- Letter
- Open Access
Quantum noise as a symmetry-breaking field
Phys. Rev. B 108, L060302 – Published 30 August, 2023
DOI: https://doi.org/10.1103/PhysRevB.108.L060302
Abstract
We investigate the effect of quantum noise on the measurement-induced quantum phase transition in monitored random quantum circuits. Using the efficient simulability of random Clifford circuits, we find that the transition is broadened into a crossover and that the phase diagram as a function of projective measurements and noise exhibits several distinct regimes. We show that a mapping to a classical statistical mechanics problem accounts for the main features of the random circuit phase diagram. The bulk noise maps to an explicit permutation symmetry-breaking coupling; this symmetry is spontaneously broken when the noise is switched off. These results have implications for the realization of entanglement transitions in noisy quantum circuits.
Physics Subject Headings (PhySH)
Article Text
Supplemental Material
References (62)
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