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Experimental generation of polarization entanglement from spontaneous parametric down-conversion pumped by spatiotemporally highly incoherent light

Cheng Li1,*, Boris Braverman1, Girish Kulkarni1, and Robert W. Boyd1,2,†

  • 1Department of Physics, University of Ottawa, Ottawa, Ontario, Canada K1N 6N5
  • 2Institute of Optics, University of Rochester, Rochester, New York 14627, USA

  • *cli221@uottawa.ca
  • †rboyd@uottawa.ca
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Phys. Rev. A 107, L041701 – Published 10 April, 2023

DOI: https://doi.org/10.1103/PhysRevA.107.L041701

Abstract

We investigate the cross influence of the pump coherence on the entanglement produced from spontaneous parametric down-conversion (SPDC) in different degrees of freedom (DOFs). We experimentally demonstrate the generation of polarization entanglement from SPDC pumped by a spatiotemporally highly incoherent (STHI) light-emitting diode. Our quantum state tomography measurements using multimode collection fibers to avoid postselection yield a two-qubit state with the concurrence of 0.531±0.006 and purity of 0.647±0.005, in excellent agreement with our theoretically predicted concurrence of 0.552 and purity of 0.652. We find that using an STHI pump reduces the entanglement and purity of the output polarization two-qubit state due to a coupling between the spatiotemporal and polarization DOFs introduced by the birefringence and dispersion of the nonlinear crystal. The viability of SPDC with STHI pumps is important for two reasons: (i) STHI sources are ubiquitous and available at a wider range of wavelengths than lasers, and (ii) the generated STHI polarization-entangled two-photon states could potentially be useful in long-distance quantum communication schemes due to their robustness to scattering.

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Corrections

20 April, 2023

Correction: The previously published Figure 1 contained three incorrect labels and has been replaced.

Article Text

Supplemental Material

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Outline

Information

Phys. Rev. A 107, L041701– Published 10 April, 2023
  • Received 31 October 2022
  • Accepted 20 March 2023
  • Corrected 20 April 2023
Article part of CHORUS
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