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Quantum mechanical treatment of a light wave that propagates through an absorptive medium is presented. Unlike a phenomenological beam-splitter model conventionally employed to describe a traveling light in a lossy medium, the time evolution of the field operator is derived using the Heisenberg equation with the Hamiltonian for a physical system, where the light wave interacts with an ensemble of...
A quantum key distribution (QKD) scheme named differential-quadrature-phase-shift (DQPS) QKD is presented. A transmitter sends a weak coherent pulse train with a phase of {0, pi} {pi/2. 3pi/2} for each pulse, and a receiver measures it with either one of two delay interferometers respectively having bias phases of 0 and pi/2. The scheme introduces the idea of the BB84 protocol into differential-phase-shift...
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 an entanglement-based BBM92 quantum key distribution experiment using superconducting single photon detectors. A 16-kbit sifted key with a quantum bit error rate of 6.9 % was successfully generated after 100 km fiber transmission.
A novel type of quantum key distribution (QKD) protocol called differential-phase-shift QKD is described. It uses a weak coherent pulse train, and features simple configuration and efficient use of the time domain.
We report a 1.5-mum band energy-time entangled photon pair generation using a periodically poled lithium niobate (PPLN) waveguide. We performed a two-photon interference experiment and obtained coincidence fringes with 77.3% visibilities without subtracting accidental coincidences.
A differential phase shift quantum key distribution experiment employing up-conversion single-photon detectors is presented. We achieved a 1-Mbit/s sifted key rate over a 20-km optical fiber, and distributed keys secure against general individual attacks over 75 km
A novel type of quantum key distribution (QKD) protocol called differential-phase-shift (DPS) QKD is described. It utilizes a weak coherent pulse train instead of individual photons as in conventional QKD
A differential-phase-shift quantum key distribution experiment was carried out using a glass waveguide Mach-Zehnder interferometer. Key creation at the rate of 676 bit/sec with a 5.0% QBER over 25 km fiber was performed
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