Fast Response Balanced Homodyne Detector for Continuous-Variable Quantum Memory

MA Lixia1 QIN Jiliang1 YAN Zhihui1,2 JIA Xiaojun1,2

(1.State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Opto-Electronics, Shanxi University, Taiyuan, Shanxi, China 030006)
(2.Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan, Shanxi, China 030006)

【Abstract】The balanced homodyne detector for continuous-variable quantum memory is improved, and a fast response balanced homodyne detector for real-time measurement of amplitude and phase quadrature components of short pulsed optical signals is obtained. By using the circuits without capacitors and the photodiodes with a high quantum efficiency and a low capacitance, the response time of 65 ns for this balanced homodyne detector is obtained. The signal-to-noise ratio is higher than 12 dB at 2.5 MHz when a laser with a power of more than 100 μW and a wavelength of 795 nm is incident, and the corresponding saturation power is 6.8 mW. This balanced homodyne detector can be applied in the continuous-variable quantum memory, quantum network, and so on.

【Keywords】 quantum optics; balanced homodyne detector; quadrature components; short pulsed optical signal; response time; signal-to-noise ratio;


【Funds】 National Key R&D Program (2016YFA0301402) National Natural Science Foundation of China (61775127, 11474190, 11654002) Program of Introducing Outstanding Young Scholars in Shanxi Province Program for the Returned Overseas Chinese Scholars in Shanxi Province (2016-007)

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(Translated by WEI JM)


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This Article



Vol 38, No. 02, Pages 356-360

February 2018


Article Outline


  • 1 Introduction
  • 2 Circuit design for the fast response BHD
  • 3 Experimental results and performance analysis
  • 4 Conclusions
  • References