Generation of spatially pure photon pairs in a multimode nonlinear waveguide using intermodal dispersion
arXiv:1209.5349 · doi:10.1117/12.928840
Abstract
We present experimental realization of type-II spontaneous parametric down-conversion in a periodically poled potassium titanyl phosphate (KTiOPO4) nonlinear waveguide. We demonstrate that by careful exploitation of intermodal dispersion in the waveguide it is feasible to produce photon pairs in well defined transverse modes without any additional spatial filtering at the output. Spatial characteristics is verified by measurements of the M2 beam quality factors. We also prepared a postselected polarization-entangled two-photon state shown to violate Bell's inequality. Similar techniques based on intermodal dispersion can be used to generate spatial entanglement and hyperentanglement.
11 pages, 5 figures, submitted to Proceedings of Quantum Communications and Quantum Imaging X Conference at SPIE 2012 Optics + Photonics, San Diego, 12-16 August 2012
References in corpus (16)
- Quantum Cryptography
- Advances in Quantum Metrology
- The Security of Practical Quantum Key Distribution
- Photonic quantum technologies
- Generation of Hyperentangled Photons Pairs
- Quantum Nonlocality in Phase Space
- A bright, pulsed two-mode squeezer
- Photonic crystal fibre source of photon pairs for quantum information processing
- Conditional preparation of single photons for scalable quantum-optical networking
- Photon pair generation in birefringent optical fibers
- Generation of correlated photons in controlled spatial modes by down-conversion in nonlinear waveguides
- A pulsed Sagnac source of narrowband polarization-entangled photons
- Direct Measurement of the Spatial-Spectral Structure of Waveguided Parametric Down-Conversion
- Modelling and optimization of photon pair sources based on spontaneous parametric down-conversion
- A microstructured fiber source of photon pairs at widely separated wavelengths
- Dispersion-based control of modal characteristics for parametric down-conversion in a multimode waveguide