Method for obtaining single photon output according to photon number distribution in output port
A technology of photon count and output port, applied in the field of optical quantum secure communication, can solve problems such as measurement and control difficulties, and achieve the effect of reducing loss and high control accuracy
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Embodiment 1
[0041] Such as figure 1 As shown, the light source LD is a domestic distributed feedback 1310 nanometer wavelength semiconductor laser, model LDM3S735. The homemade pulse power drive generates 2MHz optical pulse output and enters the programmable control variable attenuator VOA. The programmable control variable attenuator VOA Imported EXFO IQ-3100, programmable control output signal to determine the light intensity, photodetector D measures the light intensity signal from the first 50:50 beam splitter coupler C2, extracts the feedback control signal, and the light intensity signal passes through in turn Three 5:95 beam splitting couplers C1, the spare output ports are all connected with anti-reflection end caps E1 and E2, the anti-reflecting end caps respectively output 95% of the photon number of the beam splitting coupler C1, which can be used as spare output ports To detect the attenuation state or open up a new single-photon channel. After the third 5:95 splitting coupler C1...
Embodiment 2
[0043] Such as figure 2 As shown, the light source is PDL-808-SC produced by German PicoQuant, which outputs short light pulses with a wavelength of 1310 nanometers and a wavelength of 50ps. When the pulse repetition frequency is 40MHz, the average output power is 0.05Mw. Corresponding to approximately 8 million photons per pulse, four consecutive stages are connected in series 5:95 split-beam coupler, 52dB attenuation is obtained at the 5% output port of the last 5:95 split-beam coupler, and 6 photons per pulse are obtained. The split-beam coupler C2 is a 50:50 split-beam coupler, according to If necessary, you can press 1 point 2, 2 points 4, 4 points 8 or 2 n Points 2 n+1 (n=0,1,2,3,4...), to get any attenuation, for example, for the output with an average photon number of 0.1 commonly used in quantum communication, take 5 levels of C2 beam splitting, and the end is a polarization beam splitter , Get the photon output of the determined polarization state, this system will have...
Embodiment 3
[0045] Such as image 3 , The light source is PDL-808-SC produced by German PicoQuant, outputting a short light pulse with a wavelength of 1310 nanometers and a wavelength of 50ps. When the pulse repetition frequency is 40MHz, the average output power is 0.05Mw. Corresponding to about 8 million photons per pulse, three consecutively connected 5: The 95 split coupler The split coupler C2 is a 50:50 split coupler. According to the needs, it can be divided into 1 point 2, 2 points 4, 4 points 8 or 2 n Points 2 n+1 (n=0,1,2,3,4...), get any attenuation, the fiber connector C3 is the output port, the optical detector, the output electrical signal is divided into two channels, one is used to display the input power, the other is used for control Enter the light intensity.
[0046] Such as Figure 4 As shown, when the average photon number of the pulse is different, the probability of single photon, two photon, three photon and four photon in the pulse can be seen when the average photon ...
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