Interferometric Phase Estimation Though Quantum Filtering in Coherent States

2016/01/17 by John Gough, Gough, John · 1 citation
Computer Science · Engineering · Physics and Astronomy · #FOS: Physical sciences #Mechanical and Optical Resonators #Photonic and Optical Devices #Quantum Information and Cryptography #Quantum Physics (quant-ph) #quant-ph

paper · pdf · doi:10.48550/arxiv.1601.04374

8 pages, 1 figure

openalex publication_date 2016/01/17 · arxiv created 2016/01/18 · arxiv updated 2016/01/19 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

We derive the form of the quantum filter equation describing the continuous observation of the phase of a quantum system in an arm of an interferometer via non-demolition measurements when the statistics of an input field used for the indirect measurement are in a general coherent state. Both quadrature homodyne detection and photon-counting dection schemes are covered, and we solve the linearized filter for a specific application.

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• Wavefunction collapse through backaction of counting weakly interacting photons

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