Efficient generation and characterization of spectrally factorable biphotons

Changchen Chen, Cao Bo, Murphy Yuezhen Niu, Feihu Xu, Zheshen Zhang, Jeffrey H. Shapiro, Franco N.C. Wong

Research output: Contribution to journalArticlepeer-review

57 Scopus citations


Spectrally unentangled biphotons with high single-spatiotemporal-mode purity are highly desirable for many quantum information processing tasks. We generate biphotons with an inferred heralded-state spectral purity of 99%, the highest to date without any spectral filtering, by pulsed spontaneous parametric downconversion in a custom-fabricated periodically-poled KTiOPO4 crystal under extended Gaussian phase-matching conditions. To efficiently characterize the joint spectral intensity of the generated biphotons at high spectral resolution, we employ a commercially available dispersion compensation module (DCM) with a dispersion equivalent to 100 km of standard optical fiber and with an insertion loss of only 2.8 dB. Compared with the typical method of using two temperature-stabilized equal-length fibers that incurs an insertion loss of 20 dB per fiber, the DCM approach achieves high spectral resolution in a much shorter measurement time. Because the dispersion amount and center wavelengths of DCMs can be easily customized, spectral characterization in a wide range of quantum photonic applications should benefit significantly from this technique.

Original languageEnglish (US)
Pages (from-to)7300-7312
Number of pages13
JournalOptics Express
Issue number7
StatePublished - Apr 3 2017
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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