Microwave-Based Quantum Control and Coherence Protection of Tin-Vacancy Spin Qubits in a Strain-Tuned Diamond-Membrane Heterostructure
Microwave-Based Quantum Control and Coherence Protection of Tin-Vacancy Spin Qubits in a Strain-Tuned Diamond-Membrane Heterostructure
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DOI：
10.1103/physrevx.13.041037
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发表时间：
2023-07
影响因子：
12.5
通讯作者：
Xinghan Guo;A. Stramma;Zixi Li;W. Roth;B. Huang;Yu-Ming Jin;Ryan A. Parker;Jesús Arjona Martínez-Jesús-Ar
中科院分区：
文献类型：
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作者：
Xinghan Guo;A. Stramma;Zixi Li;W. Roth;B. Huang;Yu-Ming Jin;Ryan A. Parker;Jesús Arjona Martínez-Jesús-Ar
固体中强大的自旋光子界面是量子网络和传感技术的重要组成部分。理想情况下，这些接口结合了长寿命的自旋存储器、相干光学跃迁、快速和高保真自旋操纵以及简单的设备集成和缩放。金刚石中的锡空位中心 (SnV) 是一种很有前景的自旋光子界面，在 1.7 K 下具有理想的光学和自旋特性。然而，SnV 自旋缺乏有效的微波控制，并且其自旋相干性会随着温度的升高而降低。在这项工作中，我们引入了一个克服这些挑战的新平台——均匀应变金刚石薄膜中的 SnV 中心。晶体应变的受控生成引入了轨道混合，允许微波控制自旋态，具有 99.36(9)% 的门保真度和超过毫秒的自旋相干保护。此外，晶体应变的存在抑制了温度依赖性相移过程，从而使相干时间显着改善，在 4 K 下可达 223(10) ${\mu}$s，这是常见低温系统中广泛使用的温度。重要的是，光学跃迁的相干性不受高温的影响，表现出几乎寿命有限的光学线宽。结合金刚石膜与器件集成的兼容性，所演示的平台是未来量子技术的理想自旋光子接口。
Robust spin-photon interfaces in solids are essential components in quantum networking and sensing technologies. Ideally, these interfaces combine a long-lived spin memory, coherent optical transitions, fast and high-fidelity spin manipulation, and straightforward device integration and scaling. The tin-vacancy center (SnV) in diamond is a promising spin-photon interface with desirable optical and spin properties at 1.7 K. However, the SnV spin lacks efficient microwave control and its spin coherence degrades with higher temperature. In this work, we introduce a new platform that overcomes these challenges - SnV centers in uniformly strained thin diamond membranes. The controlled generation of crystal strain introduces orbital mixing that allows microwave control of the spin state with 99.36(9) % gate fidelity and spin coherence protection beyond a millisecond. Moreover, the presence of crystal strain suppresses temperature dependent dephasing processes, leading to a considerable improvement of the coherence time up to 223(10) ${\mu}$s at 4 K, a widely accessible temperature in common cryogenic systems. Critically, the coherence of optical transitions is unaffected by the elevated temperature, exhibiting nearly lifetime-limited optical linewidths. Combined with the compatibility of diamond membranes with device integration, the demonstrated platform is an ideal spin-photon interface for future quantum technologies.