We experimentally demonstrate the strong suppression of dephasing of a qubit stored in a single \textsuperscript{87}Rb atom in an optical dipole trap by using Carr-Purcell-Meiboom-Gill(CPMG) pulse sequences. Regarded as a repetition of spin echo, CPMG sequence is an optimal choice for suppressing both inhomogeneous and homogeneous phase decoherence mechanisms. In the trap with 830 nm wavelength and 0.7 mK potential depth, the spin relaxation time of single atoms is showed to be 830.8 ms. We obtain the reversible inhomogeneous dephasing time of $T_{2}^{\ast}$=1.4 ms. The homogeneous dephasing time is $T_{2}^{\prime}$ =102.7 ms in the spin echo process, by employing CPMG sequence with pulse number n = 6 the homogeneous dephasing is further suppressed by a factor of 3, and its corresponding coherence time is extended to $T_{2}^{\prime}$=304.5 ms.
Quantum decoherence of nitrogen-vacancy spin ensembles in a nitrogen spin bath in diamond under dynamical decoupling
SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University(成均馆大学 SKKU 纳米技术高级研究所);Department of Physics and Department of Energy Systems Research, Ajou University(亚洲大学物理系与能源系统研究部);Pritzker School of Molecular Engineering, University of Chicago(芝加哥大学普里茨克分子工程学院);Center for Quantum Information, Korea Institute of Science and Technology(韩国科学技术院量子信息中心);Division of Nano and Information Technology, KIST School, Korea University of Science and Technology(韩国科学技术院 KIST 学院纳米与信息技术分部);Department of Chemistry, University of Chicago(芝加哥大学化学系);Center for Molecular Engineering and Materials Science Division, Argonne National Laboratory(阿贡国家实验室分子工程与材料科学中心);Department of Quantum Information Engineering, Sungkyunkwan University(成均馆大学量子信息工程系)
Dynamical decoupling of a quantum dot spin in a micropillar cavity for spin-multiphoton entanglement
Université Paris-Saclay(巴黎萨克雷大学);Centre de Nanosciences et de Nanotechnologies, CNRS(国家科学研究中心纳米科学和纳米技术研究中心);Quandela SAS(Quandela公司);Johns Hopkins Applied Physics Laboratory(约翰斯·霍普金斯大学应用物理实验室);University of Delaware(特拉华大学)
Three-axis Active Magnetic Compensation with Spatial Feedforward Matrix Decoupling and Hysteresis PI Regulation for Suppressing Zeeman Decoherence of Cold Atom Quantum Memories
North University of China(中北大学);Shanxi Dazhong electronic information Industry Group Co., LTD.(山西大众电子信息产业集团有限公司)
Experimental Uhrig Dynamical Decoupling using Trapped Ions
我们提出了一个详细的实验研究的Uhrig动态解耦(UDD)序列在各种噪声环境中。我们的量子位系统由限制在潘宁陷阱中的$^{9}$ Be $^{+}$离子的晶体阵列组成。我们使用电子自旋翻转跃迁作为我们的量子位流形,并使用124 GHz的微波系统驱动量子位旋转。我们研究了UDD序列在减轻相位误差的效果,并与众所周知的CPMG式多脉冲自旋回波作为脉冲数,旋转轴,噪声谱和噪声强度的函数进行比较。我们的结果与经典相位噪声下量子比特退相干的理论预测一致,考虑了有限持续时间$π$脉冲的影响。最后,我们证明了Uhrig序列是更强大的对系统的过/欠旋转和失谐误差比多脉冲自旋回波,尽管精确的处方脉冲定时在UDD。
Dynamically suppressing cavity dephasing induced by frequency fluctuations of a coupled nonlinear mode
Northwestern University(西北大学);Fermi National Accelerator Laboratory(费米国家加速器实验室);Amazon Center for Quantum Computing(亚马逊量子计算中心);Stanford University(斯坦福大学)
The origins of noise in the Zeeman splitting of spin qubits in natural-silicon devices
RIKEN, Center for Quantum Computing (RQC)(理化学研究所量子计算中心);RIKEN, Center for Emergent Matter Science (CEMS)(理化学研究所涌现物质科学中心);Slovak Academy of Sciences, Institute of Physics(斯洛伐克科学院物理研究所);Tokyo Institute of Technology, Tokyo Tech Academy for Super Smart Society(东京工业大学超级智慧社会学院);Department of Physics, University of Basel(巴塞尔大学物理系)
Decoherence Resilience of the Non-Hermitian Skin Effect
Anhui University(安徽大学);Southeast University(东南大学);Politecnico di Milano(米兰理工大学);IFISC (UIB-CSIC), Instituto de Fisica Interdisciplinary Sistemas Complejos(复杂系统跨物理研究所 (UIB-CSIC))
Enhancing Coherence with a Clock Transition and Dynamical Decoupling in the Cr$_7$Mn Molecular Nanomagnet
Amherst College(阿默斯特学院);University of Massachusetts Amherst(马萨诸塞大学阿默斯特分校);Dartmouth College(达特茅斯学院);Brown University(布朗大学);Hamilton College(汉密尔顿学院);Center for Integrated Nanotechnologies, Sandia National Laboratories(桑迪亚国家实验室集成纳米技术中心);The University of Manchester(曼彻斯特大学);University of Hawai‘i at Mānoa(夏威夷大学马诺阿分校)
Analytical blueprint for 99.999% fidelity X-gates on present superconducting hardware under strong driving
Institute for Quantum Control (PGI-8), Forschungszentrum Jülich(于利希研究中心量子控制研究所);Institute for Theoretical Physics, University of Cologne(科隆大学理论物理研究所);Institute for Functional Quantum System (PGI-13), Forschungszentrum Jülich(于利希研究中心功能量子系统研究所);Department of Physics, RWTH Aachen University(亚琛工业大学物理系)
Electrical Control for Extension of Ramsey Spin Coherence Time of Ion-Implanted Nitrogen Vacancy Centers in diamond
自旋相干时间的延长是量子信息和量子传感的关键问题。在固态系统中,已经证明了用各种技术抑制噪声。另一方面,用于抑制的电控制对于片上量子信息器件的单独控制是重要的。在这里,我们展示了电子控制的40 nm深的离子注入的单氮空位中心自旋的自旋相干时间的延长,通过抑制磁噪声。我们在两个间隔10微米的触点上施加120 V DC。自旋相干时间,估计从自由感应衰减和哈恩回波衰减,分别增加到约10倍(达到10微秒)和1.4倍(达到150微秒)。通过定量分析,阐明了静电电场对退相干的影响。用于延伸的电控制可以提供对温度、压力和电场(但不是磁场)的DC感测的灵敏度增强,从而在固态量子信息器件中开辟了一种新技术。