Orbital angular momentum modes of high-gain parametric down-conversion
arXiv:1612.07387 · doi:10.1088/2040-8986/aa600f
Abstract
Light beams with orbital angular momentum (OAM) are convenient carriers of quantum information. They can be also used for imparting rotational motion to particles and provide high resolution in imaging. Due to the conservation of OAM in parametric down-conversion (PDC), signal and idler photons generated at low gain have perfectly anti-correlated OAM values. It is interesting to study the OAM properties of high-gain PDC, where the same OAM modes can be populated with large, but correlated, numbers of photons. Here we investigate the OAM spectrum of high-gain PDC and show that the OAM mode content can be controlled by varying the pump power and the configuration of the source. In our experiment, we use a source consisting of two nonlinear crystals separated by an air gap. We discuss the OAM properties of PDC radiation emitted by this source and suggest possible modifications.
10 pages, 9 figures
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- Photonic quantum information processing: a review
- Properties of bright squeezed vacuum at increasing brightness
- Wide-field SU(1,1) interferometer
- Phase sensitivity of gain-unbalanced nonlinear interferometers
- A classical model of spontaneous parametric down-conversion
- Bright squeezed vacuum for two-photon spectroscopy: simultaneously high resolution in time and frequency, space and wavevector
- Reconstructing 2D spatial modes for classical and quantum light
- Experimental reconstruction of spatial Schmidt modes for a wide-field SU(1,1) interferometer
- Spectral and statistical properties of high-gain parametric down-conversion
- Schmidt modes carrying orbital angular momentum generated by cascaded systems pumped with Laguerre-Gaussian beams