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Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
09:23

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Published on: May 30, 2014

Quantum-enhanced optical-phase tracking.

Hidehiro Yonezawa1, Daisuke Nakane, Trevor A Wheatley

  • 1Department of Applied Physics, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.

Science (New York, N.Y.)
|September 22, 2012
PubMed
Summary
This summary is machine-generated.

Researchers improved optical phase tracking precision beyond the standard quantum limit. They utilized phase-squeezed light, achieving a 15% reduction in error compared to traditional methods.

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Area of Science:

  • Quantum optics
  • Metrology
  • Optical communication

Background:

  • Optical phase tracking is crucial for metrology and optical communication.
  • Coherent light's quantum vacuum fluctuations previously limited tracking precision.

Purpose of the Study:

  • To surpass the coherent-state limit in optical phase tracking.
  • To investigate the use of phase-squeezed quantum states for enhanced metrology.

Main Methods:

  • Employed a continuous-wave beam in a phase-squeezed quantum state.
  • Optimized the degree of squeezing for maximal precision.

Main Results:

  • Achieved tracking precision exceeding the coherent-state limit.
  • Demonstrated a 15 ± 4% reduction in mean square error.
  • Found optimal precision occurs at a finite degree of squeezing.

Conclusions:

  • Phase-squeezed states offer superior optical phase tracking.
  • This method overcomes limitations of previous squeezing-enhanced metrology techniques.