TY  - JOUR
AU  - Lively, Kevin
AU  - Bode, Tim
AU  - Szangolies, Jochen
AU  - Zhu, Jian-Xin
AU  - Fauseweh, Benedikt
TI  - Noise robust detection of quantum phase transitions
JO  - Physical review research
VL  - 6
IS  - 4
SN  - 2643-1564
CY  - College Park, MD
PB  - APS
M1  - FZJ-2025-04051
SP  - 043254
PY  - 2024
AB  - Quantum computing allows for the manipulation of highly correlated states whose properties quickly go beyond the capacity of any classical method to calculate. Thus one natural problem which could lend itself to quantum advantage is the study of ground-states of condensed matter models, and the transitions between them. However, current levels of hardware noise can require extensive application of error-mitigation techniques to achieve reliable computations. In this work, we use several IBM devices to explore a finite-size spin model with multiple “phaselike” regions characterized by distinct ground-state configurations. Using preoptimized Variational Quantum Eigensolver (VQE) solutions, we demonstrate that in contrast to calculating the energy, where zero-noise extrapolation is required in order to obtain qualitatively accurate yet still unreliable results, calculations of the energy derivative, two-site spin correlation functions, and the fidelity susceptibility yield accurate behavior across multiple regions, even with minimal or no application of error-mitigation approaches. Taken together, these sets of observables could be used to identify level crossings in a simple, noise-robust manner which is agnostic to the method of ground state preparation. This work shows promising potential for near-term application to identifying quantum phase transitions, including avoided crossings and nonadiabatic conical intersections in electronic structure calculations.
LB  - PUB:(DE-HGF)16
DO  - DOI:10.1103/PhysRevResearch.6.043254
UR  - https://juser.fz-juelich.de/record/1046983
ER  -