Detecting heat leaks with trapped ion qubits

Recently, the principle of \textit{passivity} has been used to set bounds on the evolution of a microscopic quantum system with a thermal initial state. In this work, we experimentally demonstrate the utility of two passivity based frameworks: global passivity and passivity deformation, for the dete...

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Bibliographic Details
Published in:arXiv.org 2021-10
Main Authors: Pijn, Daniel, Onishchenko, Oleksiy, Hilder, Janine, Poschinger, Ulrich G, Schmidt-Kaler, Ferdinand, Uzdin, Raam
Format: Article
Language:English
Subjects:
Deformation
Evolution
Passivity
Quantum theory
Qubits (quantum computing)
Thermodynamics
Online Access:Get full text
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Summary:Recently, the principle of \textit{passivity} has been used to set bounds on the evolution of a microscopic quantum system with a thermal initial state. In this work, we experimentally demonstrate the utility of two passivity based frameworks: global passivity and passivity deformation, for the detection of a "hidden" or unaccounted environment. We employ two trapped-ion qubits undergoing unitary evolution, which may optionally be coupled to an unobserved environment qubit. Evaluating the measurement data from the system qubits, we show that global passivity can verify the presence of a coupling to an unobserved environment - a heat leak - in a case where the second law of thermodynamics fails. We also show that passivity deformation is even more sensitive, detecting a heat leak where global passivity fails.
ISSN:2331-8422
DOI:10.48550/arxiv.2110.03277