Efficiency of a Brownian information machine
Efficiency of a Brownian information machine
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DOI：
10.1088/1751-8113/45/16/162001
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发表时间：
2012-04-27
影响因子：
2.1
通讯作者：
Seifert, Udo
中科院分区：
文献类型：
--
作者：
Bauer, Michael;Abreu, David;Seifert, Udo
布朗信息机通过利用测量中获得的信息的反馈过程从热浴中提取功。对于典型的情况下，粒子被困在一个谐波电位，我们确定如何功率和效率的两个变种这样的机器周期性地运行取决于周期时间和精度的位置测量。仅控制阱的中心导致在最大功率下具有零效率的机器，而阱的刚度的附加最优控制导致在1/2（其保持最大功率）和1（即使在完美测量的极限中对于有限的循环时间也达到）之间的有界效率。
A Brownian information machine extracts work from a heat bath through a feedback process that exploits the information acquired in a measurement. For the paradigmatic case of a particle trapped in a harmonic potential, we determine how power and efficiency for two variants of such a machine operating cyclically depend on the cycle time and the precision of the positional measurements. Controlling only the center of the trap leads to a machine that has zero efficiency at maximum power, whereas additional optimal control of the stiffness of the trap leads to an efficiency bounded between 1/2, which holds for maximum power, and 1 reached even for finite cycle time in the limit of perfect measurements.