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We analyze possibilities to create/manipulate photon states encoded in spatial degrees of freedom. We show stringent limits for symplectic transforms acting on paraxial modes, and how to overcome these with novel classes of non-Gaussian operations.
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 review the merits of using fiber as a nonlinear media for production of correlated and entangled photon pairs for quantum information applications and we present history, status, and fruits of efforts in this area.
We present the first experimental generation of 1.5-mum band polarization entanglement based on spontaneous four-wave mixing in a silicon wire waveguide. Two-photon interference fringes with >83% visibilities were successfully obtained.
Quantum networks require the reliable encoding of quantum information in narrow-band single photons which couple efficiently to transitions in atomic ensembles. We show time-bin encoding for photons of 10 MHz width via unbalanced Michelson interferometers and show the applicability of our scheme in a quantum key distribution experiment.
We demonstrate a fully functioning and portable QKD system based on polarisation entanglement for long time usage. We further show the distribution of secure keys a rate of 1 kbit/s over 25 km for 24 hours.
We demonstrate the preservation of entanglement of an energy-time entangled biphoton through a slow light medium. After delay of one photon by ~1.3 correlation lengths, the 1.3 THz biphoton still violates a Bell inequality.
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