Fully-guided polarization-correlated photon pairs at 1560 nm from a type-II SPDC-based source

Akanksha Angural; Joyee Ghosh

doi:10.1364/OL.509328

Optics Letters
Vol. 49,
Issue 3,
pp. 442-445
(2024)
•https://doi.org/10.1364/OL.509328

Fully-guided polarization-correlated photon pairs at 1560 nm from a type-II SPDC-based source

Akanksha Angural and Joyee Ghosh

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Akanksha Angural and Joyee Ghosh, "Fully-guided polarization-correlated photon pairs at 1560 nm from a type-II SPDC-based source," Opt. Lett. 49, 442-445 (2024)

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Table of Contents Category
- Quantum Optics and Quantum Communication
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About this Article
History
- Original Manuscript: June 26, 2023
- Revised Manuscript: December 1, 2023
- Manuscript Accepted: December 7, 2023
- Published: January 14, 2024

Abstract

The study, reliable generation, and application of spectral and polarization-correlated biphotons is a widely researched area in the field of quantum technology. In this Letter, we report a bright narrowband source of spectral and polarization-correlated orthogonal photon-pairs around the telecom wavelength of 1560 nm from a fiber-pigtailed, type-II quasi-phase-matched, MgO-doped periodically poled lithium niobate (MgO:ppLN) ridge waveguide. We achieved a high spectral brightness of $\thicksim$5×10⁶ photon pairs/s/mW/nm with a coincidence-to-accidental ratio (CAR) value of $\thicksim$427 and an emission bandwidth of $\thicksim$2.4 nm. Owing to its compact and narrowband nature, this source can reliably be used in commercial quantum communication systems for long-distance transmissions. The generation of such high rates of correlated orthogonal twin photons from a fully guided type-II SPDC-based source has not been thoroughly investigated to the best of our knowledge.

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Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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Waveguide	Operation Wavelength	Waveguide Length	Emission Bandwidth	SPDC Conversion Efficiency	Spectral Brightness
Ti:ppLN/W [10]	1550 nm	30 mm	2 nm	$2.6 \times 10^{- 10}$	Not reported
Ti:ppLN/W [11]	1559.8 nm	30 mm	1 nm	$5.3 \times 10^{- 10}$	Not reported
ppLN/W [12]	1550 nm	30 mm	1 nm	Not reported	$6 \times 10^{5}$ pairs/s/GHz/mW
ppLN/ W [13]	1540.2 nm	36 mm	0.85 nm	$3.5 \times 10^{- 10}$ [14]	$2 \times 10^{4}$ pairs/s/nm/mW
Ti:ppLN/W [15]	1550 nm	60 mm	0.7 nm	1.4 $\times 10^{- 10}$	7 $\times 10^{3}$ pairs/s/GHz/mW
MgO:ppLN/W (our source)	1560 nm	16.9 mm	2.4 nm	1.38 $\times 10^{- 9}$	4 $\times 10^{4}$ pairs/s/GHz/mW, 5 $\times 10^{6}$ pairs/s/nm/mW

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