OQuPy: A Python package to efficiently simulate non-Markovian open quantum systems with process tensors
Non-Markovian dynamics arising from the strong coupling of a system to a structured
environment is essential in many applications of quantum mechanics and emerging …
environment is essential in many applications of quantum mechanics and emerging …
Tensor network influence functionals in the continuous-time limit: Connections to quantum embedding, bath discretization, and higher-order time propagation
We describe two developments of tensor network influence functionals [in particular,
influence functional matrix product states (IF-MPS)] for quantum impurity dynamics within the …
influence functional matrix product states (IF-MPS)] for quantum impurity dynamics within the …
Real-time impurity solver using Grassmann time-evolving matrix product operators
R Chen, X Xu, C Guo - Physical Review B, 2024 - APS
An emergent and promising tensor-network-based impurity solver is to represent the
Feynman-Vernon influence functional as a matrix product state, where the bath is integrated …
Feynman-Vernon influence functional as a matrix product state, where the bath is integrated …
Solving equilibrium quantum impurity problems on the L-shaped Kadanoff-Baym contour
R Chen, C Guo - Physical Review B, 2024 - APS
The path integral formalism is the building block of many powerful numerical methods for
quantum impurity problems. However, existing fermionic path integral-based numerical …
quantum impurity problems. However, existing fermionic path integral-based numerical …
Grassmann time-evolving matrix product operators for equilibrium quantum impurity problems
R Chen, X Xu, C Guo - New Journal of Physics, 2024 - iopscience.iop.org
Tensor-network-based methods are promising candidates to solve quantum impurity
problems (QIP). They are free of sampling noises and the sign problem compared to state-of …
problems (QIP). They are free of sampling noises and the sign problem compared to state-of …
Infinite Grassmann time-evolving matrix product operator method for zero-temperature equilibrium quantum impurity problems
C Guo, R Chen - Physical Review B, 2024 - APS
The Grassmann time-evolving matrix product operator (GTEMPO) method has proven to be
an accurate and efficient numerical method for the real-time dynamics of quantum impurity …
an accurate and efficient numerical method for the real-time dynamics of quantum impurity …
Temporal entanglement barriers in dual-unitary Clifford circuits with measurements
J Yao, PW Claeys - Physical Review Research, 2024 - APS
We study temporal entanglement in dual-unitary Clifford circuits with probabilistic
measurements preserving spatial unitarity. We exactly characterize the temporal …
measurements preserving spatial unitarity. We exactly characterize the temporal …
Dynamical correlation functions from complex time evolution
We present an approach to tame the growth of entanglement during time evolution by tensor
network methods. It combines time evolution in the complex plane with a perturbative and …
network methods. It combines time evolution in the complex plane with a perturbative and …
Efficient construction of the Feynman-Vernon influence functional as matrix product states
C Guo, R Chen - arxiv preprint arxiv:2402.14350, 2024 - arxiv.org
The time-evolving matrix product operator (TEMPO) method has become a very competitive
numerical method for studying the real-time dynamics of quantum impurity problems. For …
numerical method for studying the real-time dynamics of quantum impurity problems. For …
Structure of quasiparticles in a local Fermi liquid
I Snyman - Physical Review B, 2023 - APS
Conduction electrons interacting with a dynamic impurity can give rise to a local Fermi liquid.
The latter has the same low-energy spectrum as an ideal Fermi gas containing a static …
The latter has the same low-energy spectrum as an ideal Fermi gas containing a static …