Fast Response Balanced Homodyne Detector for Continuous-Variable Quantum Memory
(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;
(Translated by WEI JM)
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