SKM 2023 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 67: Dynamics and Chaos in Many-Body Systems II (joint session DY/TT)
TT 67.7: Talk
Friday, March 31, 2023, 11:15–11:30, MOL 213
Quantum Noise as a Symmetry-Breaking Field — •Paul McClarty1, Beatriz Dias2, Domagoj Perkovic3, Masudul Haque4, and Pedro Ribeiro5 — 1MPI PKS, Dresden, Germany — 2TU Munich, Garching, Germany — 3Cavendish Lab, University of Cambridge, UK — 4TU Dresden, Germany — 5IST, Lisbon, Portugal
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.