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Related Experiment Videos

Nonlinear interferometry via Fock-state projection.

G Khoury1, H S Eisenberg, E J S Fonseca

  • 1Department of Physics, University of California, Santa Barbara, California 93106, USA. khoury@physics.ucsb.edu

Physical Review Letters
|June 29, 2006
PubMed
Summary
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Researchers used a photon-number-resolving detector to observe interferometer output, achieving interference patterns five times smaller than the Rayleigh limit by inducing high-order optical nonlinearities.

Area of Science:

  • Quantum optics
  • Interferometry
  • Nonlinear optics

Background:

  • Interferometers are crucial for precise measurements.
  • The Rayleigh limit defines the resolution of optical instruments.
  • Quantum phenomena offer pathways to surpass classical limits.

Purpose of the Study:

  • To investigate photon-number distributions in an interferometer.
  • To explore the induction of high-order optical nonlinearities via postselection.
  • To demonstrate sub-Rayleigh interference patterns using quantum techniques.

Main Methods:

  • Utilizing a photon-number-resolving detector to monitor output.
  • Employing coherent states with varying photon numbers as input.
  • Implementing postselection of specific Fock states.

Related Experiment Videos

  • Following the Bentley and Boyd scheme for optical nonlinearity induction.

    • Main Results:

    • Observed photon-number distributions as a function of phase delay.
    • Successfully induced high-order optical nonlinearities through Fock state postselection.
    • Demonstrated interference patterns significantly below the classical Rayleigh limit (factor of 5 smaller).

    Conclusions:

    • Photon-number postselection is an effective method for inducing nonlinear optical effects.
    • This quantum approach enables surpassing the conventional resolution limits of interferometers.
    • The findings open possibilities for enhanced precision in optical measurements.