Coherent coupling of a superconducting flux qubit to an electron spin ensemble in diamond
Coherent coupling of a superconducting flux qubit to an electron spin ensemble in diamond
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DOI：
10.1038/nature10462
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发表时间：
2011-10-13
期刊：
影响因子：
64.8
通讯作者：
Semba, Kouichi
中科院分区：
文献类型：
--
作者：
Zhu, Xiaobo;Saito, Shiro;Semba, Kouichi
During the past decade, research into superconducting quantum bits (qubits) based on Josephson junctions has made rapid progress(1). Many foundational experiments have been performed(2-8), and superconducting qubits are now considered one of the most promising systems for quantum information processing. However, the experimentally reported coherence times are likely to be insufficient for future large-scale quantum computation. A natural solution to this problem is a dedicated engineered quantum memory based on atomic and molecular systems. The question of whether coherent quantum coupling is possible between such natural systems and a single macroscopic artificial atom has attracted considerable attention(9-12) since the first demonstration of macroscopic quantum coherence in Josephson junction circuits(2). Here we report evidence of coherent strong coupling between a single macroscopic superconducting artificial atom (a flux qubit) and an ensemble of electron spins in the form of nitrogen-vacancy colour centres in diamond. Furthermore, we have observed coherent exchange of a single quantum of energy between a flux qubit and a macroscopic ensemble consisting of about 3 x 10(7) such colour centres. This provides a foundation for future quantum memories and hybrid devices coupling microwave and optical systems.
