Berlin 2024 – scientific programme
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QI: Fachverband Quanteninformation
QI 3: Quantum Communication
QI 3.12: Talk
Monday, March 18, 2024, 12:30–12:45, HFT-TA 441
Ultrafast quantum state transfer and the speed limit of quantum communication — •Przemyslaw Zielinski1,2,3, Iñigo Arrazola4, and Peter Rabl1,2,3 — 1Technical University of Munich, TUM School of Natural Sciences, Physics Department, 85748 Garching, Germany — 2Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany — 3Munich Center for Quantum Science and Technology (MCQST), 80799 Munich, Germany — 4Instituto de Física Teórica, UAM-CSIC, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain
We investigate the controlled transfer of quantum states between two nodes of a quantum network with tunable couplings to a common waveguide. Specifically, we are interested in the performance of the state transfer protocol when the coupling is pushed into the ultrastrong coupling regime and the usual rotating wave approximation does no longer apply. In this regime we use optimal control theory to evaluate the minimal time for which a nearly perfect state transfer fidelity can still be achieved. We discuss the implications of these general findings for quantum communication strategies in superconducting quantum networks, where tunable ultrastrong couplers can be realized with flux-biased Josephson circuits.
Keywords: state transfer; ultrastrong coupling; optimal control; gaussian systems; superconducting quantum networks