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Q: Fachverband Quantenoptik und Photonik

Q 45: Quantum Effects (QED) II

Q 45.8: Vortrag

Donnerstag, 12. März 2020, 12:45–13:00, f442

Control of directionality in photon storage — •Martin Korzeczek and Daniel Braun — University Tübingen - Institute for Theoretical Physics, Tübingen, Germany

When storing light pulses in atomic clouds, emission directionality is usually determined fully by the signal and control pulse directionality. Making use of the fact that the spin wave encodes the pulse directionalities in complex phases in Hilbert space, we propose a method of manipulating these phases and achieving arbitrary emission directions. Using a fully 3d numerical model and Gaussian pulses, we analyse the scaling of storage efficiency and its dependence on pulse directionality and cloud parameters. Additionally to determining the emission directionality, the phases in Hilbert space play a role in the degradation of the spin wave. Controlling them opens up the possibility of avoiding this source of state degradation, which adds to the methods for improving storage time.