Two-step frequency conversion for connecting distant quantum memories by transmission through an optical fiber

Abstract

Long-distance quantum communication requires entanglement between distant quantum memories. For this purpose, photon transmission is necessary to connect the distant memories. Here, for the first time, we develop a two-step frequency conversion process (from a visible wavelength to a telecommunication wavelength and back) involving the use of independent two-frequency conversion media where the target quantum memories are nitrogen-vacancy centers in diamonds (with an emission/absorption wavelength of 637.2 nm), and experimentally characterize the performance of this process acting on light from an attenuated CW laser. A total conversion efficiency of approximately 7% is achieved. The noise generated in the frequency conversion processes is measured, and the signal-to-noise ratio is estimated for a single photon signal emitted by a nitrogen-vacancy (NV) center. The developed frequency conversion system has future applications via transmission through a long optical fiber channel at a telecommunication wavelength for a quantum repeater network.

21 pages, 7 figures, submitted to JJAP

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Cited by in corpus (4)

• Spectral noise in quantum frequency down-conversion from the visible to the telecommunication C-band
• Two-photon comb with wavelength conversion and 20-km distribution for quantum communication
• Frequency-multiplexed storage and distribution of narrowband telecom photon pairs over a 10-km fiber link with long-term system stability
• A compact frequency-stabilized pump laser for wavelength conversion in long-distance quantum communication