Jiaan Qi, Xiansong Xu, Dario Poletti +1
Dynamical decoupling (DD) refers to a well-established family of methods for error mitigation, comprising pulse sequences aimed at averaging away slowly evolving noise in quantum s…
Ground state search by local and sequential updates of neural network quantum states
Wenxuan Zhang, Xiansong Xu, Zheyu Wu +2
Neural network quantum states are a promising tool to analyze complex quantum systems given their representative power. It can however be difficult to optimize efficiently and effe…
Non-Markovian effects in stochastic resonance in a two level system
Ruofan Chen, Xiansong Xu
Stochastic resonance is a phenomenon where the response signal to external driving is enhanced by environment noise. In quantum regime, the effect of environment is often intrinsic…
Emergence of steady currents due to strong prethermalization
Xiansong Xu, Chu Guo, Dario Poletti
A steady current between baths is a manifestation of the prethermalization phenomenon, a quasi-equilibrium dynamical process with weak conserved quantity breaking. We consider two…
Typicality of nonequilibrium (quasi-)steady currents
Xiansong Xu, Chu Guo, Dario Poletti
The understanding of the emergence of equilibrium statistical mechanics has progressed significantly thanks to developments from typicality, canonical and dynamical, and from the e…
Thermopower in a boundary driven bosonic ladder in the presence of a gauge field
Bo Xing, Xiansong Xu, Vinitha Balachandran +1
We consider a bosonic two-legged ladder whose two-band energy spectrum can be tuned in the presence of a uniform gauge field, to four distinct scenarios: degenerate or non-degenera…
Localization-delocalization effects of a delocalizing dissipation on disordered XXZ spin chains
Xiansong Xu, Dario Poletti
The interplay between interaction, disorder, and dissipation has shown a rich phenomenology. Here we investigate a disordered XXZ spin chain in contact with a bath which, alone, wo…
Heat, particle and chiral currents in a boundary driven bosonic ladders in presence of gauge fields
Bo Xing, Xiansong Xu, Vinitha Balachandran +1
Quantum systems can undergo phase transitions and show distinct features in different phases. The corresponding transport properties can also vary significantly due to the underlyi…
Magnon-magnon interaction and magnon relaxation time in ferromagnetic Cr2Ge2Te6 monolayer
Ke Wang, Xiansong Xu, Yuan Cheng +4
Despite the intense amount of attention and huge potential of two-dimensional (2D) magnets for applications in novel magnetic, magneto-optical, magneto-thermal and magneto-electron…
Interaction-impeded relaxation in the presence of finite temperature baths
Ryan Tan, Xiansong Xu, Dario Poletti
We study the interplay between interactions and finite-temperature dephasing baths. We consider a double well with strongly interacting bosons coupled, via the density, to a bosoni…
Dissipative features of the driven spin-fermion system
Ruofan Chen, Xiansong Xu
We study a generic spin-fermion model, where a two-level system (spin) is coupled to two metallic leads with different chemical potentials, in the presence of monochromatic driving…