We demonstrate the multiplexing of a weak coherent and a quantum state of light in a single telecommunication fiber. For this purpose, we make use of spontaneous parametric down conversion and quantum frequency conversion to generate photon pairs at 854 nm and the telecom O-band. The herald photon at 854 nm triggers a telecom C-band laser pulse. The telecom single photon (O-band) and the laser pulse (C-band) are combined and coupled to a standard telecom fiber. Low-background time correlation between the weak coherent and quantum signal behind the fiber shows successful multiplexing.
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The work was funded by the German Federal Ministry of Science and Education (BMBF) within the projects “Q.com-Q” (Contract No. 16KIS0127). J. Brito acknowledges support by CONICYT.
This paper is part of the topical collection “Quantum Repeaters: From Components to Strategies” guest edited by Manfred Bayer, Christoph Becher and Peter van Loock.
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Lenhard, A., Brito, J., Kucera, S. et al. Single telecom photon heralding by wavelength multiplexing in an optical fiber. Appl. Phys. B 122, 20 (2016). https://doi.org/10.1007/s00340-015-6284-9
- Laser Pulse
- Fiber Bragg Grating
- Quantum Channel
- Wavelength Division Multiplexer
- Lithium Niobate