Spectral mapping of polarization-correlated photon-pair sources using quantum-classical correspondence

Chung, Hung-Pin; Kumar, Pawan; Wang, Kai; Bernard, Olivier; Shirpurkar, Chinmay; Su, Wen-Chiuan; Pertsch, Thomas; Sukhorukov, Andrey A.; Chen, Yen-Hung; Setzpfandt, Frank

doi:10.48550/arxiv.2007.00880

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“…Thus, for the nanophotonic ridge waveguide considered here the absolute conversion efficiency is P P /(P S P I ) 0.9 W −1 . When compared with the type-II SFG in low-index contrast LN waveguides, this is more than an order of magnitude larger (Chung et al, 2020). On the other hand, for similar nanophotonic LN ridge waveguides designed for type-0 second harmonic generation, the conversion efficiencies are about 10 times larger than that calculated here for the type-II SFG (Wang et al, 2018b;Rao et al, 2019).…”

Section: Experimental Validation Of Dispersion Engineering and Near G...mentioning

confidence: 56%

Group-index-matched frequency conversion in lithium niobate on insulator waveguides

Kumar

Younesi²,

Saravi³

et al. 2022

Front. Photon.

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Sources of spectrally engineered photonic states are a key resource in several quantum technologies. Of particular importance are the so-called factorizable biphoton states, which possess no spectral entanglement and hence, are ideal for heralded generation of high-purity single photons. An essential prerequisite for generating these states through nonlinear frequency conversion is the control over the group indices of the photonic modes of the source. Here, we show that thin-film lithium niobate on insulator (LNOI) is an excellent platform for this purpose. We design and fabricate periodically poled ridge waveguides in LNOI to demonstrate group index engineering of its guided photonic modes and harness this control to experimentally realize on-chip group index matched type-II sum-frequency generation (SFG). Also, we numerically study the role of the top cladding layer in tuning the dispersion properties of the ridge waveguide structures and reveal a distinctive difference between the air and silica-clad designs which are currently among the two most common device cladding configurations in LNOI. We expect that these results will be relevant for various classical and quantum applications where dispersion control is crucial in tailoring the nonlinear response of the LNOI-based devices.

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Section: Experimental Validation Of Dispersion Engineering and Near G...mentioning

confidence: 56%

Group-index-matched frequency conversion in lithium niobate on insulator waveguides

Kumar

Younesi²,

Saravi³

et al. 2022

Front. Photon.

Self Cite

View full text Add to dashboard Cite

show abstract

Spectral mapping of polarization-correlated photon-pair sources using quantum-classical correspondence

Cited by 1 publication

References 0 publications

Group-index-matched frequency conversion in lithium niobate on insulator waveguides

Group-index-matched frequency conversion in lithium niobate on insulator waveguides

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