无相互作用的量子克隆机(英文)

Interaction-free Quantum Cloning Machine

通过量子Zeno效应的无相互作用测量,提出了1→2经济型相位协变克隆机和1→3无辅助粒子的相位协变克隆机的实现方案.文中构建的量子克隆机与以往的方法相比结构简单,并有很高的成功几率,而且即使在外部有很强的环境干扰的情况下,仍然可以获得与克隆机最优值非常接近的保真度.

The schemes of 1→2 economical phase-covariant quantum cloning machine and 1→3 ancilla-free optimal phase-covariant quantum cloning machine are proposed by using the interaction free measurement（IFM）.We constructed the quantum cloning machine with a simple quantum circuit and a higher probability of success compared to previous methods.We also find that even under the case that the IFM gate is imperfect,we can still get a very high value of fidelity extremely closed to the optimal one,which is very useful for experiment.