局域能量约束下的量子读出
Quantum reading under a local energy constraint
摘要：
光的非经典态在许多量子信息协议中起着核心作用。它们的量子特性已被利用来改善从数字存储器中读取信息的能力，模拟为微观分束器阵列[S。Pirandola，Phys. Rev. Lett. 106，090504（2011）]。在这个量子阅读模型中，具有爱因斯坦-波多尔斯基-罗森关联的非经典光源已被证明比任何经典光源都能获取更多的信息。特别地，量子经典比较已经在全局能量约束下进行，即，通过固定照射在每个存储单元上的光子的平均总数。在本文中，我们提供了一种替代的分析，这是基于当地的能量约束，这意味着我们固定的平均光子数，每个信号模式照射的存储单元。在这个假设下，我们调查的临界信号模式后，一个非经典光源能够击败任何经典源照射相同数量的信号。
英文摘要：
Nonclassical states of light play a central role in many quantum information protocols. Their quantum features have been exploited to improve the readout of information from digital memories, modelled as arrays of microscopic beam splitters [S. Pirandola, Phys. Rev. Lett. 106, 090504 (2011)]. In this model of quantum reading, a nonclassical source of light with Einstein-Podolski-Rosen correlations has been proven to retrieve more information than any classical source. In particular, the quantum-classical comparison has been performed under a global energy constraint, i.e., by fixing the mean total number of photons irradiated over each memory cell. In this paper we provide an alternative analysis which is based on a local energy constraint, meaning that we fix the mean number of photons per signal mode irradiated over the memory cell. Under this assumption, we investigate the critical number of signal modes after which a nonclassical source of light is able to beat any classical source irradiating the same number of signals.
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