Quantum cloning of mixed states in symmetric subspaces

@article{Fan2003QuantumCO,
  title={Quantum cloning of mixed states in symmetric subspaces},
  author={Heng Fan},
  journal={Physical Review A},
  year={2003},
  volume={68},
  pages={054301}
}
  • H. Fan
  • Published 11 August 2003
  • Computer Science
  • Physical Review A
Quantum-cloning machine for arbitrary mixed states in symmetric subspaces is proposed. This quantum-cloning machine can be used to copy part of the output state of another quantum-cloning machine and is useful in quantum computation and quantum information. The shrinking factor of this quantum cloning achieves the well-known upper bound. When the input is identical pure states, two different fidelities of this cloning machine are optimal. 
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