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• W4362552012 abstract "Abstract Measurement has a special role in quantum theory 1 : by collapsing the wavefunction it can enable phenomena such as teleportation 2 and thereby alter the arrow of time that constrains unitary evolution. When integrated in many-body dynamics, measurements can lead to emergent patterns of quantum information in space-time 3-10 that go beyond established paradigms for characterizing phases, either in or out of equilibrium 11-13 . On present-day NISQ processors 14 , the experimental realization of this physics is challenging due to noise, hardware limitations, and the stochastic nature of quantum measurement. Here we address each of these experimental challenges and investigate measurement-induced quantum information phases on up to 70 superconducting qubits. By leveraging the interchangeability of space and time, we use a duality mapping 9,15-17 to avoid mid-circuit measurement and access different manifestations of the underlying phases—from entanglement scaling 3,4 to measurement-induced teleportation 18 —in a unified way. We obtain finite-size signatures of a phase transition with a decoding protocol that correlates the experimental measurement record with classical simulation data. The phases display sharply different sensitivity to noise, which we exploit to turn an inherent hardware limitation into a useful diagnostic. Our work demonstrates an approach to realize measurement-induced physics at scales that are at the limits of current NISQ processors." @default.
• W4362552012 created "2023-04-06" @default.
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