Energetic Cost of Measurements Using Quantum, Coherent, and Thermal Light
Energetic Cost of Measurements Using Quantum, Coherent, and Thermal Light
复制标题
使用量子光、相干光和热光进行测量的能量成本
DOI：
10.1103/physrevlett.128.220506
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发表时间：
2022
影响因子：
8.6
通讯作者：
Murch, Kater W.
中科院分区：
文献类型：
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作者：
Linpeng, Xiayu;Bresque, Léa;Maffei, Maria;Jordan, Andrew N.;Auffèves, Alexia;Murch, Kater W.
量子测量是量子信息研究和应用中起着至关重要作用的基本操作。我们研究了在电路量子电动力学装置中使用光的量子、相干和经典热态如何影响量子测量的性能，通过比较它们各自的测量后向反应和每光子的测量信噪比。在强色散极限下，我们发现热光能够以与相干光相当的效率进行量子测量，两者的性能都优于单光子光。然后，我们分析了每种测量方案的热力学成本。我们表明，单光子光在每信息增益的能量成本方面显示出优势，达到了基本的热力学成本。
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.