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Q: Fachverband Quantenoptik und Photonik

Q 34: Quantum Information (Quantum Communication) I

Q 34.7: Vortrag

Mittwoch, 13. März 2019, 15:30–15:45, S HS 002 Chemie

Entanglement dynamics of orbital angular momentum qubit states upon diffraction on ‘cake-slice’ apertures — •Sabrina Unmüßig, Giacomo Sorelli, Vyacheslav N. Shatokhin, and Andreas Buchleitner — Physikalisches Institut, Albert-Ludwigs-Universität Freiburg

Light beams carrying orbital angular momentum (OAM) have attracted much interest because of their capacity to encode high-dimensional quantum states in their phase fronts. When such beams are diffracted on obstacles [1], their phase fronts get distorted. This leads to the spreading of the initial, well-defined OAM state over the OAM basis and, as a consequence, to the loss of information.

In the case of diffraction on ‘cake-slice’ apertures, the product of the width Δ ℓ of the output distribution of OAM states and of the angular uncertainty Δ φ, defined by the opening angle of the aperture, is bounded from below by the uncertainty principle for angular position and momentum [2]. We study the output entanglement of a pair of counterpropagating photons, prepared initially in a maximally entangled OAM qubit state, upon diffraction on two identical ‘cake-slice’ apertures. We vary the apertures’ opening angle and analyze the resulting entanglement loss in terms of the above uncertainty relation [2].

[1] G. Sorelli et al. Phys. Rev. A 97, 013849 (2018).

[2] S. Franke-Arnold et al. New J. Phys. 6, 103 (2004)