title: Time-bin-modulated biphotons from cavity-enhanced down-conversion.
abstract: We have generated a new type of biphoton state by cavity-enhanced down-conversion in a type-II phase-matched, periodically poled KTiOPO4 crystal. By introducing a weak intracavity birefringence, we obtained signal and idler photons whose quantum interference was modulated between singlet and triplet signatures according to their arrival-time difference. This cavity-enhanced biphoton source is spectrally bright, yielding a single-mode fiber-coupled coincidence rate of 0.7 pairs/s per mW of pump power per MHz of down-conversion bandwidth.
authors.affiliation: Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
authors.forename: Christopher E
authors.initials: CE
authors.lastname: Kuklewicz
authors.forename: Franco N C
authors.initials: FN
authors.lastname: Wong
authors.forename: Jeffrey H
authors.initials: JH
authors.lastname: Shapiro