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arXiv 1804.03095quant-phcond-mat.othermath-phmath.MPphysics.optics
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高斯量子信道的精确非马尔可夫动力学:瞬时和渐近态

Exact non-Markovian dynamics of Gaussian quantum channels: Finite-time and asymptotic regimes

Gianpaolo Torre, Fabrizio Illuminati

摘要:

我们研究了高斯量子信道的马尔可夫和非马尔可夫动力学,利用最近引入的一个必要和充分的标准和随后的措施的非马尔可夫性的基础上违反可分性的动力学映射。我们比较了量子布朗运动(QBM)和纯阻尼(PD)通道的典型实例,对于前者,我们发现,对于任何非马尔可夫参数的非零值,精确的动力学演化总是在有限时间以及在渐近状态下的非马尔可夫。如果诉诸旋转波近似(RWA)形式的QBM,忽略了异常扩散的系统动力学的贡献,我们表明,这种近似未能检测到的非马尔可夫性质的动态。最后,对于量子BM在渐近态下的精确动力学,我们证明了基于量子态之间的可交换性的非马尔可夫性的量词不能检测到动力学的非马尔可夫性质。

英文摘要:

We investigate the Markovian and non-Markovian dynamics of Gaussian quantum channels, exploiting a recently introduced necessary and sufficient criterion and the ensuing measure of non-Markovianity based on the violation of the divisibility property of the dynamical map. We compare the paradigmatic instances of Quantum Brownian motion (QBM) and Pure Damping (PD) channels, and for the former we find that the exact dynamical evolution is always non-Markovian in the finite-time as well as in the asymptotic regimes, for any nonvanishing value of the non-Markovianity parameter. If one resorts to the rotating wave approximated (RWA) form of the QBM, that neglects the anomalous diffusion contribution to the system dynamics, we show that such approximation fails to detect the non-Markovian nature of the dynamics. Finally, for the exact dynamics of the QBM in the asymptotic regime, we show that the quantifiers of non-Markovianity based on the distinguishability between quantum states fail to detect the non-Markovian nature of the dynamics.

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