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

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 telecommunicati...

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Bibliographic Details
Published in:Japanese Journal of Applied Physics 2018-06, Vol.57 (6), p.62801
Main Authors: Tamura, Shuhei, Ikeda, Kohei, Okamura, Kotaro, Yoshii, Kazumichi, Hong, Feng-Lei, Horikiri, Tomoyuki, Kosaka, Hideo
Format: Article
Language:English
Subjects:
Computer networks
Conversion
Diamonds
Entanglement
Optical communication
Optical fibers
Signal processing
Vacancies
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Summary: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.
ISSN:0021-4922
1347-4065
DOI:10.7567/JJAP.57.062801