Electronic and photonic counting statistics as probes of non-equilibrium quantum dynamics

Electronic and photonic counting statistics as probes of non-equilibrium quantum dynamics
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电子和光子计数统计作为非平衡量子动力​​学的探针

DOI:
10.1088/1367-2630/ab6eb0
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发表时间:
2016
影响因子:
3.3
通讯作者:
A. Armour
A. Armour
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
B. Kubala;J. Ankerhold;A. Armour

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我们分析了与电压偏置约瑟夫森结耦合的微波腔内光子进出的全计数统计(FCS)。库珀对的隧穿产生相干的光子流进入腔内,同时光子也可以非相干地泄漏出去。我们用一种非常一般的幺正变换方法证明了在长时间限制下,电荷的FCS与光子之间存在简单的联系,揭示了所有相干过程和非相干过程的累积量在该限制下都是匹配的。我们还探讨了由于系统的强非线性动力学而产生的电荷和光子计数统计中的一些有趣的特征。其中包括与相干输运的出现相关的非常狭窄的分布,以及对离开腔的奇数或偶数光子的计数可能导致腔内出现强烈的非经典猫态的制度。
We analyse the full counting statistics (FCS) of photons flowing in and out of a microwave cavity coupled to a voltage-biased Josephson junction. Tunnelling of Cooper pairs generates a coherent flow of photons into the cavity whilst at the same time photons can also leak out incoherently. We use a very general unitary transformation method to demonstrate that there is a simple connection between the FCS of the charges and the photons in the long time limit, revealing that all the cumulants of the coherent and the incoherent processes match in that limit. We also explore some of the interesting features in the counting statistics of the charges and photons which arise from the strongly nonlinear dynamics of the system. These include very narrow distributions associated with the emergence of coherent transport and regimes where counting of either an odd or an even number of photons leaving the cavity can result in strongly non-classical cat states within the cavity.
谐振器介导的双库珀对隧道效应和光发射理论
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