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Quantum Communication Using Macroscopic Phase Entangled States
This final report describes the accomplishments of the program after 36 months of funding. A new long-range QKD protocol was proposed and its security was investigated. A pulsed Sagnac interferometer for single-shot phase shift measurements was investigated but not completed due to technical difficulties. Other methods for producing single-photon nonlinear phase shifts were investigated. Randomly-chosen unitary transformations were used to decrease the mutual information available to an eavesdropper. Several nonlinear effects were demonstrated using metastable xenon in a high-finesse cavity, including a nonlinear cross-phase shift. The nonlinear phase shifts were enhanced. Other techniques for long-range secure quantum communications were investigated based on the use of a small amount of shared prior key.
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