Manipulating the Majorana qubit with Landau-Zener-Stuckelberg interference
Manipulating the Majorana qubit with Landau-Zener-Stuckelberg interference
复制标题
利用朗道-齐纳-施塔克伯格干涉操纵马约拉纳量子位
DOI：
10.1103/physreva.92.012308
复制
发表时间：
2015-07-08
影响因子：
2.9
通讯作者：
Wang, Zhi
中科院分区：
文献类型：
--
作者：
Huang, Wen-Chao;Liang, Qi-Feng;Wang, Zhi
构建马约拉纳量子比特的通用运算方案仍然是拓扑量子计算的核心问题。我们研究了马约拉纳量子比特中的Landau-Zener-Stuckelberg干涉，并证明了这种干涉可以用于实现可控操作。马约拉纳量子比特由一个射频超导量子干涉器件（SQUID）组成，该器件具有具有马约拉纳束缚态的拓扑纳米线约瑟夫森结。在SQUID中，磁通量脉冲可以驱动马约拉纳量子比特的量子演化。当脉冲的振幅在超导通量量子h/2e附近调谐时，量子比特经历了两次朗道-齐纳跃迁。两个跃迁之间的Landau-Zener-Stuckelberg干涉旋转了马约拉纳量子比特，其角度由脉冲的时间尺度控制。这种旋转操作在马约拉纳量子比特上实现了高速单量子比特门，这是拓扑量子计算的必要组成部分。
Constructing a universal operation scheme for Majorana qubits remains a central issue for the topological quantum computation. We study the Landau-Zener-Stuckelberg interference in a Majorana qubit and show that this interference can be used to achieve controllable operations. The Majorana qubit consists of an rf superconducting quantum interference device (SQUID) with a topological nanowire Josephson junction which hosts Majorana bound states. In the SQUID, a magnetic flux pulse can drive the quantum evolution of the Majorana qubit. The qubit experiences two Landau-Zener transitions when the amplitude of the pulse is tuned around the superconducting flux quanta h/2e. The Landau-Zener-Stuckelberg interference between the two transitions rotates the Majorana qubit, with the angle controlled by the time scale of the pulse. This rotation operation implements a high-speed single-qubit gate on the Majorana qubit, which is a necessary ingredient for the topological quantum computation.