Engineering of near-IR photon pairs to be factorable in space-time and entangled in polarization

Kevin Zielnicki, Karina Garay-Palmett, Radhika Dirks, Alfred B. U'Ren, Paul G. Kwiat

Research output: Contribution to journalArticlepeer-review


We present a source of near-infrared photon pairs based on the process of spontaneous parametric downconversion (SPDC), for which the joint signal-idler quantum state is designed to be factorable in the frequency-time and in the transverse position-momentum degrees of freedom. Our technique is based on the use of a broadband pump and vector group velocity matching between the pump, signal, and idler waves. We show experimentally that a source based on this technique can be configured for the generation of: i) pure heralded single photons, and ii) polarization-entangled photon pairs which are free from spectral correlations, in both cases without resorting to spectral filtering. While critical for many applications in optical quantum information processing, such a source has not previously been demonstrated.

Original languageEnglish (US)
Pages (from-to)7894-7907
Number of pages14
JournalOptics Express
Issue number6
StatePublished - Mar 23 2015

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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