Long-lived coherences in strongly interacting spin ensembles

IF 2.9 2区 物理与天体物理 Q2 Physics and Astronomy Physical Review A Pub Date : 2024-09-12 DOI:10.1103/physreva.110.032612
William K. Schenken, Simon A. Meynell, Francisco Machado, Bingtian Ye, Claire A. McLellan, Maxime Joos, V. V. Dobrovitski, Norman Y. Yao, Ania C. Bleszynski Jayich
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Abstract

Periodic driving has emerged as a powerful tool to control, engineer, and characterize many-body quantum systems. However, the required pulse sequences are often complex, long, or require the ability to control the individual degrees of freedom. In this work, we study how a simple Carr-Purcell–Meiboom-Gill (CPMG)-like pulse sequence can be leveraged to enhance the coherence of a large ensemble of spin qubits and serve as an important characterization tool. We implement the periodic drive on an ensemble of dense nitrogen-vacancy (NV) centers in diamond and examine the effect of pulse rotation offset as a control parameter on the dynamics. We use a single diamond sample prepared with several spots of varying NV density, which, in turn, varies the NV-NV dipolar interaction strength. Counterintuitively, we find that rotation offsets deviating from the ideal π pulse in the CPMG sequence (often classified as pulse errors) play a critical role in preserving coherence along an axis set by the π pulses even at nominally zero rotation offset. The cause of the coherence preservation is an emergent effective field that scales linearly with the magnitude of the rotation offset for small offsets. In addition to extending coherence, we compare the rotation offset dependence of coherence to numerical simulations to measure the disorder and dipolar contributions to the Hamiltonian to quantitatively extract the densities of the constituent spin species within the diamond.

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强相互作用自旋集合中的长效一致性
周期驱动已成为控制、设计和表征多体量子系统的有力工具。然而,所需的脉冲序列往往复杂、冗长,或需要控制单个自由度的能力。在这项工作中,我们研究了如何利用类似于卡尔-普塞尔-梅博姆-吉尔(CPMG)的简单脉冲序列来增强大型自旋量子比特集合的相干性,并将其作为一种重要的表征工具。我们在金刚石中的致密氮空位(NV)中心集合上实现了周期性驱动,并考察了脉冲旋转偏移作为控制参数对动力学的影响。我们使用单个金刚石样品制备了多个不同 NV 密度的点,这反过来又改变了 NV-NV 双极相互作用的强度。与直觉相反的是,我们发现偏离 CPMG 序列中理想 π 脉冲的旋转偏移(通常被归类为脉冲误差)在沿 π 脉冲设定的轴线保持相干性方面起着至关重要的作用,即使在名义上旋转偏移为零的情况下也是如此。保持相干性的原因是出现了一个有效场,它与小偏移量的旋转偏移量成线性比例。除了扩展相干性之外,我们还将相干性的旋转偏移依赖性与数值模拟进行了比较,以测量哈密顿的无序性和双极性贡献,从而定量提取金刚石中各自旋成分的密度。
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来源期刊
Physical Review A
Physical Review A 物理-光学
CiteScore
5.40
自引率
24.10%
发文量
0
审稿时长
2.2 months
期刊介绍: Physical Review A (PRA) publishes important developments in the rapidly evolving areas of atomic, molecular, and optical (AMO) physics, quantum information, and related fundamental concepts. PRA covers atomic, molecular, and optical physics, foundations of quantum mechanics, and quantum information, including: -Fundamental concepts -Quantum information -Atomic and molecular structure and dynamics; high-precision measurement -Atomic and molecular collisions and interactions -Atomic and molecular processes in external fields, including interactions with strong fields and short pulses -Matter waves and collective properties of cold atoms and molecules -Quantum optics, physics of lasers, nonlinear optics, and classical optics
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