Ultrastable Fiber-Based Time-Domain Balanced Homodyne Detector for Quantum Communication

doi:10.1088/0256-307X/29/12/124202

Chin. Phys. Lett.

2012, Vol. 29

Issue (12): 124202 DOI: 10.1088/0256-307X/29/12/124202

FUNDAMENTAL AREAS OF PHENOMENOLOGY(INCLUDING APPLICATIONS)

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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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.

Received: 25 June 2012 Published: 04 March 2013

PACS:	42.50.Dv	(Quantum state engineering and measurements)
	03.67.Hk	(Quantum communication)

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https://cpl.iphy.ac.cn/10.1088/0256-307X/29/12/124202 OR https://cpl.iphy.ac.cn/Y2012/V29/I12/124202

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	WANG Xu-Yang
	BAI Zeng-Liang
	DU Peng-Yan
	LI Yong-Min
	PENG Kun-Chi

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