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arXiv quant-ph/0410066quant-ph
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具有均匀控制的单量子比特门的量子线路

Quantum circuits with uniformly controlled one-qubit gates

Ville Bergholm, Juha J. Vartiainen, Mikko Mottonen, Martti M. Salomaa

摘要:

均匀控制的单量子位门是量子门,其可以表示为作用于单个量子位的二维么正算子的直和。我们提出了一个量子门阵列,它使用最多2^{n-1} - 1个受控非门,2^{n-1}个单量子位门和一个对角n量子位门来实现这种类型的任何n量子位门。该电路是基于所谓的量子多路复用器,我们提供了一个修改后的建设。我们说明了这些门的通用性,通过将它们应用到一个一般的n-量子位门和一个本地状态的准备过程的分解。此外,我们研究他们的实现仅使用最近邻门。我们给出了所有上述应用的单量子比特和受控非门计数的上界。在所有这四种情况下,所提出的电路拓扑结构要么改善或实现先前报道的上限的门数。因此,它们为目前已知的一般门分解提供了最有效的方法。

英文摘要:

Uniformly controlled one-qubit gates are quantum gates which can be represented as direct sums of two-dimensional unitary operators acting on a single qubit. We present a quantum gate array which implements any n-qubit gate of this type using at most 2^{n-1} - 1 controlled-NOT gates, 2^{n-1} one-qubit gates and a single diagonal n-qubit gate. The circuit is based on the so-called quantum multiplexor, for which we provide a modified construction. We illustrate the versatility of these gates by applying them to the decomposition of a general n-qubit gate and a local state preparation procedure. Moreover, we study their implementation using only nearest-neighbor gates. We give upper bounds for the one-qubit and controlled-NOT gate counts for all the aforementioned applications. In all four cases, the proposed circuit topologies either improve on or achieve the previously reported upper bounds for the gate counts. Thus, they provide the most efficient method for general gate decompositions currently known.

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