Quantum Cloning of Mixed States in Symmetric Subspace

Details Quantum Cloning of Mixed States in Symmetric Subspace Quantum Cloning of Mixed States in Symmetric Subspace

2003-08-11

arxiv.org/abs/quant-ph/0308058v1

Phys.Rev.A 68, 054301 (2003).

Physics

Quantum Physics

Revtex, 4 pages

Scientific paper

10.1103/PhysRevA.68.054301

Quantum cloning machine for arbitrary mixed states in symmetric subspace 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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