Quantum cloning in spin networks
Journal Article
·
· Physical Review. A
- NEST-INFM and Scuola Normale Superiore, Piazza dei Cavalieri 7, I-56126 Pisa (Italy)
- INFM and Dipartimento di Fisica 'A. Volta', Via Bassi 6, I-27100 Pavia (Italy)
- NEST-INFM and Dipartimento di Tecnologie dell'Informazione, Universita degli studi di Milano, via Bramante 65, I-26013 Crema, CR (Italy)
We introduce an approach to quantum cloning based on spin networks and we demonstrate that phase covariant cloning can be realized using no external control but only with a proper design of the Hamiltonian of the system. In the 1{yields}2 cloning we find that the XY model saturates the value for the fidelity of the optimal cloner and gives values comparable to it in the general N{yields}M case. We finally discuss the effect of external noise. Our protocol is much more robust to decoherence than a conventional procedure based on quantum gates.
- OSTI ID:
- 20649910
- Journal Information:
- Physical Review. A, Vol. 70, Issue 6; Other Information: DOI: 10.1103/PhysRevA.70.062308; (c) 2004 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1050-2947
- Country of Publication:
- United States
- Language:
- English
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