Quantum jump metrology in a two-cavity network

Rasbi, Kawthar Al; Beige, Almut; Clark, Lewis A.

doi:10.1103/physreva.106.062619

Cited by 1 publication

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“…Because of this, HQMMs already found applications in quantum machine learning [61,62] and in simulating open quantum systems [63,64]. For example, HQMMs based on single-mode coherent states can lead to a violation of the standard quantum limit and a quantum advantage in quantum metrology applications even in the absence of entanglement [65][66][67]. Moreover, generalized measurements have interesting applications in quantum communication [68,69].…”

Section: Introductionmentioning

confidence: 99%

Quantum physics cannot be captured by classical linear hidden variable theories even in the absence of entanglement

Al Rasbi,

Clark,

Beige

2024

Front. Phys.

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Recent experimental tests of Bell inequalities confirm that entangled quantum systems cannot be described by local classical theories but still do not answer the question whether or not quantum systems could, in principle, be modeled by linear hidden variable theories. In this paper, we study the quantum trajectories of a single qubit that experiences a sequence of repeated generalized measurements. It is shown that this system, which constitutes a hidden quantum Markov model, is more likely to produce complex time correlations than any classical hidden Markov model with two output symbols. From this, we conclude that quantum physics cannot be replaced by linear hidden variable theories. Indeed, it has already been recognized that not only entanglement but also non-classical time correlations of quantum systems with quantum feedback are a valuable resource for quantum technology applications.

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