Observation of dark states in a superconductor diamond quantum hybrid system

Xiaobo Zhu, Yuichiro Matsuzaki, Robert Amsüss, Kosuke Kakuyanagi, Takaaki Shimo-Oka, Norikazu Mizuochi, Kae Nemoto, Kouichi Semba, William J. Munro and Shiro Saito ()
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Xiaobo Zhu: NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato-Wakamiya
Yuichiro Matsuzaki: NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato-Wakamiya
Robert Amsüss: NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato-Wakamiya
Kosuke Kakuyanagi: NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato-Wakamiya
Takaaki Shimo-Oka: Graduate School of Engineering Science, Osaka University
Norikazu Mizuochi: Graduate School of Engineering Science, Osaka University
Kae Nemoto: National Institute of Informatics
Kouichi Semba: NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato-Wakamiya
William J. Munro: NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato-Wakamiya
Shiro Saito: NTT Basic Research Laboratories, NTT Corporation, 3-1 Morinosato-Wakamiya

Nature Communications, 2014, vol. 5, issue 1, 1-6

Abstract: Abstract The hybridization of distinct quantum systems has opened new avenues to exploit the best properties of these individual systems. Superconducting circuits and electron spin ensembles are one such example. Strong coupling and the coherent transfer and storage of quantum information has been achieved with nitrogen vacancy centres in diamond. Recently, we have observed a remarkably sharp resonance (~1 MHz) at 2.878 GHz in the spectrum of flux qubit negatively charged nitrogen vacancy diamond hybrid quantum system under zero external magnetic field. This width is much narrower than that of both the flux qubit and spin ensemble. Here we show that this resonance is evidence of a collective dark state in the ensemble, which is coherently driven by the superposition of clockwise and counter-clockwise macroscopic persistent supercurrents flowing in the flux qubit. The collective dark state is a unique physical system and could provide a long-lived quantum memory.

Date: 2014
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DOI: 10.1038/ncomms4524

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