Enhanced Convergence of Quantum Typicality using a Randomized Low-Rank Approximation

no code implementations • 3 Feb 2021 • Phillip Weinberg

We present a method to reduce the variance of stochastic trace estimators used in quantum typicality (QT) methods via a randomized low-rank approximation of the finite-temperature density matrix $e^{-\beta H}$.

Quantum Physics Quantum Gases Statistical Mechanics Strongly Correlated Electrons Computational Physics

QuSpin: a Python Package for Dynamics and Exact Diagonalisation of Quantum Many Body Systems. Part II: bosons, fermions and higher spins

no code implementations • 18 Apr 2018 • Phillip Weinberg, Marin Bukov

We present a major update to QuSpin, SciPostPhys. 2. 1. 003 -- an open-source Python package for exact diagonalization and quantum dynamics of arbitrary boson, fermion and spin many-body systems, supporting the use of various (user-defined) symmetries in one and higher dimension and (imaginary) time evolution following a user-specified driving protocol.

Computational Physics Quantum Gases Strongly Correlated Electrons