Salhov Alon, Cao Qingyun, Cai Jianming, Retzker Alex, Jelezko Fedor, Genov Genko
Racah Institute of Physics, The Hebrew University of Jerusalem, Jerusalem, 91904, Givat Ram, Israel.
Institute for Quantum Optics, Ulm University, Albert-Einstein-Allee 11, 89081 Ulm, Germany.
Phys Rev Lett. 2024 May 31;132(22):223601. doi: 10.1103/PhysRevLett.132.223601.
Decoherence and imperfect control are crucial challenges for quantum technologies. Common protection strategies rely on noise temporal autocorrelation, which is not optimal if other correlations are present. We develop and demonstrate experimentally a strategy that uses the cross-correlation of two noise sources. Utilizing destructive interference of cross-correlated noise extends the coherence time tenfold, improves control fidelity, and surpasses the state-of-the-art sensitivity for high frequency quantum sensing, significantly expanding the applicability of noise protection strategies.
退相干和不完善控制是量子技术面临的关键挑战。常见的保护策略依赖于噪声时间自相关，而当存在其他相关性时，这种方法并非最优。我们开发并通过实验证明了一种利用两个噪声源互相关的策略。利用互相关噪声的相消干涉将相干时间延长了十倍，提高了控制保真度，并超越了高频量子传感的当前灵敏度，显著扩展了噪声保护策略的适用性。
