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arXiv 1802.01665cond-mat.mes-hallquant-ph
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超强耦合波导QED中粒子的产生

Particle Production in Ultra-Strong Coupling Waveguide QED

Nicolas Gheeraert, Xin H. H. Zhang, Théo Sépulcre, Soumya Bera, Nicolas Roch, Harold U. Baranger, Serge Florens

摘要:

理解大尺度相互作用的量子物质需要处理大量的量子,这些量子是通过将几个粒子散射到一个复杂的量子物体上而产生的。突出的例子是从高能宇宙射线簇射到简并费米气体的光或电驱动。我们在多体量子光学的背景下解决这一挑战,由于最近的发展,电路量子电动力学在超强耦合的动机。粒子生产的问题是解决定量与一个简单而强大的概念植根于量子叠加原理。通过对耦合到高阻抗波导中的单个二能级原子的多光子辐射的研究,说明了这一关键思想。我们惊讶地发现,非共振非弹性发射线型占主导地位的宽带粒子生产,由于大的相空间与贡献,不保存激发的数量。这种频率转换过程在时间相关测量中产生了惊人的信号,可以在量子波导中进行实验测试。这些想法为各种物理系统的模拟开辟了新的方向,从固体中的极化子动力学到复杂的超导量子架构。

英文摘要:

Understanding large-scale interacting quantum matter requires dealing with the huge number of quanta that are produced by scattering even a few particles against a complex quantum object. Prominent examples are found from high energy cosmic ray showers to the optical or electrical driving of degenerate Fermi gases. We tackle this challenge in the context of many-body quantum optics, as motivated by the recent developments of circuit quantum electrodynamics at ultrastrong coupling. The issue of particle production is addressed quantitatively with a simple yet powerful concept rooted in the quantum superposition principle. This key idea is illustrated by the study of multi-photon emission from a single two-level artificial atom coupled to a high impedance waveguide. We find surprisingly that the off-resonant inelastic emission lineshape is dominated by broadband particle production, due to the large phase space associated with contributions that do not conserve the number of excitations. Such frequency conversion processes produce striking signatures in time correlation measurements, which can be tested experimentally in quantum waveguides. These ideas open new directions for the simulation of a variety of physical systems, from polaron dynamics in solids to complex superconducting quantum architectures.

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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