Amplifying microwave pulses with a single qubit engine fueled by quantum measurements

• URL: http://arxiv.org/abs/2501.17069v2
• Date: Thu, 26 Jun 2025 15:04:03 GMT
• Title: Amplifying microwave pulses with a single qubit engine fueled by quantum measurements
• Authors: Rémy Dassonneville, Cyril Elouard, Romain Cazali, Réouven Assouly, Audrey Bienfait, Alexia Auffèves, Benjamin Huard,
• Abstract summary: We demonstrate the amplification of microwave signals by an engine fueled by repeated quantum measurements of a superconducting transmon qubit.<n>Using feedback, the engine acts as a quantum Maxwell demon operating without a hot thermal source.<n>We characterize the long-term stability of the engine as well as its robustness to transmon decoherence, loss and drifts.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Recent progress in manipulating individual quantum systems enables the exploration of engines exploiting non-classical resources. One of the most appealing is the energy provided by the inherent backaction of quantum measurements. While a handful of experiments have investigated the inner dynamics of engines fueled by measurement backaction, powering a useful task by such an engine is missing. Here we demonstrate the amplification of microwave signals by an engine fueled by repeated quantum measurements of a superconducting transmon qubit. Using feedback, the engine acts as a quantum Maxwell demon operating without a hot thermal source. Measuring the gain of this amplification constitutes a direct probing of the work output of the engine, in contrast with inferring the work by measuring the qubit state along its evolution. Observing a good agreement between both work estimation methods, our experiment validates the accuracy of the indirect method. We characterize the long-term stability of the engine as well as its robustness to transmon decoherence, loss and drifts. Our experiment exemplifies a practical usage of the energy brought by quantum measurement backaction.

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