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Time Correlated Photons using Optical Rephasing Techniques with Rare Earth Ion Doped Solids

Time Correlated Photons using Optical Rephasing Techniques with Rare Earth Ion Doped Solids. Patrick Ledingham and Jevon Longdell Jack Dodd Centre for Quantum Technology, Physics Dept., The University of Otago , New Zealand QIP-REIDS 2011. Two Pulse Photon Echo. High Efficiency

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Time Correlated Photons using Optical Rephasing Techniques with Rare Earth Ion Doped Solids

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  1. Time Correlated Photons using Optical Rephasing Techniques with Rare Earth IonDoped Solids Patrick Ledingham and JevonLongdell Jack Dodd Centre for Quantum Technology, Physics Dept., The University of Otago, New Zealand QIP-REIDS 2011

  2. Two Pulse Photon Echo High Efficiency Temporally Multimode Broadband Quantum Memory for Light

  3. Two Pulse Photon Echo Collective Spontaneous Emission 2PE ≠ QM

  4. Outline • Rephased Amplified Spontaneous Emission • Experimental Results

  5. Rephased Amplified Spontaneous Emission

  6. Rephased Amplified Spontaneous Emission RASE violates Cauchy –Swartz Inequality RASE = broadband time entangled photon streams

  7. Experimental Set Up Interferometer ECDL Hybrid Locking to a Spectral Hole Balanced Heterodyne Detection Sample

  8. Two Pulse Photon Echo Optical Depth = 3.1 Efficiency @ Zero Delay = 190% T2 = ~ 20μs

  9. Amplified Spontaneous Emission 2500 shots at 10Hz π/2, π, 3π/2, 2π tπ = 1.6μs

  10. Amplified Spontaneous Emission Bandwidth of ASE= 170kHz

  11. Amplified Spontaneous Emission ASE is phase independent

  12. Rephased Amplified Spontaneous Emission 100μs 20μs 55μs

  13. Cross-Correlation 6.44μs

  14. Cross-Correlation 60μs 10μs 20μs 3.5μs

  15. Is it Quantum? Inseparability Criterion • Not Quantum, why? • Imperfect π pulses • Detection Mode

  16. Conclusion • Rephased Amplified Spontaneous Emission is a protocol to create broadband time separated entangled photons • Measured a correlation between the ASE and RASE fields – not quantum, yet

  17. Rephased Amplified Spontaneous Emission 60μs 10μs 20μs

  18. Detection Mode

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