Bulletin of the American Physical Society
APS March Meeting 2023
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session W73: Superconducting Qubits: cQED and Bosonic codes
3:00 PM–5:48 PM,
Thursday, March 9, 2023
Room: Room 405
Sponsoring
Unit:
DQI
Chair: Kevin O'Brien, Massachusetts Institute of Technology MI
Abstract: W73.00011 : Thermal cat states in a high Q niobium cavity setup*
5:00 PM–5:12 PM
Presenter:
Ian Yang
(University of Innsbruck)
Authors:
Ian Yang
(University of Innsbruck)
Christian M Schneider
(University of Innsbruck)
Romain Albert
(University of Innsbruck)
Maximilian Zanner
(Univ of Innsbruck)
Gerhard Kirchmair
(Univ of Innsbruck)
Here, we demonstrate that starting from a classical thermal state, we can create coherent superpositions of these thermal states aka thermal cat states with visible interference fringes highlighting their non-classical nature. Using a high Q Niobium cavity coupled to a superconducting transmon qubit, we experimentally prepare thermal cat states up to a large thermal population of nth>2.
These experiments are especially relevant for applications to opto-mechanical setups and macroscopic quantum systems. Due to the typical kHz-regime mechanical frequencies, there is a large thermal population of the mechanical modes, thus making it challenging to cool to the ground state. With our experiments we show that this is not a necessary requirement for creating non-gaussian states.
*We acknowledge funding by the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme (714235), as well as the support from the Austrian Science Fund FWF within the SFB-BeyondC (F7106-N38).
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