Department of Physics and Astronomy, University of Rochester, Rochester, New York 14627, USA.
Center for Coherence and Quantum Optics, University of Rochester, Rochester, New York 14627, USA.
Phys Rev Lett. 2018 Jun 29;120(26):260601. doi: 10.1103/PhysRevLett.120.260601.
We propose quantum engines powered entirely by a position-resolving measurement performed on a quantum particle. These engines produce work by moving the quantum particle against a force. Unlike classical information-driven engines (e.g., Maxwell's demon), the energy is not extracted from a thermal hot source but directly from the observation process via a partial wave-function collapse of the particle. We present results for the work done and the efficiency for different values of the engine parameters. Feedback is required for optimal performance. We find that unit efficiency can be approached when one measurement outcome prepares the initial state of the next engine cycle, while the other outcomes leave the original state nearly unchanged.
我们提出了一种完全由对量子粒子的位置分辨测量驱动的量子引擎。这些引擎通过对抗力来移动量子粒子来产生功。与经典的信息驱动引擎（例如麦克斯韦妖）不同，能量不是从热热源中提取的，而是直接通过粒子的部分波函数坍缩从观测过程中提取的。我们给出了不同引擎参数下所做的功和效率的结果。为了达到最佳性能，需要反馈。我们发现，当一种测量结果准备下一个引擎周期的初始状态，而其他结果几乎使原始状态不变时，可以接近单位效率。
