科研之友
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摘要
We give a simple proof of the impossibility of probabilistic exact 1 -> 2 cloning for any three different states of a qubit. The simplicity of the proof is due to the use of a stronger version of no violation of the causality principle. The proof is also extended to higher-dimensional Hilbert space, but for a special ensemble of states.
- 出版日期2007-8
