Thermodynamic limits to information harvesting by sensory systems
Thermodynamic limits to information harvesting by sensory systems
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DOI：
10.1088/1742-5468/2015/01/p01014
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发表时间：
2015-01-01
影响因子：
2.4
通讯作者：
Celani, Antonio
中科院分区：
文献类型：
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作者：
Bo, Stefano;Del Giudice, Marco;Celani, Antonio
从信息学和热力学之间的关系出发，我们研究了在给定能量预算的情况下，随机测量设备的存储器中可以存储多少关于外部协议的信息。我们考虑具有存储关于外部环境的信息的存储组件的分层设备，该存储组件通过监视耦合到环境的感官部分的历史来存储有关外部环境的信息。我们导出了一个关于信息熵产生的积分涨落定理和存储器件中积累的信息的一种度量。它最直接的结果是，信息量受到该过程产生的平均热力学熵的限制。在平衡状态下，不会产生任何熵，因此存储设备不会将有关环境的任何信息添加到感觉组件中。因此，如果系统在平衡状态下运行，则存储器组件的添加是多余的。这种装置可以用来模拟细胞的传感过程，测量化合物的外部浓度，并对磷酸化细胞质蛋白质的量进行编码。
In view of the relation between information and thermodynamics we investigate how much information about an external protocol can be stored in the memory of a stochastic measurement device given an energy budget. We consider a layered device with a memory component storing information about the external environment by monitoring the history of a sensory part coupled to the environment. We derive an integral fluctuation theorem for the entropy production and a measure of the information accumulated in the memory device. Its most immediate consequence is that the amount of information is bounded by the average thermodynamic entropy produced by the process. At equilibrium no entropy is produced and therefore the memory device does not add any information about the environment to the sensory component. Consequently, if the system operates at equilibrium the addition of a memory component is superfluous. Such a device can be used to model the sensing process of a cell measuring the external concentration of a chemical compound and encoding the measurement in the amount of phosphorylated cytoplasmic proteins.