FUNDAMENTAL AREAS OF PHENOMENOLOGY(INCLUDING APPLICATIONS) |
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Ultrastable Fiber-Based Time-Domain Balanced Homodyne Detector for Quantum Communication |
WANG Xu-Yang, BAI Zeng-Liang, DU Peng-Yan, LI Yong-Min**, PENG Kun-Chi |
State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Opto-Electronics, Shanxi University, Taiyuan 030006
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Cite this article: |
WANG Xu-Yang, BAI Zeng-Liang, DU Peng-Yan et al 2012 Chin. Phys. Lett. 29 124202 |
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Abstract We present an ultrastable fiber-based time-domain balanced homodyne detector which can be used for precise characterization of pulsed quantum light fields. A variable optical attenuator based on bending the fiber is utilized to compensate for the different quantum efficiencies of the photodiodes precisely, and a common mode rejection ratio of above 76 dB is achieved. The detector has a gain of 3.2 μV per photon and a signal-to-noise ratio above 20 dB. Optical pulses with repetition rates up to 2 MHz can be measured with a detection efficiency of 66%. The stability of the detector is analyzed via an Allan variance measurement and the detector exhibits superior stability which enables a 100-s window for measurement without calibration.
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Received: 25 June 2012
Published: 04 March 2013
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PACS: |
42.50.Dv
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(Quantum state engineering and measurements)
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03.67.Hk
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(Quantum communication)
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