All-fiber photon-pair source at telecom wavelengths

Erik Nicolai Christensen, Mario A. Usuga Castaneda, Karsten Rottwitt

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Abstract

Single photon sources are a key element for quantum computing, quantum key distribution (QKD) and quantum communications. In particular, producing single photons at telecommunications wavelengths is valuable for QKD protocols and would enable realizing the quantum internet. The preferred method for their generation has long been spontaneous down conversion in bulk crystals, which suffers from connection loss to fiber networks. In-fiber spontaneous four-wave mixing provides a viable alternative as a photon pair source due to being compatible with existing fiber networks. We present an all-fiber photon pair source based on degenerate four-wave mixing in a 400 m Highly-Nonlinear fiber, with signal and idler wavelengths generated at 1552.5 nm and 1557 nm respectively. The source consists of CW pump laser operating at 1554.75 nm, which is slightly detuned from the zero group velocity dispersion wavelength into the normal dispersion regime. After pair generation in the highly-nonlinear fiber, three arrayed waveguide gratings are employed to spatially separate signal and idler, and provides a 120 dB pump power reduction. Firstly the source is modelled and experimentally characterized in the well known classical regime of stimulated four-wave mixing. The effect of fiber cooling on spontaneous Raman scattering is modelled and characterized, and a 30% reduction in spontaneous emission is found when cooling the fiber to −77 C◦ . In the low power regime the coincidence to accidental count ratio is simulated and measured. An increase in the coincidence to accidental count ratio is observed when cooling the fiber.
Original languageEnglish
Title of host publicationProceedings of SPIE
Number of pages8
Volume10118
PublisherSPIE - International Society for Optical Engineering
Publication date2017
Article number1011814
DOIs
Publication statusPublished - 2017
EventAdvances in Photonics of Quantum Computing, Memory, and Communication X: SPIE Conference 10118 - The Moscone Center, San Francisco, United States
Duration: 28 Jan 20172 Feb 2017

Conference

ConferenceAdvances in Photonics of Quantum Computing, Memory, and Communication X
LocationThe Moscone Center
CountryUnited States
CitySan Francisco
Period28/01/201702/02/2017
SeriesProceedings of SPIE, the International Society for Optical Engineering
Volume10118
ISSN0277-786X

Bibliographical note

Copyright 2017 Society of Photo Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic electronic or print reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.

Keywords

  • Quantum optics
  • Four-wave mixing
  • Photon pair generation
  • Quantum communications
  • Quantum cryptography
  • Fiber optics

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