Optimize Noise Filtration through Dynamical Decoupling

Published

July 24, 2009

Author(s)

Hermann Uys, Michael J. Biercuk, John J. Bollinger

Abstract

One approach to maintaining phase coherence of qubits through dynamical decoupling consists of applying a sequence of Hahn spin-echo pulses. Recent studies have shown that, in certain noise environments, judicious choice of the delay times between these pulses can greatly improve the suppression of phase errors compared to traditional approaches. By enforcing a simple analytical condition we obtain sets of optimized dynamical decoupling sequences that are universal in that they are spectrum-independent up to a single scaling factor set by the coherence time of the system. We demonstrate the efficacy of these sequences in suppressing phase errors through experimental measurements on ^9Beu+ ion qubits in a Penning trap. Our combined theoretical and experimental studies show that in high-frequency-dominated noise environments this approach has the potential to suppress phase errors orders of magnitude more efficiently than comparable techniques.

Citation

Physical Review Letters

Volume

103

Pub Type

Journals

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Keywords

decoherence, dynamical decoupling, Penning ion trap, quantum information, spin-echo

Citation

Uys, H. , Biercuk, M. and Bollinger, J. (2009), Optimize Noise Filtration through Dynamical Decoupling, Physical Review Letters, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=902332 (Accessed April 19, 2024)