Heat Engine Driven by Purely Quantum Information
Heat Engine Driven by Purely Quantum Information
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DOI：
10.1103/physrevlett.111.230402
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发表时间：
2013-12-04
影响因子：
8.6
通讯作者：
Kim, Sang Wook
中科院分区：
文献类型：
--
作者：
Park, Jung Jun;Kim, Kang-Hwan;Kim, Sang Wook
这封信的关键问题是，是否可以使用纯粹的量子力学信息从热机中提取功。如果答案是肯定的，它的数学公式是什么？首先，通过使用二部存储器，我们证明了从热机中提取的功不仅受到单个存储器的自由能变化和熵变之和的限制，而且还受到包含在存储器中的量子互信息的变化的限制。然后我们发现，引擎可以由纯量子信息驱动，表达为所谓的量子不和谐，形成量子互信息的一部分。为了证实这一点，作为一个物理例子，我们给出了一个Szilard引擎，其中包含一个带有半透水壁的双原子分子。
The key question of this Letter is whether work can be extracted from a heat engine by using purely quantum mechanical information. If the answer is yes, what is its mathematical formula? First, by using a bipartite memory we show that the work extractable from a heat engine is bounded not only by the free energy change and the sum of the entropy change of an individual memory but also by the change of quantum mutual information contained inside the memory. We then find that the engine can be driven by purely quantum information, expressed as the so-called quantum discord, forming a part of the quantum mutual information. To confirm it, as a physical example we present the Szilard engine containing a diatomic molecule with a semipermeable wall.