Quantum cloning machines for equatorial qubits

@article{Fan2001QuantumCM,
  title={Quantum cloning machines for equatorial qubits},
  author={Heng Fan and Keiji Matsumoto and Xiang‐Bin Wang and Miki Wadati},
  journal={Physical Review A},
  year={2001},
  volume={65}
}
Quantum cloning machines for equatorial qubits are studied. For the case of a one to two phase-covariant quantum cloning machine, we present the networks consisting of quantum gates to realize the quantum cloning transformations. The copied equatorial qubits are shown to be separable by using Peres-Horodecki criterion. The optimal one to M phase-covariant quantum cloning transformations are given. 
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