Decoherence of an $n$-qubit quantum memory
量子物理
2008-01-18 v1
摘要
We analyze decoherence of a quantum register in the absence of non-local operations i.e. of non-interacting qubits coupled to an environment. The problem is solved in terms of a sum rule which implies linear scaling in the number of qubits. Each term involves a single qubit and its entanglement with the remaining ones. Two conditions are essential: first decoherence must be small and second the coupling of different qubits must be uncorrelated in the interaction picture. We apply the result to a random matrix model, and illustrate its reach considering a GHZ state coupled to a spin bath.
引用
@article{arxiv.quant-ph/0703190,
title = {Decoherence of an $n$-qubit quantum memory},
author = {Thomas Gorin and Carlos Pineda and Thomas H. Seligman},
journal= {arXiv preprint arXiv:quant-ph/0703190},
year = {2008}
}
备注
4 pages, 2 figures