Optimized Dynamical Decoupling in a Model Quantum Memory

Published

April 23, 2009

Author(s)

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

Abstract

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.

Citation

Science

Volume

458

Pub Type

Journals

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Keywords

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

Citation

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], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=901161 (Accessed January 2, 2025)