Erlangen 2022 – scientific programme
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A: Fachverband Atomphysik
A 12: Ultracold Atoms and Plasmas (joint session Q/A)
A 12.15: Poster
Tuesday, March 15, 2022, 16:30–18:30, P
Towards a photonic phase gate using stationary light polaritons — •Lorenz Luger1, Annika Tebben1, Eduard J. Braun1, Titus Franz1, Maximilian Müllenbach1, André Salzinger1, Sebastian Geier1, Clement Hainaut1,2, Gerhard Zürn1, and Matthias Weidemüller1 — 1Physikalisches Institut, Im Neuenheimer Feld 226 — 2Université Lille, CNRS, UMR 8523 -PhLAM- Physique des Lasers, Atomes et Molécules, Lille, France
We work towards a photonic phase gate where a target photon experiences a phase shift of pi depending on the presence of a control photon. By using quantum states, a superposition of atomic coherences and electromagnetic light fields, we take advantage of the long storage times of atomic coherences and the fast transport properties of light fields. The light fields couple an atomic ground state to a long-lived Rydberg state where the fields are chosen such that no short-lived excited states are populated. These quantum states are called dark state polaritons and we incorporate a so-called stationary light polariton where these dark state polaritons are coupled. We aim to achieve a mode coupling like that of a Bragg grating with sharp transmission resonances by finding particular field parameters. In presence of a Rydberg excitation, called Rydberg impurity, the coupling is modified, leading to reflection of an incoming target probe field. By using a Sagnac interferometer this switch between transmission and reflection is transformed in a photonic pi phase gate.