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Rostock 2019 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 48: Quantum Optics II

Q 48.1: Talk

Thursday, March 14, 2019, 10:30–10:45, S Ex 04 E-Tech

The generation of counterpropagating photons with high-order orbital angular momentum in periodic waveguidesElisabeth Wagner1, Mikolaj Schmidt2, Michael Steel2, and •Polina Sharapova11Department of Physics and CeOPP, University of Paderborn, Warburger Straße 100, 33098 Paderborn, Germany — 2Macquarie University Research Centre in Quantum Science and Technology (QSciTech), MQ Photonics Research Centre, Department of Physics and Astronomy, Macquarie University, New South Wales 2109, Australia

One of the promising and attractive sources of high-dimensional entanglement are orbital angular momentum (OAM) states of light. The (almost) unlimited value of orbital number leads to an unrestricted range of basis states, so-called OAM modes, which may enable larger-alphabet quantum key distribution and provide high-dimensional quantum information resistant to eavesdropping.

In this work we theoretically describe the generation of entangled counterpropagating photons with high-order OAM in a four-wave-mixing process which takes place in a periodic waveguide. Under the assumption of non-degenerate pumps, the signal and idler modes are phase matched by using of two helical grating structures with different periodic lengths. Manipulating of the frequency of the signal and idler photons with using of different helical waveguiede structures was shown. Creating of artificial intensity profiles of the generated photons was demonstrated.

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