Keeping a Single Qubit Alive by Experimental Dynamic Decoupling

Details Keeping a Single Qubit Alive by Experimental Dynamic Decoupling Keeping a Single Qubit Alive by Experimental Dynamic Decoupling

2010-09-30

arxiv.org/abs/1009.6189v2

J. Phys. B: At. Mol. Opt. Phys. 44 (2011) 025501

Physics

Quantum Physics

5 pages, 5 figures

Scientific paper

10.1088/0953-4075/44/2/025501

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 pi-pulses is identical to the Uhrig dynamic decoupling (UDD) sequence. We compare UDD and CPMG sequences applied to a single Ca-43 trapped-ion qubit and find that they afford comparable protection in our ambient noise environment.

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