Protecting Two-Qubit Quantum States by $\pi$-Phase Pulses
Quantum Physics
2015-05-20 v1
Abstract
We study the state decay of two qubits interacted with a common harmonic oscillator reservoir. There are both decoherence error and the error caused by the amplitude change of the superradiant state. We show that frequent -phase pulses can eliminate both typpes of errors therefore protect a two-qubit odd-parity state more effectively than the frequent measurement method. This shows that the the methods using dynamical decoupling and the quantum Zeno effects actually can give rather {\em different} results when the operation frequency is finite.
Cite
@article{arxiv.1011.3460,
title = {Protecting Two-Qubit Quantum States by $\pi$-Phase Pulses},
author = {Jia-Zhong Hu and Xiang-Bin Wang and LC Kwek},
journal= {arXiv preprint arXiv:1011.3460},
year = {2015}
}