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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.
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.
Multiphoton entangled states are important for quantum cryptography, quantum computation, precise measurements, and subtle tests of quantum mechanics. I will review recent progress in this area, emphasizing some basic applications and the role of decoherence.
We demonstrate, using an all-optical setup, the difference between local and global dynamics of entangled quantum systems coupled to independent environments. Even when the decay of each system is asymptotic, quantum entanglement may suddenly disappear. We also demonstrate experimentally that measurements performed in the environment affects the local evolution.
We design photonic crystal microcavities in diamond films for applications in quantum information yielding high quality factors Q>66000 and small mode volume Vap1.1(lambda/n)3. The calculated quality factors show a strong dependence on material absorption.
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