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TT: Fachverband Tiefe Temperaturen
TT 30: Focus Session: Exploring Quantum Entanglement with Superconducting Qubits and Resonators (joint session QI/TT)
TT 30.8: Talk
Tuesday, March 19, 2024, 12:30–12:45, HFT-FT 131
Hot Schrodinger Cat States in a High Coherence Niobium Cavity Coupled to a Superconducting Qubit — •Ian Yang1,2, Thomas Agrenius2,3, Vasilisa Usova1,2, Oriol Romero-Isart2,3, and Gerhard Kirchmair1,2 — 1Institute for Experimental Physics, University of Innsbruck, 6020 Innsbruck, Austria — 2Institute for Quantum Optics and Quantum Information, Austrian Academy of Sciences, 6020 Innsbruck, Austria — 3Institute for Theoretical Physics, University of Innsbruck, Innsbruck 6020, Austria
The observation of quantum phenomena often necessitates sufficiently pure states. The standard paradigm for creating pure states has been to cool the system of interest to the ground state or decouple it sufficiently from any hot thermal bath. This requirement can be challenging to achieve.
In this study, we prepare a non-classical state originating from a mixed state, utilising dynamics that preserve the initial purity of the state. We generate a Schrodinger cat state within a high-coherence microwave cavity, operating at a mode temperature of up to two Kelvin, which is one hundred times hotter than its environment.
Our experimental findings have implications in generating nonclassical states for other bosonic degrees of freedom such as in the motion of a massive particle. Furthermore, they reduce the purity requirements of the initial state.
Keywords: Cat States; High Q Cavity; Superconducting Qubits; Thermal States; Thermal Noise