Optical phase estimation via coherent state and displaced photon counting

Abstract

We consider the phase sensing via weak optical coherent state at quantum limit precision. A new detection scheme for the phase estimation is proposed which is inspired by the suboptimal quantum measurement in coherent optical communication. We theoretically analyze a performance of our detection scheme, which we call the displaced-photon counting, for phase sensing in terms of the Fisher information and show that the displaced-photon counting outperforms the static homodyne and heterodyne detections in wide range of the target phase. The proof-of-principle experiment is performed with linear optics and a superconducting nanowire single photon detector. The result shows that our scheme overcomes the limit of the ideal homodyne measurement even under practical imperfections.

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• Squeezing-enhanced phase-shift-keyed binary communication in noisy channels
• Projective measurement onto arbitrary superposition of coherent state bases
• Phase tracking for sub-shot-noise-limited receivers
• Intercept-Resend Emulation Attacks Against a Continuous-Variable Quantum Authentication Protocol with Physical Unclonable Keys
• Single-shot non-Gaussian Measurements for Optical Phase Estimation
• Determination of the asymptotic limits of adaptive photon counting measurements for coherent-state optical phase estimation
• Can we control the amount of useful nonclassicality in a photon added hypergeometric state?
• Optimal transmission estimation with dark counts