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arXiv 0905.1576quant-phphysics.optics
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非线性光学量子门中脉冲形状对光子-光子相互作用的影响

Pulse shape effects on photon-photon interactions in non-linear optical quantum gates

Holger F. Hofmann, Hitoshi Nishitani

摘要:

理想情况下,强非线性可以用来实现量子门的光子量子位通过良好控制的双光子相互作用。然而,非线性相互作用对频率和时间的依赖性使得难以保持相干脉冲形状,该相干脉冲形状可以证明用于光子的时间-频率自由度的单模模型是合理的。在本文中,我们分析了时间多模效应的问题,通过考虑脉冲形状的平均输出场从一个相干输入脉冲。结果表明,一个显着的双光子状态转换的一部分,可以从这个半经典的光学非线性描述。非线性系统对双光子态的影响可以通过输入-输出理论从相干驱动系统的密度矩阵动力学来确定。作为一个例子,描述了单个二能级原子的共振非线性。结果表明,最有效的非线性效应可能不是广泛研究的单模相移,而是将其中一个光子转移到由其时间和光谱特性区分的正交模式。

英文摘要:

Ideally, strong non-linearities could be used to implement quantum gates for photonic qubits by well controlled two photon interactions. However, the dependence of the non-linear interaction on frequency and time makes it difficult to preserve a coherent pulse shape that could justify a single mode model for the time-frequency degree of freedom of the photons. In this paper, we analyze the problem of temporal multi-mode effects by considering the pulse shape of the average output field obtained from a coherent input pulse. It is shown that a significant part of the two photon state transformation can be derived from this semi-classical description of the optical non-linearity. The effect of a non-linear system on a two photon state can then be determined from the density matrix dynamics of the coherently driven system using input-output theory. As an example, the resonant non-linearity of a single two level atom is characterized. The results indicate that the most efficient non-linear effect may not be the widely studied single mode phase shift, but the transfer of one of the photons to an orthogonal mode distinguished by its temporal and spectral properties.

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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