Two-Qubit Engine Fueled by Entanglement and Local Measurements
Two-Qubit Engine Fueled by Entanglement and Local Measurements
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DOI：
10.1103/physrevlett.126.120605
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发表时间：
2021-03-24
影响因子：
8.6
通讯作者：
Auffeves, Alexia
中科院分区：
文献类型：
--
作者：
Bresque, Lea;Camati, Patrice A.;Auffeves, Alexia
我们引入了一个由纠缠和局部测量驱动的双量子位引擎。从相干地交换单个激发的失谐量子位中提取能量。推广到 N 量子位链，我们表明第一个量子位的低能量可以通过连续的邻居交换操作和局部测量上转换为最后一个量子位的任意高能量。最后，我们将局部测量建模为量子位与仪表的纠缠，并将燃料确定为消除量子位之间的相关性的能量成本。我们的研究结果将测量驱动的发动机扩展到复合工作物质，并提供了燃料供给机制的微观解释。
We introduce a two-qubit engine that is powered by entanglement and local measurements. Energy is extracted from the detuned qubits coherently exchanging a single excitation. Generalizing to an N-qubit chain, we show that the low energy of the first qubit can be up-converted to an arbitrarily high energy at the last qubit by successive neighbor swap operations and local measurements. We finally model the local measurement as the entanglement of a qubit with a meter, and we identify the fuel as the energetic cost to erase the correlations between the qubits. Our findings extend measurement-powered engines to composite working substances and provide a microscopic interpretation of the fueling mechanism.