Addressing general measurements in quantum Monte Carlo.

ABSTRACT: Quantum Monte Carlo is one of the most promising approaches for dealing with large-scale quantum many-body systems. It has played an extremely important role in understanding strongly correlated physics. However, two fundamental problems, namely the sign problem and general measurement issues, have seriously hampered its scope of application. We propose a universal scheme to tackle the problems of general measurement. The target observables are expressed as the ratio of two types of partition functions ⟨O⟩=Z¯/Z , where Z¯=tr(Oe-βH) and Z=tr(e-βH) . These two partition functions can be estimated separately within the reweight-annealing frame, and then be connected by an easily solvable reference point. We have successfully applied this scheme to XXZ model and transverse field Ising model, f

SUBMITTER: Wang Z 

PROVIDER: S-EPMC12819384 | biostudies-literature | 2026 Jan

REPOSITORIES: biostudies-literature