Optical phase estimation via the coherent state and displaced-photon counting

Shuro Izumi, Masahiro Takeoka, Kentaro Wakui, Mikio Fujiwara, Kazuhiro Ema, Masahide Sasaki

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)


We consider the phase sensing via a weak optical coherent state at quantum limit precision. A 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 a 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.

Original languageEnglish
Article number033842
JournalPhysical Review A
Issue number3
Publication statusPublished - 2016 Sept 22
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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