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Continuous Real-Time Tracking of a Quantum Phase Below the Standard Quantum Limit.

08:00 EDT 14th June 2019 | BioPortfolio

Summary of "Continuous Real-Time Tracking of a Quantum Phase Below the Standard Quantum Limit."

We propose a scheme for continuously measuring the evolving quantum phase of a collective spin composed of N pseudospins. Quantum nondemolition measurements of a lossy cavity mode interacting with an atomic ensemble are used to directly probe the phase of the collective atomic spin without converting it into a population difference. Unlike traditional Ramsey measurement sequences, our scheme allows for real-time tracking of time-varying signals. As a bonus, spin-squeezed states develop naturally, providing real-time phase estimation significantly more precise than the standard quantum limit of Δϕ_{SQL}=1/sqrt[N]  rad.

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This article was published in the following journal.

Name: Physical review letters
ISSN: 1079-7114
Pages: 233602

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