Erlangen 2022 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 49: Ultra-cold atoms, ions and BEC III (joint session A/Q)
Q 49.5: Vortrag
Donnerstag, 17. März 2022, 11:45–12:00, A-H2
Quantum thermodynamics: Heat leaks and fluctuation dissipation — •Oleksiy Onishchenko1, Daniël Pijn1, Janine Hilder1, Ulrich Poschinger1, Raam Uzdin2, and Ferdinand Schmidt-Kaler1 — 1QUANTUM, Institut für Physik, Universität Mainz, Mainz, Germany — 2Fritz Haber Center for Molecular Dynamics, The Hebrew University, Jerusalem, Israel
Quantum thermodynamics focuses on extending the notions of heat and work to microscopic systems, where the concepts of non-commutativity and measurement back-action play a role [1]. In this work, we show a novel way to test the unitary functioning of a quantum processor by detecting heat leaks [2]. We also observe the first experimental signatures of operator non-commutativity on work fluctuations, as suggested theoretically [3]. Our experimental system consists of one or multiple Ca+ ion qubits held in a microstructured Paul trap. We initialize qubits in a statistical mixture of |0> and |1>, thus emulating thermal states. For the heat leak test, we reveal the amount of non-unitary evolution of the system qubits by measuring only in the computational basis and without accessing the environment. For the quantum work measurement, we set the operation and measurement bases to be non-commuting, and then evaluate the resulting work distribution.
[1] Sai Vinjanampathy and Janet Anders, Contemporary Physics 57, 545-579 (2016).
[2] D. Pijn et. al., arXiv:2110.03277v1 (2021).
[3] M. Scandi et. al., Physical Review Research 2, 023377 (2020)