RSS icon
Twitter icon
Facebook icon
Vimeo icon
YouTube icon

Concatenated dynamical decoupling in a solid-state spin bath

TitleConcatenated dynamical decoupling in a solid-state spin bath
Publication TypeJournal Article
Year of Publication2007
AuthorsW. M. Witzel, and S. Das Sarma
JournalPhys. Rev. B
Volume76
Date Publisheddec
ISSN1098-0121
Keywords2007, Single Fellow
Abstract

Concatenated dynamical decoupling (CDD) pulse sequences hold much promise as a strategy to mitigate decoherence in quantum information processing. It is important to investigate the actual performance of these dynamical decoupling strategies in real systems that are promising qubit candidates. In this Rapid Communication, we compute the echo decay of concatenations of the Hahn echo sequence for a solid-state electronic spin qubit in a nuclear spin bath using a cluster expansion technique. We find that each level of concatenation reverses the effect of successive levels of intrabath fluctuations. On the one hand, this advances CDD as a versatile and realistic decoupling strategy. On the other hand, this invalidates, as overly optimistic, results of the simple pair approximation used previously to study restoration, through CDD, of coherence lost to a mesoscopic spin bath.

URLhttp://arxiv.org/abs/0707.1037

Subscribe to A Quantum Bit 

Quantum physics began with revolutionary discoveries in the early twentieth century and continues to be central in today’s physics research. Learn about quantum physics, bit by bit. From definitions to the latest research, this is your portal. Subscribe to receive regular emails from the quantum world. Previous Issues...

Sign Up Now

Sign up to receive A Quantum Bit in your email!

 Have an idea for A Quantum Bit? Submit your suggestions to jqi-comm@umd.edu