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arXiv quant-ph/0406128quant-ph
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锁相光束的连续变量纠缠

Continuous variable entanglement of phase locked light beams

H. H. Adamyan, G. Yu. Kryuchkyan

摘要:

详细研究了在模锁相条件下腔内产生连续变量纠缠态的可能性。我们发现,这种量子态可以产生在自锁相的非简并光学参量振荡器(NOPO)的基础上的第二类相位匹配下转换结合线性混频器的两个正交偏振模式的次谐波在一个腔中。一个量子理论的这种设备,最近在实验中实现,开发的亚阈值和阈值以上的操作制度。我们发现,系统提供高水平的相位相干性之间的两个产生的模式,不像普通的NOPO,也表现出不同类型的光子数和这些模式的相位之间的量子相关性。我们将CV纠缠量化为双模压缩,并证明了当泵浦光强度接近自锁NOPO的产生阈值时,在两个偏振态之间的线性耦合常数远小于模失谐量的条件下,积分双模压缩达到最大程度(相对于真空涨落水平为50%).研究了在系统为幺正非耗散动力学的情况下CV纠缠的特殊性。

英文摘要:

We explore in detail the possibility of intracavity generation of continuous-variable (CV) entangled states of light beams under mode phase-locked conditions. We show that such quantum states can be generated in self-phase locked nondegenerate optical parametric oscillator (NOPO) based on a type-II phase-matched down-conversion combined with linear mixer of two orthogonally polarized modes of the subharmonics in a cavity. A quantum theory of this device, recently realized in the experiment, is developed for both sub-threshold and above-threshold operational regimes. We show that the system providing high level phase coherence between two generated modes, unlike to the ordinary NOPO, also exhibits different types of quantum correlations between photon numbers and phases of these modes. We quantify the CV entanglement as two-mode squeezing and show that the maximal degree of the integral two-mode squeezing(that is 50% relative to the level of vacuum fluctuations) is achieved at the pump field intensity close to the generation threshold of self-phase locked NOPO, provided that the constant of linear coupling between the two polarizations is much less than the mode detunings. The peculiarities of CV entanglement for the case of unitary, non-dissipative dynamics of the system under consideration is also cleared up.

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