Center for Quantum Information, Institute for Interdisciplinary Information Sciences, Tsinghua University, Beijing 100084, China.
Nat Commun. 2013;4:2915. doi: 10.1038/ncomms3915.
No process in nature can perfectly clone an arbitrary quantum state. But is it possible to engineer processes that replicate quantum information with vanishingly small error? Here we demonstrate the possibility of probabilistic super-replication phenomena where N equally prepared quantum clocks are transformed into a much larger number of M nearly perfect replicas, with an error that rapidly vanishes whenever M is small compared with N(2). The quadratic replication rate is the ultimate limit imposed by quantum mechanics to the proliferation of information and is fundamentally linked with the Heisenberg limit of quantum metrology.
自然界中没有任何过程可以完美地克隆任意量子态。但是，是否有可能设计出能够以极小误差复制量子信息的过程呢？在这里，我们展示了概率超级复制现象的可能性，其中 N 个同样准备好的量子钟被转换为数量大得多的 M 个几乎完美的副本，只要 M 相对于 N(2) 较小，误差就会迅速消失。二次复制率是量子力学对信息增殖施加的极限，与量子计量学的海森堡极限有着根本的联系。
