NEST, Scuola Normale Superiore, I-56126 Pisa, Italy.
Istituto Italiano di Tecnologia, Graphene Labs, Via Morego 30, I-16163 Genova, Italy.
Phys Rev Lett. 2019 Feb 1;122(4):047702. doi: 10.1103/PhysRevLett.122.047702.
We investigate a quantum battery made of N two-level systems, which is charged by an optical mode via an energy-conserving interaction. We quantify the fraction of energy stored in the battery that can be extracted in order to perform thermodynamic work. We first demonstrate that this quantity is highly reduced by the presence of correlations between the charger and the battery or between the subsystems composing the battery. We then show that the correlation-induced suppression of extractable energy, however, can be mitigated by preparing the charger in a coherent optical state. We conclude by proving that the charger-battery system is asymptotically free of such locking correlations in the N→∞ limit.
我们研究了由 N 个双能级系统组成的量子电池，该电池通过能量守恒相互作用由光模充电。我们量化了可以提取出来以进行热力学功的电池中存储的能量的分数。我们首先证明，充电器和电池之间或组成电池的子系统之间的相关性会极大地降低此数量。然后我们表明，通过将充电器制备在相干光态中，可以减轻相干诱导的可提取能量的抑制。最后我们证明，在 N→∞极限下，充电器-电池系统渐近地没有这种锁定相关性。
