Quantum cloning in spin networks

Journal Article · Wed Dec 01 04:00:00 EST 2004 · Physical Review. A

DOI:https://doi.org/10.1103/PhysRevA.70.062308· OSTI ID:20649910

De Chiara, Gabriele; Fazio, Rosario; Montangero, Simone ^[1]; Macchiavello, Chiara ^[2]; Palma, G Massimo ^[3]

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1. NEST-INFM and Scuola Normale Superiore, Piazza dei Cavalieri 7, I-56126 Pisa (Italy)
2. INFM and Dipartimento di Fisica 'A. Volta', Via Bassi 6, I-27100 Pavia (Italy)
3. 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, Journal Name: Physical Review. A Journal Issue: 6 Vol. 70; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
74 ATOMIC AND MOLECULAR PHYSICS
CONTROL
CORRELATIONS
DATA TRANSMISSION
ENERGY LEVELS
HAMILTONIANS
INFORMATION THEORY
NOISE
QUANTUM MECHANICS
QUANTUM NUMBERS
SPIN