Parametric downconversion sources are intrinsically broadband; THz bandwidths are typical. Our recent proposal for long-distance qubit teleportation [1], however, requires a high-brightness narrowband source of polarization entanglement, to match the MHz linewidth of its trapped-atom quantum memory [2]. We have shown theoretically [3] that the polarization-combined outputs from a pair of coherently-pumped, doubly-resonant, optical parametric amplifiers (OPAs) will fulfill this need. That analysis employed a lumped-element model for the OPA behavior in the vicinity of the double resonance, and was sufficiently generic to include both type-I and type-II phase matching. In the present paper, we report a traveling-wave treatment of the type-II phase matched, doubly-resonant OPA. When restricted to frequencies close to the double resonance, the new analysis reproduces the lumped-element results. Without this restriction, however, a new quantum interference effect emerges: coincidence-counting dips and revivals in a Hong-Ou-Mandel interferometer [4].

© 2002 Optical Society of America

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