Implementation of Balanced Homodyne Detectors with the Common Mode Rejection Ratio Higher Than 50 dB
吳訓忠1*, 吳建明1
1光電所, 國立清華大學, 新竹, Taiwan
2光電所, 國立清華大學, 新竹, Taiwan
* Presenter:吳訓忠,
To measure the quantum noise fluctuations in the continuous variables, we design and implement a balanced homodyne detector (BHD) for cancelling out the classical noises (electronic noise and thermal noise) in the electric circuit, mainly with two almost identical photodiodes and op-amplifiers. To evaluate the performance of our BHD, we measure the quantum efficiency of the photodiode, up to 68%; and the corresponding Common Mode Rejection Ratio (CMRR) higher than 52 dB.

Keywords: Balanced homodyne detector, Quantum Efficiency