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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 implement entanglement concentration by the Schmidt projection protocol, known for its optimal efficiency for large number of qubits, using photon pairs entangled in polarization and momentum and employing single-photon two-qubit quantum logic.
We theoretically demonstrate secure signal transfer by optical excitations involving optical near-field interactions. The energy dissipation processes, occurred locally in the nanometer-scale associated with exciton-phonon interactions, guarantees higher tamper resistance than conventional wired devices.
We report entanglement generation in atomic quantum memories via deterministic mapping of photonic entanglement. The atomic entanglement is retrieved back into photon modes after a programmable storage time, with an overall efficiency of 17%.
We show that attenuated N00N states lead to a worse phase estimate than an equally attenuated N separable state unless the transmittance of the medium is very high.
When a photon propagates in an inhomogeneous medium, its spin and orbital degrees of freedom are coupled. We explore consequences of this effect for fiber-based cluster state linear optical quantum computing (LOQC).
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