现实系统中的自旋放大

Ivan Iakoupov, Victor M. Bastidas, Yuichiro Matsuzaki, Shiro Saito, William J. Munro
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引用次数: 0

摘要

自旋放大是在一开始只有一个激发自旋的情况下增加激发自旋数量的理想过程。我们利用最优控制技术来寻找经典的驱动脉冲形状,结果表明自旋放大可以在以前未曾探索过的体系中进行,放大时间与哈密顿中的相互作用项所设定的时间尺度相当。这比之前的协议快了一个数量级,即使自旋系统存在显著的不连贯和不均匀性,也能实现自旋放大。初始的自旋激发可以在整个集合中分散,这是更典型的光子被自旋集体吸收的情况。我们重点研究了作为自旋的超导持久电流人造原子,但这种方法也可应用于其他类型的强相互作用自旋,包括里德伯原子。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Spin amplification in realistic systems
Spin amplification is the process that ideally increases the number of excited spins if there was one excited spin to begin with. Using optimal control techniques to find classical drive pulse shapes, we show that spin amplification can be done in the previously unexplored regime with amplification times comparable to the timescale set by the interaction terms in the Hamiltonian. This is an order of magnitude faster than the previous protocols and makes spin amplification possible even with significant decoherence and inhomogeneity in the spin system. The initial spin excitation can be delocalized over the entire ensemble, which is a more typical situation when a photon is collectively absorbed by the spins. We focus on the superconducting persistent-current artificial atoms as spins, but this approach can be applied to other kinds of strongly-interacting spins, including the Rydberg atoms.
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