In the dilute limit of a Brownian all-to-all circuit, the renormalized OTOC grows at the unperturbed chaos rate at early times and saturates to a value set by r/(1+kappa), showing no localization phase transition.
Improving Metrology with Quantum Scrambling
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abstract
Quantum scrambling describes the spreading of local information into many degrees of freedom in quantum systems. This provides the conceptual connection among diverse phenomena ranging from thermalizing quantum dynamics to models of black holes. Here we experimentally probe the exponential scrambling of a multi-particle system near a bistable point in phase space and utilize it for entanglement-enhanced metrology. We use a time-reversal protocol to observe a simultaneous exponential growth of both the metrological gain and the out-of-time-order correlator, thereby experimentally verifying the relation between quantum metrology and quantum information scrambling. Our experiments demonstrate that fast-scrambling dynamics capable of exponentially fast entanglement generation are useful for practical metrology, resulting in 6.8(4) dB gain beyond the Standard Quantum Limit.
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Scrambling Dynamics with Imperfections in a Solvable Model
In the dilute limit of a Brownian all-to-all circuit, the renormalized OTOC grows at the unperturbed chaos rate at early times and saturates to a value set by r/(1+kappa), showing no localization phase transition.