Multi-target-qubit unconventional geometric phase gate in a multi-cavity system.
Multi-target-qubit unconventional geometric phase gate in a multi-cavity system.
复制标题
多腔系统中的多目标量子位非常规几何相位门
DOI：
10.1038/srep21562
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发表时间：
2016-02-22
影响因子：
4.6
通讯作者：
Yang CP
中科院分区：
文献类型：
--
作者：
Liu T;Cao XZ;Su QP;Xiong SJ;Yang CP
基于腔的大规模量子信息处理（QIP）可能涉及多个腔，并且需要对分布在不同腔中的量子比特执行各种量子逻辑操作。基于几何相位的量子计算近年来引起了人们的广泛关注，它具有克服不准确性和局部波动的优势。此外，多量子比特门特别有吸引力，并在QIP中发挥重要作用。本文提出了一种在多腔系统中实现多目标量子比特非常规几何相位门的简单有效的方案。这种多量子位相位门具有一个共同的控制量子位，但不同的目标量子位分布在不同的腔中，这可以使用单步操作来实现。门操作时间与量子比特的数量无关，并且每个量子比特只需要两个级别。这种多量子比特门是通用的，例如，通过执行单量子位操作，它可以被转换成在QIP中有用的两种类型的有效多目标量子位相位门。该建议是相当普遍的，它可以用来完成相同的任务，为一般类型的量子比特，如原子，NV中心，量子点和超导量子比特。
Cavity-based large scale quantum information processing (QIP) may involve multiple cavities and require performing various quantum logic operations on qubits distributed in different cavities. Geometric-phase-based quantum computing has drawn much attention recently, which offers advantages against inaccuracies and local fluctuations. In addition, multiqubit gates are particularly appealing and play important roles in QIP. We here present a simple and efficient scheme for realizing a multi-target-qubit unconventional geometric phase gate in a multi-cavity system. This multiqubit phase gate has a common control qubit but different target qubits distributed in different cavities, which can be achieved using a single-step operation. The gate operation time is independent of the number of qubits and only two levels for each qubit are needed. This multiqubit gate is generic, e.g., by performing single-qubit operations, it can be converted into two types of significant multi-target-qubit phase gates useful in QIP. The proposal is quite general, which can be used to accomplish the same task for a general type of qubits such as atoms, NV centers, quantum dots and superconducting qubits.