Berlin 2024 – wissenschaftliches Programm
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QI: Fachverband Quanteninformation
QI 31: Decoherence and Open Quantum Systems
QI 31.8: Vortrag
Freitag, 22. März 2024, 11:30–11:45, HFT-FT 101
Fast and robust cat state preparation utilizing higher order nonlinearities — •Suocheng Zhao1,2, Matthias Krauss2, Tom Bienaimé3, Shannon Whitlock3, Christiane Koch2,4, Sofia Qvarfort5, and Anja Metelmann6,1,3 — 1IQMT, KIT, Eggenstein-Leopoldshafen, Germany — 2Freie Universität, Berlin, Germany — 3ISIS, University of Strasbourg and CNRS — 4Dahlem Center for Complex Quantum Systems and Fachbereich Physik — 5Nordita and Department of Physics, KTH Royal Institute of Technology and Stockholm University, Stockholm, Sweden — 6TKM, KIT, Karlsruhe, Germany
Cat states are a valuable resource for quantum metrology applications, promising to enable sensitivity down to the Heisenberg limit. Moreover, Schrödinger cat states, based on a coherent superposition of coherent states, show robustness against phase-flip errors making them a promising candidate for bosonic quantum codes. Despite its applications, cat states are difficult to generate. A coherent state can evolve into a cat state under a single Kerr-type anharmonicity as found in superconducting devices as well as Rydberg atoms. Such platforms nevertheless exhibit only the second order anharmonicity, which limits the time it takes for a cat state to be prepared. In this talk, we will show how proper tuning of higher order nonlinearities leads to shorter cat preparation time. We will also discuss practical aspects including optimal control schemes and ways to mitigate decoherence. Lastly, we propose an ensemble of Rydberg atoms that exhibits higher order nonlinearities as a platform to prepare cat states in the laboratory.
Keywords: cat states; higher-order nonlinearity; quantum control; state preparation; Rydberg atom