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Optimized Dynamical Decoupling in a Model Quantum Memory



Michael J. Biercuk, Hermann Uys, Aaron Vandevender, N. Shiga, Wayne M. Itano, David J. Wineland, John J. Bollinger


We demonstrate the efficacy of optimized dynamical decoupling pulse sequences in suppressing phase errors in a model quantum memory. Our experimental system consists of a crystalline array of trapped 9Be+ ions in which we drive a qubit transition at $\sim$124 GHz. We compare the recently developed Uhrig dynamical decoupling (UDD) sequence against multi-pulse spin echo (CPMG) in a variety of experimentally relevant, artificially synthesized noise environments. We develop a treatment to predict qubit decoherence in the presence of finite duration square pi pulses, and find strong agreement between experimental data and theoretical predictions. Finally, we produce locally optimized dynamical decoupling pulse sequences through active experimental feedback - a procedure which does not require any knowledge of the experimental noise environment - and find that these sequences outperform all others under test.


quantum computing, quantum information, quantum memory, dynamical decoupling, spin echo, decoherence, trapped ion


Biercuk, M. , Uys, H. , Vandevender, A. , Shiga, N. , Itano, W. , Wineland, D. and Bollinger, J. (2009), Optimized Dynamical Decoupling in a Model Quantum Memory, Science, [online], (Accessed April 17, 2024)
Created April 23, 2009, Updated February 19, 2017