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Opt Express. 2016 Apr 18;24(8):8302-9. doi: 10.1364/OE.24.008302.

Experimental demonstration of polarization encoding quantum key distribution system based on intrinsically stable polarization-modulated units.


A proof-of-principle demonstration of a one-way polarization encoding quantum key distribution (QKD) system is demonstrated. This approach can automatically compensate for birefringence and phase drift. This is achieved by constructing intrinsically stable polarization-modulated units (PMUs) to perform the encoding and decoding, which can be used with four-state protocol, six-state protocol, and the measurement-device-independent (MDI) scheme. A polarization extinction ratio of about 30 dB was maintained for several hours over a 50 km optical fiber without any adjustments to our setup, which evidences its potential for use in practical applications.


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