Optimal cloning of qubits from replicas of a qubit and its orthogonal states
Journal Article
·
· Physical Review. A
- NTT Communication Science Laboratories, NTT Corporation 3-1, Morinosato Wakamiya, Atsugi-shi, Kanagawa Prefect, 243-0198 (Japan)
We consider the situation where s replicas of a qubit with an unknown state and its orthogonal k replicas are given as an input, and we try to make c clones of the qubit with the unknown state. As a function of s, k, and c, we obtain the optimal fidelity between the qubit with an unknown state and the clone by explicitly giving a completely positive trace-preserving (CPTP) map that represents a cloning machine. We discuss dependency of the fidelity on the values of the parameters s, k, and c.
- OSTI ID:
- 21448652
- Journal Information:
- Physical Review. A, Vol. 82, Issue 3; Other Information: DOI: 10.1103/PhysRevA.82.032314; (c) 2010 The American Physical Society; ISSN 1050-2947
- Country of Publication:
- United States
- Language:
- English
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