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 29.10.2009   Карта сайта     Language По-русски По-английски
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29.10.2009

 


Nature 461, 1265-1268 (29 October 2009) | doi:10.1038/nature08470; Received 17 June 2009; Accepted 27 August 2009



Preserving electron spin coherence in solids by optimal dynamical decoupling


Jiangfeng Du1, Xing Rong1, Nan Zhao2, Ya Wang1, Jiahui Yang1 & R. B. Liu2




  1. Hefei National Laboratory for Physical Sciences at Microscale and Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026, China

  2. Department of Physics, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China


Correspondence to: Jiangfeng Du1R. B. Liu2 Correspondence and requests for materials should be addressed to J.D. (Email: djf@ustc.edu.cn) or R.B.L. (Email: rbliu@phy.cuhk.edu.hk).





To exploit the quantum coherence of electron spins in solids in future technologies such as quantum computing1, 2, it is first vital to overcome the problem of spin decoherence due to their coupling to the noisy environment. Dynamical decoupling3, 4, 5, 6, 7, 8, 9, which uses stroboscopic spin flips to give an average coupling to the environment that is effectively zero, is a particularly promising strategy for combating decoherence because it can be naturally integrated with other desired functionalities, such as quantum gates. Errors are inevitably introduced in each spin flip, so it is desirable to minimize the number of control pulses used to realize dynamical decoupling having a given level of precision. Such optimal dynamical decoupling sequences have recently been explored9, 10, 11, 12. The experimental realization of optimal dynamical decoupling in solid-state systems, however, remains elusive. Here we use pulsed electron paramagnetic resonance to demonstrate experimentally optimal dynamical decoupling for preserving electron spin coherence in irradiated malonic acid crystals at temperatures from 50 K to room temperature. Using a seven-pulse optimal dynamical decoupling sequence, we prolonged the spin coherence time to about 30 mus; it would otherwise be about 0.04 mus without control or 6.2 mus under one-pulse control. By comparing experiments with microscopic theories, we have identified the relevant electron spin decoherence mechanisms in the solid. Optimal dynamical decoupling may be applied to other solid-state systems, such as diamonds with nitrogen-vacancy centres13, 14, 15, and so lay the foundation for quantum coherence control of spins in solids at room temperature.



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  • Chen Wev .  honorary member of ISSC science council

  • Harton Vladislav Vadim  honorary member of ISSC science council

  • Lichtenstain Alexandr Iosif  honorary member of ISSC science council

  • Novikov Dimirtii Leonid  honorary member of ISSC science council

  • Yakushev Mikhail Vasilii  honorary member of ISSC science council

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