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arXiv 1705.00436cond-mat.mes-hallphysics.app-phquant-ph
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光力学量子限制定向放大器

Quantum-limited directional amplifiers with optomechanics

Daniel Malz, László D. Tóth, Nathan R. Bernier, Alexey K. Feofanov, Tobias J. Kippenberg, Andreas Nunnenkamp

摘要:

定向放大器是量子信息处理中的重要资源,因为它们保护敏感的量子系统免受过量噪声的影响。在这里,我们提出了一种实现的相位保持和相位敏感的定向放大器的微波信号的机电设置包括两个微波腔和两个机械谐振器。我们表明,两者都可以达到各自的量子极限增加的噪音。在相反的方向上,它们会发出来自机械谐振器的热噪声,我们将讨论如何抑制这种噪声,这是技术应用的一个关键方面。两者的隔离带宽都是机械线宽除以幅度增益的数量级。我们推导出这两种放大器的带宽和增益带宽积,发现相敏放大器具有无限的增益带宽积。我们的研究是迈向灵活的,片上集成微波信号非互易放大器的重要一步。

英文摘要:

Directional amplifiers are an important resource in quantum information processing, as they protect sensitive quantum systems from excess noise. Here, we propose an implementation of phase-preserving and phase-sensitive directional amplifiers for microwave signals in an electromechanical setup comprising two microwave cavities and two mechanical resonators. We show that both can reach their respective quantum limits on added noise. In the reverse direction, they emit thermal noise stemming from the mechanical resonators and we discuss how this noise can be suppressed, a crucial aspect for technological applications. The isolation bandwidth in both is of the order of the mechanical linewidth divided by the amplitude gain. We derive the bandwidth and gain-bandwidth product for both and find that the phase-sensitive amplifier has an unlimited gain-bandwidth product. Our study represents an important step toward flexible, on-chip integrated nonreciprocal amplifiers of microwave signals.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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