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Volume-law to area-law entanglement transition in a non-unitary periodic Gaussian circuit

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arxiv 2212.10584 v2 pith:6Z34ZX76 submitted 2022-12-20 quant-ph cond-mat.stat-mechcond-mat.str-el

Volume-law to area-law entanglement transition in a non-unitary periodic Gaussian circuit

classification quant-ph cond-mat.stat-mechcond-mat.str-el
keywords area-lawtransitionentanglementgaussianmeasurementstimevolume-lawweak
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We consider Gaussian quantum circuits that alternate unitary gates and post-selected weak measurements, with spatial translation symmetry and time periodicity. We show analytically that such models can host different kinds of measurement-induced phase transitions detected by entanglement entropy, by mapping the time evolution and weak measurements to M\"obius transformations. We demonstrate the existence of a log-law to area-law transition, as well as a volume-law to area-law transition. For the latter, we compute the critical exponent $\nu$ for the Hartley, von Neumann and R\'enyi entropies exactly.

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