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arXiv 1102.3724quant-ph
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连续模相干态与单光子的交叉克尔非线性

Cross-Kerr nonlinearity between continuous-mode coherent states and single photons

Bing He, Qing Lin, Christoph Simon

摘要:

单光子与相干态之间的弱交叉克尔非线性是量子信息处理中许多应用的基础。到目前为止,这些非线性主要是在高度理想化的单模模型方面进行了讨论。我们发展了连续模光子脉冲之间相互作用的一般理论,并将其应用于单光子与相干态相互作用的情况。利用保真度和条件相位的概念定量地研究了通常的单模近似的有效性。我们表明,高的结晶度,非零条件相位和高光子数是兼容的,在脉冲完全通过彼此和不必要的横模效应被抑制的条件下。

英文摘要:

Weak cross-Kerr nonlinearities between single photons and coherent states are the basis for many applications in quantum information processing. These nonlinearities have so far mainly been discussed in terms of highly idealized single-mode models. We develop a general theory of the interaction between continuous-mode photonic pulses and apply it to the case of a single photon interacting with a coherent state. We quantitatively study the validity of the usual single-mode approximation using the concepts of fidelity and conditional phase. We show that high fidelities, non-zero conditional phases and high photon numbers are compatible, under conditions where the pulses fully pass through each other and where unwanted transverse-mode effects are suppressed.

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