Department of Physics, University of Seoul, Seoul 130-743, Korea.
School of Physics, Korea Institute for Advanced Study, Seoul 130-722, Korea.
Phys Rev E. 2016 Mar;93(3):032146. doi: 10.1103/PhysRevE.93.032146. Epub 2016 Mar 28.
A Brownian information engine is a device extracting mechanical work from a single heat bath by exploiting the information on the state of a Brownian particle immersed in the bath. As for engines, it is important to find the optimal operating condition that yields the maximum extracted work or power. The optimal condition for a Brownian information engine with a finite cycle time τ has been rarely studied because of the difficulty in finding the nonequilibrium steady state. In this study, we introduce a model for the Brownian information engine and develop an analytic formalism for its steady-state distribution for any τ. We find that the extracted work per engine cycle is maximum when τ approaches infinity, while the power is maximum when τ approaches zero.
布朗信息引擎是一种从单个热浴中提取机械功的装置，它利用了处于浴中的布朗粒子的状态信息。对于引擎来说，找到产生最大提取功或功率的最佳运行条件是很重要的。由于难以找到非平衡稳态，具有有限循环时间τ的布朗信息引擎的最佳条件很少被研究。在这项研究中，我们引入了一个布朗信息引擎模型，并为其任何τ的稳态分布开发了一个解析形式。我们发现，当τ趋近于无穷大时，每个循环提取的功最大，而当τ趋近于零时，功率最大。
