Stabilizing a Bell state of two superconducting qubits by dissipation engineering
Abstract
We propose a dissipation engineering scheme that prepares and protects a maximally entangled state of a pair of superconducting qubits. This is done by off-resonantly coupling the two qubits to a low-Q cavity mode playing the role of a dissipative reservoir. We engineer this coupling by applying six continuous-wave microwave drives with appropriate frequencies. The two qubits need not be identical. We show that our approach does not require any fine-tuning of the parameters and requires only that certain ratios between them be large. With currently achievable coherence times, simulations indicate that a Bell state can be maintained over arbitrary long times with fidelities above 94%. Such performance leads to a significant violation of Bell's inequality (CHSH correlation larger than 2.6) for arbitrary long times.
Cite
@article{arxiv.1303.3819,
title = {Stabilizing a Bell state of two superconducting qubits by dissipation engineering},
author = {Z. Leghtas and U. Vool and S. Shankar and M. Hatridge and S. M. Girvin and M. H. Devoret and M. Mirrahimi},
journal= {arXiv preprint arXiv:1303.3819},
year = {2013}
}
Comments
5 pages, 4 figures