Erasing Distinguishability Using Quantum Frequency Up-Conversion

Hiroki Takesue
Phys. Rev. Lett. 101, 173901 – Published 21 October 2008

Abstract

The frequency distinguishability of two single photons was successfully erased using single photon frequency up-conversion. A frequency nondegenerate photon pair generated via spontaneous four-wave mixing in a dispersion shifted fiber was used to emulate two telecom-band single photons that were in the same temporal mode but in different frequency modes. The frequencies of these photons were converted to the same frequency by using the sum-frequency generation process in periodically poled lithium niobate waveguides, while maintaining their temporal indistinguishability. As a result, the two converted photons exhibited a nonclassical dip in a Hong-Ou-Mandel quantum interference experiment. The present scheme will add flexibility to networking quantum information systems that use photons with various wavelengths.

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  • Received 18 July 2008

DOI:https://doi.org/10.1103/PhysRevLett.101.173901

©2008 American Physical Society

Authors & Affiliations

Hiroki Takesue*

  • NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato Wakamiya, Atsugi, Kanagawa, 243-0198, Japan
  • CREST, Japan Science and Technology Agency, 4-1-8 Honcho, Kawaguchi, Saitama, 332-0012, Japan

  • *htakesue@will.brl.ntt.co.jp

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Vol. 101, Iss. 17 — 24 October 2008

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