A new perturbative approach to the study of quantum systems at finite temperature

1990 ◽  
Vol 105 (5) ◽  
pp. 525-572
Author(s):  
A. Riccardi
Keyword(s):  
Finite Temperature ◽  
Quantum Systems ◽  
Perturbative Approach

scholarly journals Matrix Product State Simulations of Non-Equilibrium Steady States and Transient Heat Flows in the Two-Bath Spin-Boson Model at Finite Temperatures

Entropy ◽  
2021 ◽  
Vol 23 (1) ◽  
pp. 77
Author(s):  
Angus J. Dunnett ◽  
Alex W. Chin
Keyword(s):  
Finite Temperature ◽  
Open Quantum Systems ◽  
Quantum Systems ◽  
Steady States ◽  
Matrix Product ◽  
Open Quantum ◽  
Matrix Product State ◽  
Wide Range ◽  
Boson Model ◽  
Non Equilibrium

Simulating the non-perturbative and non-Markovian dynamics of open quantum systems is a very challenging many body problem, due to the need to evolve both the system and its environments on an equal footing. Tensor network and matrix product states (MPS) have emerged as powerful tools for open system models, but the numerical resources required to treat finite-temperature environments grow extremely rapidly and limit their applications. In this study we use time-dependent variational evolution of MPS to explore the striking theory of Tamascelli et al. (Phys. Rev. Lett. 2019, 123, 090402.) that shows how finite-temperature open dynamics can be obtained from zero temperature, i.e., pure wave function, simulations. Using this approach, we produce a benchmark dataset for the dynamics of the Ohmic spin-boson model across a wide range of coupling strengths and temperatures, and also present a detailed analysis of the numerical costs of simulating non-equilibrium steady states, such as those emerging from the non-perturbative coupling of a qubit to baths at different temperatures. Despite ever-growing resource requirements, we find that converged non-perturbative results can be obtained, and we discuss a number of recent ideas and numerical techniques that should allow wide application of MPS to complex open quantum systems.

scholarly journals Efficient Simulation of Finite-Temperature Open Quantum Systems

2019 ◽  
Vol 123 (9) ◽  
Author(s):  
D. Tamascelli ◽  
A. Smirne ◽  
J. Lim ◽  
S. F. Huelga ◽  
M. B. Plenio
Keyword(s):  
Finite Temperature ◽  
Open Quantum Systems ◽  
Quantum Systems ◽  
Open Quantum ◽  
Efficient Simulation

scholarly journals Perturbative approach to Markovian open quantum systems

2014 ◽  
Vol 4 (1) ◽  
Author(s):  
Andy C. Y. Li ◽  
F. Petruccione ◽  
Jens Koch
Keyword(s):  
Open Quantum Systems ◽  
Quantum Systems ◽  
Perturbative Approach ◽  
Open Quantum
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