Exchange-Only Dynamical Decoupling in the 3-Qubit Decoherence Free Subsystem
Abstract
The Uhrig dynamical decoupling sequence achieves high-order decoupling of a single system qubit from its dephasing bath through the use of bang-bang Pauli pulses at appropriately timed intervals. High-order decoupling of single and multiple qubit systems from baths causing both dephasing and relaxation can also be achieved through the nested application of Uhrig sequences, again using single-qubit Pauli pulses. For the 3-qubit decoherence free subsystem (DFS) and related subsystem encodings, Pauli pulses are not naturally available operations; instead, exchange interactions provide all required encoded operations. Here we demonstrate that exchange interactions alone can achieve high-order decoupling against general noise in the 3-qubit DFS. We present decoupling sequences for a 3-qubit DFS coupled to classical and quantum baths and evaluate the performance of the sequences through numerical simulations.
Cite
@article{arxiv.1203.4296,
title = {Exchange-Only Dynamical Decoupling in the 3-Qubit Decoherence Free Subsystem},
author = {Jacob R. West and Bryan H. Fong},
journal= {arXiv preprint arXiv:1203.4296},
year = {2013}
}