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3 September 2015 Comparing the linewidths from single-pass SPDC and singly resonant cavity SPDC
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Spontaneous parametric down-conversion (SPDC) is a common method to generate entangled photon pairs for use in quantum communications. The generated single photon linewidth is a critical issue for photon-atom interactions in quantum memory applications. We compare the linewidths of greatly non-degenerate single photon pairs from SPDC generated in the single-pass case and the singly-resonant cavity case. For a 6 mm periodically poled lithium niobate (PPLN) crystal, the linewidth of the generated signal photons is reduced from 1 THz in the single pass case to tens of MHz in the singly-resonant cavity case, while the brightness within the modal lineiwdth is increased by a factor of the cavity finesse, though the overall SPDC generation rate remains unchanged.
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Oliver Slattery, Lijun Ma, Paulina Kuo, and Xiao Tang "Comparing the linewidths from single-pass SPDC and singly resonant cavity SPDC", Proc. SPIE 9615, Quantum Communications and Quantum Imaging XIII, 961507 (3 September 2015);

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