Bright source of polarization-entangled photons using a PPKTP pumped by a broadband multi-mode diode laser

Optics Express
Youn-Chang JeongYoon-Ho Kim

Abstract

We report a bright source of polarization-entangled photon pairs using spontaneous parametric down-conversion (SPDC) in a 10 mm long type-II PPKTP crystal pumped by a broadband multi-mode diode laser with the coherence length of 330 μm. Ordinarily, the huge mismatch between the pump coherence length and the PPKTP length would degrade the polarization entanglement completely. By employing the universal Bell-state synthesizer scheme, we remove the spectral/temporal distinguishability of the biphoton amplitudes entirely to recover high-visibility and high-fidelity two-photon polarization entanglement. The pair detection rates are 7,000 pairs/mW via single-mode fibers (with 99.2% fidelity) and 90,900 pairs/mW via multi-mode fibers (with 96.8% fidelity). We also analyze the scheme theoretically to show the effect of broadband multi-mode pumping on the phase matching condition of the type-II PPKTP.

References

Dec 11, 1995·Physical Review Letters·P G KwiatY Shih
May 3, 2008·Optics Letters·Xiao-Ling NiuZ Y Ou
Nov 12, 2007·Optics Express·Alessandro FedrizziAnton Zeilinger
Jan 7, 2010·Optics Express·Michael HentschelAnton Zeilinger
Apr 8, 2010·Optics Express·Radhika RangarajanPaul Kwiat
Oct 30, 2012·Physical Review Letters·Timur Sh IskhakovGerd Leuchs
Nov 29, 2012·Optics Express·Ana PredojevićGregor Weihs
Jun 6, 2013·Optics Express·Fabian SteinlechnerValerio Pruneri
Jul 6, 2014·Physical Review Letters·Kaiyu LiaoShi-Liang Zhu

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Citations

Oct 5, 2017·Scientific Reports·M V Jabir, G K Samanta
Jul 11, 2021·The Review of Scientific Instruments·Ali AnwarAlexander Ling

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