Quantum information processing relies on the fundamental property of quantum interference, where the quality of the interference directly correlates to the indistinguishability of the interacting particles. The creation of these indistinguishable particles, photons in this case, has conventionally been accomplished with nonlinear crystals and optical filters to remove spectral distinguishability, albeit sacrificing the number of photons. This research describes the use of an integrated aluminum nitride microring resonator circuit to selectively generate photon pairs at the narrow cavity transmissions, thereby producing spectrally indistinguishable photons. These spectrally indistinguishable photons can then be routed through optical waveguide circuitry, concatenated interferometers, to manipulate and entangle the photons into the desired quantum states. Photon sources and circuitry are only two of the three required pieces of the puzzle. The final piece which this research is aimed at interfacing with are trapped ion quantum memories, based on trapped Ytterbium ions. These ions serve as very long lived and stable quantum memories with storage times on the order of 10’s of minutes, compared with photonic quantum memories which are limited to 10-6 to 10-3 seconds. The caveat with trapped ions is the interaction wavelength of the photons is 369.5nm and therefore the goal of this research is to develop entangled photon sources and circuitry in that wavelength regime to interact directly with the trapped ions and bypass the need for frequency conversion.
Michael L. Fanto, Jeffrey A. Steidle, Tsung-Ju Lu, Stefan F. Preble, Dirk R. Englund, Christopher C. Tison, Amos M. Smith, Gregory A. Howland, Kathy-Anne Soderberg, and Paul M Alsing, "Ultraviolet integrated photonic circuits (Conference Presentation)," Proc. SPIE 9996, Quantum Information Science and Technology II, 99960K (Presented at SPIE Security + Defence: September 27, 2016; Published: 7 December 2016); https://doi.org/10.1117/12.2241892.5229530574001.
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