2008/10/21 by Hiroki Takesue
Engineering · Physics and Astronomy · #Optical Network Technologies #Photonic and Optical Devices #Quantum optics and atomic interactions #quant-ph
paper · pdf · doi:10.1103/physrevlett.101.173901
published as Phys. Rev. Lett. 101, 173901 (2008) · 4 pages, 5 figures
openalex publication_date 2008/10/21 · arxiv created 2008/10/22 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/30
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.