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Preparation and applications of small-scale photonic entanglement

Preparation and applications of small-scale photonic entanglement. Daryl Achilles Eran Mukamel Alfred U’Ren Manuel de la Cruz Eran Mukamel Cezary Śliwa. Christine Silberhorn Konrad Banaszek Ian Walmsley. Interference of single photons from independent sources.

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Preparation and applications of small-scale photonic entanglement

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  1. Preparation and applications of small-scale photonic entanglement Daryl AchillesEran MukamelAlfred U’RenManuel de la Cruz Eran MukamelCezary Śliwa Christine SilberhornKonrad Banaszek Ian Walmsley

  2. Interference of single photons from independent sources Mode matchingof single-photonsources to optical fibers Long-haul quantum communication and cryptography linear-optics quantum computing,quantum teleportation, etc. Modal structure

  3. pump • Need for filtering! Practical down-conversion Singlet state • Usually complicated spatio-temporal structure

  4. Down-conversion in waveguides K. Banaszek, A. B. U'Ren, and I. A. Walmsley, Opt. Lett. 26, 1367 (2001)

  5. Spectral decorrelation Focused beam pumping type-I crystal: Two-photon wave function: A. B. U'Ren, K. Banaszek, and I. A. Walmsley, QIPC (in press)

  6. Characterisation of spatial coherence E. Mukamel, K. Banaszek,I. A. Walmsley, and C. Dorrer, Opt. Lett. (in press)

  7. Experimental results Coherent superposition Collimated beam Divergent beam

  8. Photon-number resolved detection

  9. Count statistics 0.034 0.034 1.75 1.41 2.98 1.93

  10. Conditional preparation C. Śliwa and K. Banaszek,Phys. Rev. A 67, 030101(R) (2003) Single-photon four-fold coincidence heralds generation of a maximally entangled state in modes c and d.

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