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arXiv 1702.00660quant-ph
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无光子量子非线性光学

Quantum Nonlinear Optics without Photons

Roberto Stassi, Vincenzo Macrì, Anton Frisk Kockum, Omar Di Stefano, Adam Miranowicz, Salvatore Savasta, Franco Nori

发表信息：
Phys. Rev. A 96, 023818 (2017)
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摘要：

自发参量下转换是量子非线性光学中的公知过程，其中入射到非线性晶体上的光子自发地分裂成两个光子。在这里，我们提出了一个类似的物理过程，其中一个激发原子直接将其激发转移到一对空间分离的原子，概率接近1。这种相互作用是通过虚光子而不是实光子的交换来介导的。这种非线性的原子过程是相干的和可逆的，因此这对被激发的原子可以将激发传递回第一个原子：和频产生光的原子模拟物。用于研究这一过程的参数对应于超强电路量子电动力学的实验证明值。这种方法可以扩展到实现其他非线性原子间过程，如四原子混合，是一个有吸引力的架构，实现量子器件的芯片。我们表明，四量子比特混合可以有效地实现量子重复码，因此，可以用于纠错码。

英文摘要：

Spontaneous parametric down-conversion is a well-known process in quantum nonlinear optics in which a photon incident on a nonlinear crystal spontaneously splits into two photons. Here we propose an analogous physical process where one excited atom directly transfers its excitation to a pair of spatially-separated atoms with probability approaching one. The interaction is mediated by the exchange of virtual rather than real photons. This nonlinear atomic process is coherent and reversible, so the pair of excited atoms can transfer the excitation back to the first one: the atomic analogue of sum-frequency generation of light. The parameters used to investigate this process correspond to experimentally-demonstrated values in ultrastrong circuit quantum electrodynamics. This approach can be extended to realize other nonlinear inter-atomic processes, such as four-atom mixing, and is an attractive architecture for the realization of quantum devices on a chip. We show that four-qubit mixing can efficiently implement quantum repetition codes and, thus, can be used for error-correction codes.

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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