Efficient method for quantum impurity problems out of equilibrium

J Thoenniss, M Sonner, A Lerose, DA Abanin - Physical Review B, 2023 - APS
We introduce an efficient method to simulate the dynamics of an interacting quantum
impurity coupled to noninteracting fermionic reservoirs. Viewing the impurity as an open …

Nonequilibrium quantum impurity problems via matrix-product states in the temporal domain

J Thoenniss, A Lerose, DA Abanin - Physical Review B, 2023 - APS
Describing a quantum impurity coupled to one or more noninteracting fermionic reservoirs is
a paradigmatic problem in quantum many-body physics. While historically the focus has …

Exact Non-Markovian Quantum Dynamics on the NISQ Device Using Kraus Operators

A Seneviratne, PL Walters, F Wang - ACS omega, 2024 - ACS Publications
The theory of open quantum systems has many applications ranging from simulating
quantum dynamics in condensed phases to better understanding quantum-enabled …

A multisite decomposition of the tensor network path integrals

A Bose, PL Walters - The Journal of Chemical Physics, 2022 - pubs.aip.org
Tensor network decompositions of path integrals for simulating open quantum systems have
recently been proven to be useful. However, these methods scale exponentially with the …

Numerical evaluation and robustness of the quantum mean-force Gibbs state

YF Chiu, A Strathearn, J Keeling - Physical Review A, 2022 - APS
We introduce a numerical method to determine the Hamiltonian of mean force (HMF) Gibbs
state for a quantum system strongly coupled to a reservoir. The method adapts the time …

Tensor network path integral study of dynamics in B850 LH2 ring with atomistically derived vibrations

A Bose, PL Walters - Journal of Chemical Theory and …, 2022 - ACS Publications
The recently introduced multisite tensor network path integral (MS-TNPI) allows simulation of
extended quantum systems coupled to dissipative media. We use MS-TNPI to simulate the …

Impact of solvent on state-to-state population transport in multistate systems using coherences

A Bose, PL Walters - Journal of Chemical Theory and …, 2023 - ACS Publications
Understanding the pathways taken by a quantum particle during a transport process is an
enormous challenge. There are broadly two different aspects of the problem that affect the …

Quantum correlation functions through tensor network path integral

A Bose - The Journal of Chemical Physics, 2023 - pubs.aip.org
Tensor networks have historically proven to be of great utility in providing compressed
representations of wave functions that can be used for the calculation of eigenstates …

Impact of Loss Mechanisms on Linear Spectra of Excitonic and Polaritonic Aggregates

D Sharma, A Bose - Journal of Chemical Theory and Computation, 2024 - ACS Publications
The presence of loss mechanisms governed by empirical timescales can profoundly affect
the dynamics in molecular systems, leading to changes in their spectra. However …

QuantumDynamics. jl: A modular approach to simulations of dynamics of open quantum systems

A Bose - The Journal of Chemical Physics, 2023 - pubs.aip.org
A simulation of the non-adiabatic dynamics of a quantum system coupled to dissipative
environments poses significant challenges. New sophisticated methods are regularly being …