2016
DOI: 10.1103/physrevb.93.045308
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Time correlators from deferred measurements

Abstract: Repeated measurements as typically occurring in two-or multi-time correlators rely on von Neumann's projection postulate, telling how to restart the system after an intermediate measurement.We invoke the principle of deferred measurement to describe an alternative procedure where coevolving quantum memories extract system information through entanglement, combined with a final readout of the memories described by Born's rule. The new approach to repeated quantum measurements respects the unitary evolution of q… Show more

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Cited by 7 publications
(17 citation statements)
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“…Recent quasiprobability advances involve out-of-time ordering, including in correlation functions [124][125][126][127][128]. Merging these works with the OTOC framework offers an opportunity for further research (Sec.…”
Section: Theoretical Study Ofãρmentioning
confidence: 99%
“…Recent quasiprobability advances involve out-of-time ordering, including in correlation functions [124][125][126][127][128]. Merging these works with the OTOC framework offers an opportunity for further research (Sec.…”
Section: Theoretical Study Ofãρmentioning
confidence: 99%
“…For a = x, y, the above is achieved when the system rotation axis is orthogonal to the az plane, while for a = z no system rotation is needed since A i = σ z i is already fulfilled by the TPM coupling. The same is true for the ancilla rotation when measuring (20) with a = x, y whereas for a = z no rotation is needed since B = σ z already fulfills condition (19). Estimators (22) are obtained for a = x, y by rotating the ancilla parallel to the a-axis, while for a = z a rotation around the x axis is necessary.…”
Section: Appendix E: Derivation Of the Cnimpmentioning
confidence: 87%
“…Physically relevant states satisfying this condition are, for instance, spin coherent states, or equal superpositions where c ma = 1/ √ 2s + 1 for all m a ∈ S . We choose the latter for our derivation, noting that other choices only lead to modified prefactors f (1) , f (2) in (20) and (22).…”
Section: Noninvasive Measurement Protocolmentioning
confidence: 99%
“…Discussions on quantum measurement in electronic transport systems involve both the von Neumann projecton postulate and detector's backaction on the system 52,53 . In Refs.…”
Section: Introductionmentioning
confidence: 99%