24-27 November 2022
Karlsruhe Institute of Technology
Europe/Berlin timezone

Towards switchable photon-photon interactions

26 Nov 2022, 16:00
Foyer (KIT Campus South)


KIT Campus South

KIT Campus map: https://www.kit.edu/campusplan/ Building: 30.22 Room: Foyer im 1. und 2. OG Address: Institute of Technology, Engesserstraße 7, 76131 Karlsruhe Coordinates: 49.01244, 8.41062
Poster Physics Posters Poster session


Ms. Karen Wadenpfuhl (PI, Universität Hidelbrg and QLM, Durham University)


Since photons are robust carriers of information, photon-based qubits provide a promising platform for efficient error- and resource-reduced all-optical quantum computing [1,2]. When interfacing photons with matter to so-called polaritons, they additionally inherit strong particle-particle interactions [3,4]. By coupling the photons to highly-excited Rydberg states, long storage times can be achieved even in thermal vapours above room temperature [5].

We use non-interacting Rydberg polaritons to store two photons in an atomic vapour and activate the two-photon interaction on demand by driving to a second pair of strongly interacting Rydberg states. After interaction, the photons can be stored or retrieved coherently [1] from their individual polaritonic states.

We have identified a set of suitable Rydberg states in rubidium to facilitate the required interaction properties for the storage and interaction phases. Currently, the different state transitions are addressed in a thermal vapour to benchmark and optimise the em-field sources, pulsing and read-out. Here, the terahertz transition represents a particular challenge but is similarly exciting, since it extends the spectral range used for quantum simulation and computing to a yet seldom utilised but highly relevant part of the electromagnetic spectrum.

[1] PRL 127, 063604 (2021)
[2] Science 318, 1567 (2007)
[3] Nature 488, 57-60 (2012)
[4] J. Phys. B: At. Mol. Opt. Phys. 49, 152003
[5] Nature Communications 9, 2074 (2018)

Category Other

Primary author

Ms. Karen Wadenpfuhl (PI, Universität Hidelbrg and QLM, Durham University)


Matthias Weidemüller (Physikalisches Institut, Universität Heidelberg) Charles S. Adams (QLM, Durham University)

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