Erlangen 2022 – scientific programme
Parts | Days | Selection | Search | Updates | Downloads | Help
Q: Fachverband Quantenoptik und Photonik
Q 10: Quantum Information (Concepts and Methods) II
Q 10.5: Talk
Monday, March 14, 2022, 17:30–17:45, Q-H12
On Quantum Cats and How to Control Them — •Matthias G. Krauss1,2, Daniel M. Reich1,2, and Christiane P. Koch1,2 — 1Universität Kassel, Kassel, Germany — 2Freie Universität, Berlin, Germany
Schrödinger cat states are non-classical superposition states that are useful in quantum information science, for example for computing or sensing. Optimal control theory provides a set of powerful tools for preparing such superposition states, for example in experiments with superconducting qubits [Ofek, et al. Nature 536, 2016]. In general, the preparation of specific cat states is considered to be a hard problem [Kallush et al. New J. Phys. 16, 2014]. Since many applications do not rely on a particular cat state, it can be beneficial to optimize towards arbitrary cat states instead. We derive optimization functionals that target the cat properties without prescribing a specific cat state. To analyze the practical performance of these functionals, we exemplify their use in conjunction with Krotov’s method [Reich et al. J. Chem. Phys. 136, 2012]. In particular, we analyze the quantum speed limit for generating entangled cat states in a Jaynes-Cummings model and test their robustness under dissipation.