1. Mid-infrared spectrally-uncorrelated biphotons generation from doped PPLN: a theoretical investigation
- Author
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Qiang Zhou, Rui-Bo Jin, Bei Wei, Ryosuke Shimizu, Chunling Ding, Guang-Wei Deng, and Wu-Hao Cai
- Subjects
Materials science ,FOS: Physical sciences ,02 engineering and technology ,01 natural sciences ,010309 optics ,Crystal ,Condensed Matter::Materials Science ,Optics ,Interference (communication) ,Condensed Matter::Superconductivity ,0103 physical sciences ,Thermal ,Range (particle radiation) ,Quantum Physics ,business.industry ,Poling ,Doping ,021001 nanoscience & nanotechnology ,Atomic and Molecular Physics, and Optics ,Wavelength ,Tilt (optics) ,Optoelectronics ,Quantum Physics (quant-ph) ,0210 nano-technology ,business ,Optics (physics.optics) ,Physics - Optics - Abstract
We theoretically investigate the preparation of mid-infrared (MIR) spectrally-uncorrelated biphotons from a spontaneous parametric down-conversion process using doped LN crystals, including MgO doped LN, ZnO doped LN, and In2O3 doped ZnLN with doping ratio from 0 to 7 mol%. The tilt angle of the phase-matching function and the corresponding poling period are calculated under type-II, type-I, and type-0 phase-matching conditions. We also calculate the thermal properties of the doped LN crystals and their performance in Hong-Ou-Mandel interference. It is found that the doping ratio has a substantial impact on the group-velocity-matching (GVM) wavelengths. Especially, the GVM2 wavelength of co-doped InZnLN crystal has a tunable range of 678.7 nm, which is much broader than the tunable range of less than 100 nm achieved by the conventional method of adjusting the temperature. It can be concluded that the doping ratio can be utilized as a degree of freedom to manipulate the biphoton state. The spectrally uncorrelated biphotons can be used to prepare pure single-photon source and entangled photon source, which may have promising applications for quantum-enhanced sensing, imaging, and communications at the MIR range., 11 pages, 9 figures
- Published
- 2020