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A novel polarization-frequency-multiplexing scheme is implemented to suppress noise in a fiber-based Gaussian-modulated coherent-state quantum key distribution system. The achievable secrete key rate is 0.30 bit/pulse with a 5 km-fiber and 0.05 bit/pulse with a 20 km-fiber.
We report a differential phase shift quantum key distribution experiment using up-conversion detectors. Though the detectors had polarization dependency, we were able to make the system polarization-independent by using polarization modulation.
We report on fractional decay suppression as well as decay deceleration and acceleration of an unstable quantum mechanical state. The decay is directly observed in a system of optical waveguides.
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