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We propose an optical parametric down conversion (PDC) scheme that does notsuffer a trade-off between the state-purity of single-photon wave-packets andthe rate of packet production. This is accomplished by modifying the PDCprocess by using a microcavity to engineer the density of states of the opticalfield at the PDC frequencies. The high-finesse cavity mode occupies a spectralinterval much narrower than the bandwidth of the pulsed pump laser field,suppressing the spectral correlation, or entanglement, between signal and idlerphotons. Spectral filtering of the field occurs prior to photon creation ratherthan afterward as in most other schemes. Operator-Maxwell equations are solvedto find the Schmidt-mode decomposition of the two-photon states produced.Greater than 99% pure-state packet production is predicted to be achievable.Comment: submitted for publicatio

Pure-state single-photon wave-packet generation by parametric down-conversion in a distributed microcavity