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  • 2013 Conference on Lasers and Electro-Optics - International Quantum Electronics Conference
  • (Optica Publishing Group, 2013),
  • paper IB_1_6

Ultra-narrowband photon pair source for solid state quantum memories based on widely non-degenerate cavity-enhanced downconversion

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Abstract

We present a source of ultra-narrow band, widely non degenerate photon pairs source compatible with quantum repeaters architectures. One photon is compatible with a solid state Praseodymium (Pr3+) doped crystal spin wave quantum memory, and the other photon is at telecommunication wavelengths, such that it can be transmitted over large distances in optical fibers. Pr3+ doped solids absorbing photons at 606 nm have shown very promising properties as QM for light [1]. Despite this fact, so far no experiment demonstrated storage of quantum light in Pr3+ doped crystals. The main challenge to realize such a source is that the bandwidth of the memory is limited to a few MHz by the excited state spacing of the ions. To achieve the required narrow linewidth we use widely non-degenerate cavity enhanced spontaneous down conversion (SPDC) (similar to [2,3,4]). We measure a correlation time of 104 ns, the longest reported to date for SPDC emitted photons, corresponding to around 2 MHz bandwidth. In addition, the number of longitudinal modes emitted by the source is strongly reduced, thanks to a clustering effect [4], which facilitates the filtering to reach single mode operation.

© 2013 IEEE

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