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Related Experiment Videos

Nonlinear optics with less than one photon.

K J Resch1, J S Lundeen, A M Steinberg

  • 1Department of Physics, University of Toronto, 60 St. George Street, Toronto, Ontario, Canada M5S 1A7.

Physical Review Letters
|October 3, 2001
PubMed
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Quantum interference with a local oscillator (LO) enables efficient photon up-conversion, enhancing nonlinear effects by over 10 orders of magnitude. This breakthrough creates a novel two-photon switch for quantum nonlinear optics.

Area of Science:

  • Quantum Optics
  • Nonlinear Optics
  • Quantum Information Science

Background:

  • Spontaneous parametric down-conversion (SPDC) is a fundamental quantum optical process.
  • Controlling SPDC typically requires strong optical fields or specialized materials.
  • Quantum interference offers a potential pathway for novel control mechanisms.

Purpose of the Study:

  • To demonstrate the suppression and enhancement of SPDC using quantum interference.
  • To investigate the efficient up-conversion of photon pairs via a local oscillator (LO).
  • To explore the potential of this phenomenon as a two-photon switch.

Main Methods:

  • Utilizing quantum interference between two weak fields and a local oscillator (LO).
  • Precisely controlling phase settings to achieve constructive and destructive interference.

Related Experiment Videos

  • Measuring the efficiency of photon up-conversion and nonlinear effects.

    • Main Results:

    • Achieved significant suppression and enhancement of SPDC.
    • Demonstrated efficient up-conversion of LO photon pairs.
    • Observed an effective nonlinearity enhanced by at least 10 orders of magnitude.
    • Established the functionality as a two-photon switch.

    Conclusions:

    • Quantum interference provides a powerful tool for controlling SPDC.
    • The demonstrated two-photon switch offers unprecedented nonlinearity enhancement.
    • This technique has broad applicability in quantum nonlinear optical phenomena and quantum technologies.