Realization of the optimal phase-covariant quantum cloning machine (4 pages)

Bao‐Long Fang, Ye Liu

Long-Bao Yu, Wen‐Hai Zhang, Ye Liu

Xu‐Bo Zou, Ke Li, Guang‐Can Guo

Bao‐Long Fang, Qing-Min Song, Ye Liu

We present a scheme to realize a special quantum cloning machine in separate cavities. The quantum cloning machine can copy the quantum information from a photon pulse to two distant atoms. Choosing the different parameters, the method can perform optimal symmetric (asymmetric) universal quantum cloning and optimal symmetric (asymmetric) phase-covariant cloning.

Bao‐Long Fang, Gui-Yu Hu, Liu Ye

We present an approach to realize an all-purpose quantum cloning machine and represent how to realize it using SQUID qubit. In this approach, single-qubit rotation operations and two-qubit operations are adjusted to serve the cloning manipulation. Through changing the time parameters, optimal symmetric (asymmetric) 1 → 2 universal quantum cloning, optimal symmetric (asymmetric) 1 → 2 phase-covariant cloning and optimal symmetric 1 → 3 economical phase-covariant cloning can be performed.

Wen‐Hai Zhang, Long-Bao Yu, Ye Liu