Optical holonomic single quantum gates with a geometric spin under a zero field
Optical holonomic single quantum gates with a geometric spin under a zero field
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DOI：
10.1038/nphoton.2017.40
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发表时间：
2017-04
期刊：
影响因子：
35
通讯作者：
Y. Sekiguchi;Naeko Niikura;Ryota Kuroiwa;Hiroki Kano;H. Kosaka
中科院分区：
文献类型：
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作者：
Y. Sekiguchi;Naeko Niikura;Ryota Kuroiwa;Hiroki Kano;H. Kosaka
在单自旋上实现快速容错量子门是固态量子信息处理的核心要求。由于偏振光表现出几何干涉，自旋相干性也通过自旋-轨道相互作用与光进行几何控制。在这里，我们表明，在一个退化的子空间中的自旋为1的电子系统的几何自旋下，在钻石中的氮空位中心的零场允许实现光学非绝热完整量子门。在准共振光照射下的几何自旋在自旋轨道空间中经历循环演化，并获得几何相位或完整性，其导致绕任意轴旋转由光偏振和失谐定义的任何角度。这使得通用完整量子门与一个单一的操作。我们使用几何自旋制备和读出技术演示了一套完整的泡利量子门。新方案为完整量子计算机和中继器开辟了道路。
The realization of fast fault-tolerant quantum gates on a single spin is the core requirement for solid-state quantum-information processing. As polarized light shows geometric interference, spin coherence is also geometrically controlled with light via the spin–orbit interaction. Here, we show that a geometric spin in a degenerate subspace of a spin-1 electronic system under a zero field in a nitrogen vacancy centre in diamond allows implementation of optical non-adiabatic holonomic quantum gates. The geometric spin under quasi-resonant light exposure undergoes a cyclic evolution in the spin–orbit space, and acquires a geometric phase or holonomy that results in rotations about an arbitrary axis by any angle defined by the light polarization and detuning. This enables universal holonomic quantum gates with a single operation. We demonstrate a complete set of Pauli quantum gates using the geometric spin preparation and readout techniques. The new scheme opens a path to holonomic quantum computers and repeaters.