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arXiv 2203.13451quant-ph
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量子动力学不是严格的二分的

Quantum dynamics is not strictly bidivisible

David Davalos, Mario Ziman

摘要:

我们解决的问题,存在的量子信道,可分为两个量子信道,但不是在三个或更一般地说,通道可分为$n$,但不是在$n+1$部分。我们表明,对于量子比特的这些通道\textit{do not}存在,而一般的有限维量子信道,同样成立,至少为全克劳斯秩通道。为了证明这些结果,我们引入了一种新的量子信道的分解,它将它们分成边界部分和马尔可夫部分,并且它对任何有限维都成立。此外,引入的分解相当于量子动力学映射的可除性类和实现类型之间的公知连接,并且可以用于使用较小的量子寄存器来实现量子信道。

英文摘要:

We address the question of the existence of quantum channels that are divisible in two quantum channels but not in three or, more generally, channels divisible in $n$ but not in $n+1$ parts. We show that for the qubit those channels \textit{do not} exist, whereas for general finite-dimensional quantum channels the same holds at least for full Kraus rank channels. To prove these results, we introduce a novel decomposition of quantum channels which separates them into a boundary and Markovian part, and it holds for any finite dimension. Additionally, the introduced decomposition amounts to the well-known connection between divisibility classes and implementation types of quantum dynamical maps, and can be used to implement quantum channels using smaller quantum registers.

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