Abstract

Reliable generation of single photons is of key importance for fundamental physical experiments and quantum protocols. The periodically poled lithium niobate (LN) waveguide has shown promise for an integrated quantum source due to its large spectral tunability and high efficiency, benefiting from the quasi-phase-matching. Here we demonstrate photon-pair sources based on an LN waveguide periodically poled by a tightly focused femtosecond laser beam. The pair coincidence rate reaches ∼8000 counts per second for average pump power of 3.2 mW (peak power is 2.9 kW). Our results prove the possibility of application of the nonlinear photonics structure fabricated by femtosecond laser to the integrated quantum source. This method can be extended to three-dimensional domain structures, which provide a potential platform for steering the spatial degree of freedom of the entangled two-photon states.

© 2023 Chinese Laser Press

Generation of energy-time entangled photon pairs in 1.5-μm band with periodically poled lithium niobate waveguide

T. Honjo, H. Takesue, and K. Inoue
Opt. Express 15(4) 1679-1683 (2007)

Bright narrowband source of photon pairs at optical telecommunication wavelengths using a type-II periodically poled lithium niobate waveguide

Go Fujii, Naoto Namekata, Masayuki Motoya, Sunao Kurimura, and Shuichiro Inoue
Opt. Express 15(20) 12769-12776 (2007)

Femtosecond second-harmonic generation in periodically poled lithium niobate waveguides written by femtosecond laser pulses

Zhangchao Huang, Chenghou Tu, Shuanggen Zhang, Yongnan Li, Fuyun Lu, Yaxian Fan, and Enbang Li
Opt. Lett. 35(6) 877-879 (2010)

Generation of pulsed polarization-entangled photon pairs in a 1.55-µm band with a periodically poled lithium niobate waveguide and an orthogonal polarization delay circuit

Hiroki Takesue, Kyo Inoue, Osamu Tadanaga, Yoshiki Nishida, and Masaki Asobe
Opt. Lett. 30(3) 293-295 (2005)

Multifunction integrated lithium niobate photonic chip for photon pairs generation and manipulation

Tien-Dat Pham, Cheng-Chung Chiu, Pin-Ju Tsai, and Yen-Hung Chen
Opt. Express 32(3) 3673-3687 (2024)