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Quantum information scrambling in a trapped-ion quantum simulator with tunable range interactions
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In ergodic many-body quantum systems, locally encoded quantum information becomes, in the course of time evolution, inaccessible to local measurements. This concept of "scrambling" is currently of intense research interest, entailing a deep understanding of many-body dynamics such as the processes of chaos and thermalization. Here, we present first experimental demonstrations of quantum information scrambling on a 10-qubit trapped-ion quantum simulator representing a tunable long-range interacting spin system, by estimating out-of-time ordered correlators (OTOCs) through randomized measurements. We also analyze the role of decoherence in our system by comparing our measurements to numerical simulations and by measuring R\'enyi entanglement entropies.
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Refining the Understanding of Operator Size Dynamics in Open Quantum Systems
In Brownian SYK models, operator size under the bath-traced Lindblad definition shows a scrambling signature only for intra-system interactions, with the same early-time critical point as the full-contour definition, ...
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