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arXiv quant-ph/0507099quant-phcond-mat.other
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无序量子比特系统中多体纠缠的产生和保真度衰减

Multipartite entanglement generation and fidelity decay in disordered qubit systems

Simone Montangero, Lorenza Viola

摘要:

我们研究了无序自旋1/2晶格模型中的多体纠缠动力学,该模型表现出从可积性到量子混沌的转变。借用最近推出的广义纠缠框架,我们构造措施的相关性相对于任意本地和双本地自旋可观的,并显示它们如何自然信号之间的交叉不同的动力学制度。特别地,我们发现在短时间内,全局纠缠的产生直接取决于局域态密度,而纠缠的渐近量与混沌多体态的离域程度成正比.我们的结果与无序量子计算硬件中量子信息的稳定性有关。

英文摘要:

We investigate multipartite entanglement dynamics in disordered spin-1/2 lattice models exhibiting a transition from integrability to quantum chaos. Borrowing from the recently introduced generalized entanglement framework, we construct measures for correlations relative to arbitrary local and bi-local spin observables, and show how they naturally signal the crossover between distinct dynamical regimes. In particular, we find that the generation of global entanglement is directly ruled by the local density of states in the short time limit, whereas the asymptotic amount of entanglement is proportional to the degree of delocalization of the chaotic many-body state. Our results are relevant to the stability of quantum information in disordered quantum computing hardware.

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