超导体附近的冷原子：超出约翰逊噪声极限的原子自旋相干性
Cold atoms near superconductors: Atomic spin coherence beyond the Johnson noise limit
摘要：
本文报道了超导铌丝表面附近原子自旋相干性的测量。与正常导电金属表面相比，原子自旋相干性保持超过约翰逊噪声极限的时间段。这一结果为超导体附近的磁近场噪声被强抑制提供了实验依据。超导体附近原子自旋相干时间的延长为相干耦合冷原子/固态混合量子系统的发展开辟了道路，该系统在量子信息处理和精密力传感方面具有潜在的应用。
英文摘要：
We report on the measurement of atomic spin coherence near the surface of a superconducting niobium wire. As compared to normal conducting metal surfaces, the atomic spin coherence is maintained for time periods beyond the Johnson noise limit. The result provides experimental evidence that magnetic near field noise near the superconductor is strongly suppressed. Such long atomic spin coherence times near superconductors open the way towards the development of coherently coupled cold atom / solid state hybrid quantum systems with potential applications in quantum information processing and precision force sensing.
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