Optical implementations of the optimal phase-covariant quantum cloning machine
Optical implementations of the optimal phase-covariant quantum cloning machine
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DOI：
10.1103/physreva.67.052314
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发表时间：
2003-05
影响因子：
2.9
通讯作者：
J. Fiurášek
中科院分区：
文献类型：
--
作者：
J. Fiurášek
我们提出了两个简单的实现最佳对称1{yields}2相位协变克隆机的量子比特。第一种方案是为编码成光子偏振态的量子比特设计的，它涉及两个光子在不平衡分束器上的混合。该方案是概率性的，克隆成功的概率为1/3。在第二种设置中，量子比特由里德伯原子的状态表示，克隆是通过原子与限制在高Q腔中的微波场的共振相互作用来完成的。后一种方法允许确定性地实现最佳克隆转换。
We propose two simple implementations of the optimal symmetric 1{yields}2 phase-covariant cloning machine for qubits. The first scheme is designed for qubits encoded into polarization states of photons and it involves a mixing of two photons on an unbalanced beam splitter. This scheme is probabilistic and the cloning succeeds with the probability 1/3. In the second setup, the qubits are represented by the states of Rydberg atoms and the cloning is accomplished by the resonant interaction of the atoms with a microwave field confined in a high-Q cavity. This latter approach allows for deterministic implementation of the optimal cloning transformation.