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- W3123362748 abstract "Motivated by recent work showing that a quantum error correcting code can be generated by hybrid dynamics of unitaries and measurements, we study the long time behavior of such systems. We demonstrate that even in the mixed phase, a maximally mixed initial density matrix is purified on a time scale equal to the Hilbert space dimension (i.e., exponential in system size), albeit with noisy dynamics at intermediate times which we connect to Dyson Brownian motion. In contrast, we show that free fermion systems -- i.e., ones where the unitaries are generated by quadratic Hamiltonians and the measurements are of fermion bilinears -- purify in a time quadratic in the system size. In particular, a volume law phase for the entanglement entropy cannot be sustained in a free fermion system." @default.
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- W3123362748 date "2021-01-17" @default.
- W3123362748 modified "2023-10-16" @default.
- W3123362748 title "How Dynamical Quantum Memories Forget" @default.
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- W3123362748 doi "https://doi.org/10.22331/q-2021-01-17-382" @default.
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