Comparing the Linewidths from Single-Pass SPDC and Singly-Resonant Cavity SPDC
Oliver T. Slattery, Lijun Ma, Paulina S. Kuo, Xiao Tang
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.
, Ma, L.
, Kuo, P.
and Tang, X.
Comparing the Linewidths from Single-Pass SPDC and Singly-Resonant Cavity SPDC, Quantum Communications and Quantum Imaging XII, San Diego, CA, [online], https://doi.org/10.1117/12.2187059
(Accessed December 1, 2021)