Surpassing the no-cloning limit with a heralded hybrid linear amplifier for coherent states.
Surpassing the no-cloning limit with a heralded hybrid linear amplifier for coherent states.
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DOI：
10.1038/ncomms13222
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发表时间：
2016-10-26
影响因子：
16.6
通讯作者：
Lam, Ping Koy
中科院分区：
文献类型：
--
作者：
Haw, Jing Yan;Zhao, Jie;Dias, Josephine;Assad, Syed M.;Bradshaw, Mark;Blandino, Remi;Symul, Thomas;Ralph, Timothy C.;Lam, Ping Koy
不可克隆定理指出，由于量子力学的线性，无法准确且确定地克隆未知的量子态。与该定理相关的是定量的非克隆极限，它为生成的克隆的质量设定了上限。然而，可以通过放弃决定论并使用概率方法来规避这一限制。在这里，我们报告了任意相干态的概率克隆的实验演示，该状态明显超过了不可克隆的极限。我们的方案基于混合线性放大器，它将理想的确定性线性放大器与基于测量的无噪声放大器相结合。我们演示了最多五个克隆的产生，每个克隆的保真度明显超过相应的非克隆限制。此外，由于克隆事件的成功预示，我们的方案有可能在量子中继器、隐形传态和计算应用中得到采用。 克隆未知的量子态具有挑战性，并且克隆质量的限制是由不可克隆定理设定的。在这里，作者证明了使用基于混合概率确定性线性放大器的有效量子克隆器超越了这一限制。
The no-cloning theorem states that an unknown quantum state cannot be cloned exactly and deterministically due to the linearity of quantum mechanics. Associated with this theorem is the quantitative no-cloning limit that sets an upper bound to the quality of the generated clones. However, this limit can be circumvented by abandoning determinism and using probabilistic methods. Here, we report an experimental demonstration of probabilistic cloning of arbitrary coherent states that clearly surpasses the no-cloning limit. Our scheme is based on a hybrid linear amplifier that combines an ideal deterministic linear amplifier with a heralded measurement-based noiseless amplifier. We demonstrate the production of up to five clones with the fidelity of each clone clearly exceeding the corresponding no-cloning limit. Moreover, since successful cloning events are heralded, our scheme has the potential to be adopted in quantum repeater, teleportation and computing applications. Cloning an unknown quantum state is challenging and the limit on the quality of clones is set by the no-cloning theorem. Here, the authors demonstrated the surpassing of such a limit using an effective quantum cloner based on a hybrid probabilistic-deterministic linear amplifier.
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