常规金属-超导体分支中的能量纠缠
摘要
examined the possibility of detecting energy entanglement in normal metal-superconductor junctions. For the first time we proved that two electrons in a NS structure originating from the same Cooper pair are entangled in the energy subspace. This work follows previous works where spin entanglement was studied in similar circuits. The device consists of a superconducting beam splitter connected to two electronic Mach-Zehnder interferometers. In each arms of the interferometers, energies are filtered with coherent quantum dots. In contrast to previous studies of zero-frequency cross-correlations of electrical currents for this system, attention is drawn to finite-time measurements. This allows to observe two-particle interference for particles with different energies above and below Fermi level. Entanglement is first characterized via the concurrence for the two-particle spatial density matrix. Next, we formulate the Bell inequality, which is written in terms of finite-time noise correlators, and thereby we find a specific set of parameters for which entanglement can be detected.
引用
@article{arxiv.cond-mat/0605428,
title = {Energy entanglement in normal metal-superconducting forks},
author = {K. V. Bayandin and G. B. Lesovik and Thierry Martin},
journal= {arXiv preprint arXiv:cond-mat/0605428},
year = {2009}
}
备注
14 pages, 6 figures