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arXiv 1306.4275quant-phgr-qc
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腔QED中的量子信号

Quantum signalling in cavity QED

Robert H. Jonsson, Eduardo Martin-Martinez, Achim Kempf

备注：
RevTex 4.1. 15 pages, 7 figures. V2: extended version with extra detail. Some minor additional changes to match published version
发表信息：
Phys. Rev. A 89, 022330 (2014)
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摘要：

我们认为量子信号之间的两个级别的量子系统在一个腔中，在微扰制度的最早可能的到达时间的信号。我们提出了两个主要结果：首先，我们发现，也许令人惊讶的是，幅度调制信号的模拟（爱丽丝使用她的能量本征态|g>，|e>，如在费米问题中）对于通信来说通常是次优的。即，例如，相位调制信令（Alice使用，例如，|+>,|态）克服了微扰理论中已经处于较低阶的量子噪声。其次，我们研究了腔QED中常用的模式截断对二能级原子间通信模型的影响。我们表明，在一般的理由，即因果关系被保存，UV截止必须至少与所需的预测精度多项式缩放。

英文摘要：

We consider quantum signalling between two-level quantum systems in a cavity, in the pertubative regime of the earliest possible arrival times of the signal. We present two main results: First we find that, perhaps surprisingly, the analogue of amplitude modulated signalling (Alice using her energy eigenstates |g>, |e>, as in the Fermi problem) is generally sub-optimal for communication. Namely, e.g., phase modulated signalling (Alice using, e.g., |+>,|e>-states) overcomes the quantum noise already at a lower order in perturbation theory. Second, we study the effect of mode truncations that are commonly used in cavity QED on the modelling of the communication between two-level atoms. We show that, on general grounds, namely for causality to be preserved, the UV cutoff must scale at least polynomially with the desired accuracy of the predictions.

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