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arXiv quant-ph/0503207quant-ph
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多维纠缠相干态的退相干

Decoherence of multi-dimensional entangled coherent states

S. J. van Enk

摘要:

对于光的纠缠态,纠缠量和对噪声的敏感度通常都随着态中光子的数量而增加。研究了一组特殊的态--多维纠缠相干态的纠缠灵敏度折衷。这些态具有任意大的纠缠量$E$,只要光子数至少是$2^{2E}$阶。我们计算了由于光子吸收损失,纠缠衰减的速度以及纠缠的剩余量。我们发现,对于非常小的损失的纠缠损失的量是等于$2/\log(2)\approx 2.89$ ebits每个吸收的光子,无论数量的纯态纠缠$E$一开始。相反,对于较大的损失,它往往是剩余的纠缠量是独立的$E$。这可能为创建具有固定纠缠量的状态提供有用的策略。

英文摘要:

For entangled states of light both the amount of entanglement and the sensitivity to noise generally increase with the number of photons in the state. The entanglement-sensitivity tradeoff is investigated for a particular set of states, multi-dimensional entangled coherent states. Those states possess an arbitrarily large amount of entanglement $E$ provided the number of photons is at least of order $2^{2E}$. We calculate how fast that entanglement decays due to photon absorption losses and how much entanglement is left. We find that for very small losses the amount of entanglement lost is equal to $2/\log(2)\approx 2.89$ ebits per absorbed photon, irrespective of the amount of pure-state entanglement $E$ one started with. In contrast, for larger losses it tends to be the remaining amount of entanglement that is independent of $E$. This may provide a useful strategy for creating states with a fixed amount of entanglement.

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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