J. -M. Cai, B. Naydenov, R. Pfeiffer, L. P. McGuinness, K. D. Jahnke, F. Jelezko, M. B. Plenio, A. Retzker
The loss of coherence is one of the main obstacles for the implementation of quantum information processing. The efficiency of dynamical decoupling schemes, which have been introduced to address this problem, is limited itself by the fluctuations in the driving fields which will themselves introduce noise. We address this challenge by introducing the concept of concatenated continuous dynamical decoupling, which can overcome not only external noise but also fluctuations in driving fields that implement the decoupling sequences and thus holds the potential for achieving relaxation limited coherence times. We implement the scheme experimentally with nitrogen-vacancy (NV) centers in diamond, and demonstrate an improvement of the coherence time by an order of magnitude. The proposed scheme can be applied to a wide variety of other physical systems including, trapped atoms and ions, quantum dots, and may be combined with other quantum technologies challenges such as quantum sensing and quantum information processing.
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http://arxiv.org/abs/1111.0930
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