Soliton amplitude squeezed state is obtained and dctected by using asymmetric Sagnac interferometer and balanced homodyne detecting system. An improved photo detector circuit for quantum state detection is introduced....Soliton amplitude squeezed state is obtained and dctected by using asymmetric Sagnac interferometer and balanced homodyne detecting system. An improved photo detector circuit for quantum state detection is introduced. The circuit has a bandwidth of 10MHz and the saturation power is about 19 mW. A maximum photocurrent noise reduction of 1.1 dB below the shot noise is achieved. Taking the detection efficiency into account,the squeezing will be about 1.5 dB.展开更多
The quantum efficiency and the transient response of the InP semiconductor micro-ring resonant detector are analyzed to get the optimum design parameters.Then the side coupling micro-ring resonant is fabricated using ...The quantum efficiency and the transient response of the InP semiconductor micro-ring resonant detector are analyzed to get the optimum design parameters.Then the side coupling micro-ring resonant is fabricated using the InP semiconductor material based on the parameters.The micro-ring resonant cavity has the raius of 80 μm,waveguide width of 3 μm and the coupler gap of 1 μm.The test results show that the FSR is 0.75 nm,and the FWHM is 0.5 nm,which are consistent with the theoretical calculation results.展开更多
基金the National Natural Science Foundation of China (No. 60378011 and No. 60578043)Beijing Education Committee Common Build Foundation (No. XK100130537).
文摘Soliton amplitude squeezed state is obtained and dctected by using asymmetric Sagnac interferometer and balanced homodyne detecting system. An improved photo detector circuit for quantum state detection is introduced. The circuit has a bandwidth of 10MHz and the saturation power is about 19 mW. A maximum photocurrent noise reduction of 1.1 dB below the shot noise is achieved. Taking the detection efficiency into account,the squeezing will be about 1.5 dB.
基金supported by National "973 Program" of China(2003CB314901)the Program for New Century Excellent Talentsin University of China (NCET-05-0111)+1 种基金the National "111 Project"(B07005)the National Program for Changjiang Scholars and Innovative Research Team in University of China (No.IRT0609)
文摘The quantum efficiency and the transient response of the InP semiconductor micro-ring resonant detector are analyzed to get the optimum design parameters.Then the side coupling micro-ring resonant is fabricated using the InP semiconductor material based on the parameters.The micro-ring resonant cavity has the raius of 80 μm,waveguide width of 3 μm and the coupler gap of 1 μm.The test results show that the FSR is 0.75 nm,and the FWHM is 0.5 nm,which are consistent with the theoretical calculation results.
