Detecting heat leaks with trapped ion qubits

• URL: http://arxiv.org/abs/2110.03277v1
• Date: Thu, 7 Oct 2021 09:02:58 GMT
• Title: Detecting heat leaks with trapped ion qubits
• Authors: Daniel Pijn and Oleksiy Onishchenko and Janine Hilder and Ulrich G. Poschinger and Ferdinand Schmidt-Kaler and Raam Uzdin
• Abstract summary: We experimentally demonstrate the utility of two passivity based frameworks: global passivity and passivity deformation. We show that global passivity can verify the presence of a coupling to an unobserved environment - a heat leak. We also show that passivity deformation is even more sensitive, detecting a heat leak where global passivity fails.
• Score: 22.42090005507693
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: 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.

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