Dense coding for continuous variables

Dense coding for continuous variables
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DOI:
10.1103/physreva.61.042302
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发表时间:
2000-04-01
期刊:
影响因子:
2.9
通讯作者:
Kimble, HJ
Kimble, HJ
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Braunstein, SL;Kimble, HJ

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提出了一种实现电磁场正交幅度的密集量子编码的方案。该协议利用了非等级参数下转换提供的共同纠缠,以大大增益的极限来达到高效率。对于与信号通道中调制相关的bar的平均光子(n)平均数量的约束,发现密集编码的通道能力在bar(2)上的bar+(n)上的(1+(n)) ,这总是击败连贯的国家通信,并超过bar> 1上的挤压螺距通信皮毛(N)。对于(n)bar >> 1,密集的编码能力接近两倍的方案。
A scheme to achieve dense quantum coding for the quadrature amplitudes of the electromagnetic field is presented. The protocol utilizes shared entanglement provided by nondegenerate parametric down-conversion in the limit of large gain to attain high efficiency. For a constraint in the mean number of photons (n) over bar associated with modulation in the signal channel, the channel capacity for dense coding is found to be In(1+(n) over bar+(n) over bar(2)), which always beats coherent-state communication and surpasses squeezed-stare communication fur (n) over bar>1. For (n) over bar >>1, the dense coding capacity approaches twice that of either scheme.