Fock state interferometry for quantum enhanced phase discrimination

• URL: http://arxiv.org/abs/2102.05772v2
• Date: Sat, 13 Feb 2021 21:25:24 GMT
• Title: Fock state interferometry for quantum enhanced phase discrimination
• Authors: Reihaneh Shahrokhshahi, Saikat Guha, Olivier Pfister
• Abstract summary: We study Fock state interferometry, consisting of a Mach-Zehnder Interferometer with two Fock state inputs and photon-number-resolved detection at the two outputs. We show that it allows discrimination of a discrete number of apriori-known optical phase shifts with an error probability lower than what is feasible with classical techniques under a mean photon number constraint. We describe one application to quantum reading with binary phase-encoded memory pixels.
• Score: 1.0828616610785522
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We study Fock state interferometry, consisting of a Mach-Zehnder Interferometer with two Fock state inputs and photon-number-resolved detection at the two outputs. We show that it allows discrimination of a discrete number of apriori-known optical phase shifts with an error probability lower than what is feasible with classical techniques under a mean photon number constraint. We compare its performance with the optimal quantum probe for M-ary phase discrimination, which unlike our probe, is difficult to prepare. Our technique further allows discriminating a null phase shift from an increasingly small one at zero probability of error under ideal conditions, a feature impossible to attain using classical probe light. Finally, we describe one application to quantum reading with binary phase-encoded memory pixels.

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