Phase encoding device for quantum key distribution and quantum key distribution system
A quantum key distribution and phase encoding technology, which is applied in the field of phase encoding devices and quantum key distribution systems, can solve the problems of high cost, complexity and high requirements, so as to improve energy utilization, improve security code rate, reduce The effect of cost and complexity
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[0037] like image 3 As shown, the phase encoding apparatus of the present invention is described in Example 1:
[0038] The structure of the phase encoding apparatus is that the unequal arm polarization interferometer includes a first beamformer BS1, a polarization beamformer PBC, and the first optical path selection element OS1 is the first optical switch OSW1, the second The optical path selection element OS2 is a carrier BC, and the phase encoding device further includes a third laser L3, a third partial bundlers BS3, a second annulus CIR2, a third annular CIR3. The third laser L3 is connected as a seed laser, coupled to the input port of the third partial bundar BS3, and two output ports of the third partial bundlers BS3 are respectively associated with the second annulus CIR2 and third annular Cir3, respectively. One-port is connected, the second annular Cir2, the second port of the third annular CIR 3 is connected to the first laser L1, the second laser L2, the second annulu...
Example Embodiment
[0046] like Figure 4 As shown, the phase encoding device of the present invention is described in the second example.
[0047] The structure of the phase encoding apparatus is: the ingredient-polarizing interferometer includes a first beamforcer BS1, a polarization beam selector PBC, and the first optical path selection element OS1 is a fourth beam BS4, the first The two-transparent element OS2 is the second optical switch OSW2, and the polarization, the PBC includes four ports, and the phase encoding device further includes a fourth laser L4 and is coupled to a fourth port of the polarizer PBC.
[0048] The second phase encoding process includes:
[0049] The fourth laser L4 serves as a seed laser, and the short arm of the non-equal arm polarization interferometer through the polarization beam PBC into the first laser L1 and the second laser L2, respectively, injecting the two. When the first laser L1 is triggered, the second laser L2 does not trigger, generates horizontally pola...
Example Embodiment
[0052] like Figure 5 As shown, the phase encoding device of the present invention is described in the third example of the third:
[0053] The structure of the phase encoding apparatus is: the inequal arm polarization interferometer includes a second beam member BS2, a first deserser POL1, a second deserial POL2, a first mirror M1, a second mirror M2, and The first annular CIR1. The first port of the second beam base BS2 is fixed 45 ° between the polarization fibers between the first laser L1, the polarity fiber between the first port of the first annulus CIR1 and the second laser L2. A 45 ° welding is performed, and the second port of the first annular CIR1 is connected to the second port of the second beamforcer BS2, and the third port of the first annular CIR1 is the third port of the uniform arm polarized interferometer. The port is placed at the third port of the second beam BS2, the polarization direction and the horizontal direction angle of 0 °, the second deserial POL2 is ...
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