Bresque Léa, Camati Patrice A, Rogers Spencer, Murch Kater, Jordan Andrew N, Auffèves Alexia
Université Grenoble Alpes, CNRS, Grenoble INP, Institut Néel, 38000 Grenoble, France.
Department of Physics and Astronomy, University of Rochester, Rochester, New York 14627, USA.
Phys Rev Lett. 2021 Mar 26;126(12):120605. doi: 10.1103/PhysRevLett.126.120605.
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.
我们介绍了一种由纠缠和局部测量驱动的双量子比特引擎。能量通过失谐量子比特相干地交换单个激发来提取。推广到N量子比特链，我们表明，通过连续的相邻交换操作和局部测量，第一个量子比特的低能量可以在上转换为最后一个量子比特的任意高能量。我们最终将局部测量建模为量子比特与测量仪的纠缠，并将燃料确定为消除量子比特之间相关性的能量成本。我们的发现将测量驱动的引擎扩展到复合工作物质，并为燃料机制提供了微观解释。
