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Nonexistence of entanglement sudden death in dephasing of high NOON states

机译:在高NOON状态移相时纠缠突然死亡的不存在

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摘要

We study the dynamics of entanglement in continuous variable quantum systems. Specifically, we study thenphenomena of entanglement sudden death (ESD) in general two-mode-N-photon states undergoing purendephasing. We show that for these circumstances, ESD never occurs. These states are generalizations of thenso-called high NOON states (i.e., a superposition of N photons in the first mode, O in the second, with Onphotons in the first, N in the second), shown to decrease the Rayleigh limit of u0001 to u0001/N, which promises greatnimprovement in resolution of interference patterns if states with large N are physically realized [Phys. Rev.nLett. 85, 2733 (2000)]. However, we show that in dephasing NOON states, the time to reach some criticalnvisibility Vcrit, scales inversely with N2. On the practical level, this shows that as N increases, the visibilityndegrades much faster, which is likely to be a considerable drawback for any practical application of thesenstates. © 2009 Optical Society of America
机译:我们研究了连续可变量子系统中的纠缠动力学。具体来说,我们研究了在进行正视眼的一般双模N光子状态下的纠缠猝死(ESD)现象。我们证明在这种情况下,ESD永远不会发生。这些状态是所谓的高NOON状态的概括(即,第一个模式中N个光子的叠加,第二个模式中O的叠加,第一个模式中的Onphotons叠加,第二个模式中的N叠加),表明将u0001的瑞利极限减小到u0001 / N,如果物理上实现具有大N的状态,则有望大大提高干涉图样的分辨率。雷特牧师85,2733(2000)]。但是,我们表明,在使NOON相移相时,达到某些临界可见性Vcrit的时间与N2成反比。从实践的角度来看,这表明随着N的增加,可见度的下降速度要快得多,这对于任何实际使用牙膏都有很大的缺点。 ©2009美国眼镜学会

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  • 来源
    《Optics Letters》 |2009年第3期|p.268-270|共3页
  • 作者单位

    Department of Physics, University of Toronto, Toronto, Ontario M5S 1A7, Canada* Corresponding author: alqasimi@physics.utoronto.ca* Corresponding author: phytong@zju.edu.cn;

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