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Article Dans Une Revue Physical Review Letters Année : 2022

Energetic Cost of Measurements Using Quantum, Coherent, and Thermal Light

Léa Bresque
Maria Maffei
Andrew Jordan
Alexia Auffèves
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Kater Murch

Résumé

Quantum measurements are basic operations that play a critical role in the study and application of quantum information. We study how the use of quantum, coherent, and classical thermal states of light in a circuit quantum electrodynamics setup impacts the performance of quantum measurements, by comparing their respective measurement backaction and measurement signal to noise ratio per photon. In the strong dispersive limit, we find that thermal light is capable of performing quantum measurements with comparable efficiency to coherent light, both being outperformed by single-photon light. We then analyze the thermodynamic cost of each measurement scheme. We show that single-photon light shows an advantage in terms of energy cost per information gain, reaching the fundamental thermodynamic cost.
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Dates et versions

hal-03688097 , version 1 (25-08-2023)

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Xiayu Linpeng, Léa Bresque, Maria Maffei, Andrew Jordan, Alexia Auffèves, et al.. Energetic Cost of Measurements Using Quantum, Coherent, and Thermal Light. Physical Review Letters, 2022, 128 (22), pp.220506. ⟨10.1103/PhysRevLett.128.220506⟩. ⟨hal-03688097⟩
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