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Spectrally Engineering Photonic Entanglement with a Time Lens.

J M Donohue1, M Mastrovich1,2, K J Resch1

  • 1Institute for Quantum Computing and Department of Physics and Astronomy, University of Waterloo, Waterloo, Ontario, Canada N2L 3G1.

Physical Review Letters
|December 24, 2016
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel time lens to manipulate single photons. This device converts frequency anti-correlations to positive correlations, enabling advanced quantum state engineering.

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Area of Science:

  • Quantum optics
  • Photonics
  • Quantum information science

Background:

  • Time lenses reshape light's spectral and temporal properties.
  • Ultrafast optical signal manipulation is crucial but challenging for single-photon applications.
  • Spontaneous parametric down-conversion (SPDC) produces entangled photon pairs with frequency anti-correlations.

Purpose of the Study:

  • To construct a time lens for spectrally engineering single photons.
  • To demonstrate the conversion of frequency anti-correlations to positive correlations in single photons.
  • To enable new techniques for time-frequency quantum state engineering.

Main Methods:

  • Utilizing dispersion and sum-frequency generation to build the time lens.
  • Employing entangled photon pairs generated via SPDC.
  • Characterizing spectral and temporal properties of single photons before and after the time lens.

Main Results:

  • Successfully constructed a time lens capable of spectrally engineering single photons.
  • Demonstrated the conversion of strong frequency anti-correlations to positive correlations.
  • Confirmed the system's behavior consistent with a negative-magnification system.

Conclusions:

  • The developed time lens effectively engineers spectral properties of single photons.
  • Temporal imaging of single photons opens avenues for advanced quantum state manipulation.
  • This work advances capabilities in time-frequency quantum information processing.