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Erlangen 2022 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 67: Rydberg Systems (joint session Q/A)

Q 67.4: Vortrag

Freitag, 18. März 2022, 11:15–11:30, Q-H14

Controlled Dephasing and Unequal Time Correlations in Rydberg Qubits — •Andre Salzinger1, Kevin T. Geier2,3, Titus Franz1, Sebastian Geier1, Nithiwadee Thaicharoen4, Annika Tebben1, Clément Hainaut5, Robert Ott3, Martin Gärttner1, Gerhard Zürn1, Philipp Hauke2, and Matthias Weidemüller11Physikalisches Institut Heidelberg — 2University of Trento — 3Institut für Theoretische Physik Heidelberg — 4Chiang Mai University — 5Université Lille

Engineering open system dynamics relies on restricted degrees of freedom of a larger system. Equivalently, master equations can be derived by averaging over realisations of stochastic processes. We present experimental results for qubit rotations subjected to random phase walks, which are sampled from 1D Brownian motion. The observed realisation average follows a Lindblad description with decay parameter γ given by the variance of sampled phase walks. We use this controlled dephasing in a linear-response scheme to extract the unequal-time anticommutator in an ensemble of driven two-level systems by coupling to an ancilla level. This acts as a first benchmark for future measurements in many-body systems far from equilibrium, where unequal-time commutator and anticommutor probe fluctuation-dissipation relations.

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