Time-bin modulated polarization-entangled biphotons from cavity-enhanced down-conversion

We have generated a new type of biphoton state by cavity-enhanced down-conversion in a type-II phase-matched, periodically-poled KTiOPO_4 (PPKTP) crystal. By introducing a weak intracavity birefringence, the polarization-entangled output was modulated between the singlet and triplet states according...

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Bibliographic Details
Published inarXiv.org
Main Authors Kuklewicz, Christopher E, Wong, Franco N C, Shapiro, Jeffrey H
Format Paper
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 10.05.2006
Subjects
Birefringence
Conversion
Coupled modes
Phase matching
Photons
Polarization
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Summary:We have generated a new type of biphoton state by cavity-enhanced down-conversion in a type-II phase-matched, periodically-poled KTiOPO_4 (PPKTP) crystal. By introducing a weak intracavity birefringence, the polarization-entangled output was modulated between the singlet and triplet states according to the arrival-time difference of the signal and idler photons. 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. Its novel biphoton behavior may be utilized in sensitive measurements of weak intracavity birefringence.
ISSN:2331-8422
DOI:10.48550/arxiv.0605093