Deterministic superresolution with coherent states at the shot noise limit

Emanuele Distante, Miroslav Jezek, Ulrik L. Andersen

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Abstract

Interference of light fields plays an important role in various high-precision measurement schemes. It has been shown that superresolving phase measurements beyond the standard coherent state limit can be obtained either by using maximally entangled multiparticle states of light or using complex detection approaches. Here we show that superresolving phase measurements at the shot noise limit can be achieved without resorting to nonclassical optical states or to low-efficiency detection processes. Using robust coherent states of light, high-efficiency homodyne detection, and a deterministic binarization processing technique, we show a narrowing of the interference fringes that scales with 1/√N where N is the mean number of photons of the coherent state. Experimentally we demonstrate a 12-fold narrowing at the shot noise limit.
Original languageEnglish
JournalPhysical Review Letters
Volume111
Issue number3
Pages (from-to)033603
ISSN0031-9007
DOIs
Publication statusPublished - 2013

Bibliographical note

© 2013 American Physical Society

Keywords

  • Coherent light
  • Complexation
  • Phase measurement
  • Shot noise
  • Quantum entanglement

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