Abstract

We derive exact, universal, closed-form quantum Monte Carlo estimators for finite temperature energy susceptibility and fidelity susceptibility for essentially arbitrary Hamiltonians. We demonstrate how our method can be used to study quantum phase transitions without knowledge of an order parameter and without the need to design system-specific ergodic quantum Monte Carlo update rules by applying it to a class of random models.

Date

August 7, 2024

Authors

Nic Ezzell, Lev Barash, Itay Hen

Journal

arXiv preprint arXiv:2408.03924