Publications by Andrew Steane


Keeping a single qubit alive by experimental dynamic decoupling

Journal of Physics B: Atomic, Molecular and Optical Physics 44 (2011)

DJ Szwer, SC Webster, AM Steane, DM Lucas

We demonstrate the use of dynamic decoupling techniques to extend the coherence time of a single memory qubit by nearly two orders of magnitude. By extending the Hahn spin-echo technique to correct for unknown, arbitrary polynomial variations in the qubit precession frequency, we show analytically that the required sequence of π-pulses is identical to the Uhrig dynamic decoupling (UDD) sequence. We compare UDD and Carr-Purcell-Meiboom-Gill (CPMG) sequences applied to a single 43Ca+ trapped-ion qubit and find that they afford comparable protection in our ambient noise environment. © 2011 IOP Publishing Ltd.


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