Single-shot realization of nonadiabatic holonomic quantum gates in decoherence-free subspaces
Single-shot realization of nonadiabatic holonomic quantum gates in decoherence-free subspaces
复制标题
无退相干子空间中非绝热完整量子门的单次实现
DOI：
10.1103/physreva.95.062310
复制
发表时间：
2017-06
影响因子：
2.9
通讯作者：
D. M. Tong
中科院分区：
文献类型：
--
作者：
P. Z. Zhao;G. F. Xu;Q. M. Ding;E. Sjöqvist;D. M. Tong
无退相干子空间中的非绝热完整量子计算由于能够实现高速计算，并且结合了完整门的鲁棒性和无退相干子空间的相干稳定性，近年来引起了越来越多的关注。自第一个无退相干子空间的非绝热完整量子计算协议提出以来，人们提出了许多物理实现方案。然而，以前的方案都需要两个非交换门来实现任意的一量子位门，这使得门对错误源的暴露时间和资源消耗增加了一倍。本文提出了一种在无退相干子空间中进行非绝热完整量子计算的替代协议，该协议通过单次实现实现无退相干子空间中的任意单量子比特门。该协议既保留了原协议的优点，又避免了将两个门组合在一起实现任意一个量子位门的额外工作，从而减少了对各种错误源的暴露时间。
Nonadiabatic holonomic quantum computation in decoherence-free subspaces has attracted increasing attention recently, as it allows for high-speed implementation and combines both the robustness of holonomic gates and the coherence stabilization of decoherence-free subspaces. Since the first protocol of nonadiabatic holonomic quantum computation in decoherence-free subspaces, a number of schemes for its physical implementation have been put forward. However, all previous schemes require two noncommuting gates to realize an arbitrary one-qubit gate, which doubles the exposure time of gates to error sources as well as the resource expenditure. In this paper, we propose an alternative protocol for nonadiabatic holonomic quantum computation in decoherence-free subspaces, in which an arbitrary one-qubit gate in decoherence-free subspaces is realized by a single-shot implementation. The present protocol not only maintains the merits of the original protocol, but also avoids the extra work of combining two gates to implement an arbitrary one-qubit gate and thereby reduces the exposure time to various error sources.