Quantum communication in spin systems with long-range interactions

Journal Article · Sat Jul 15 00:00:00 EDT 2006 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.74.012321· OSTI ID:20852891

Avellino, M; Fisher, A J; Bose, S ^[1]

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1. Department of Physics and Astronomy and London Centre for Nanotechnology, University College London, Gower Street, London WC1E 6BT (United Kingdom)

We calculate the fidelity of transmission of a single qubit between distant sites on semi-infinite and finite chains of spins coupled via the magnetic dipole interaction. We show that such systems often perform better than their Heisenberg nearest-neighbor coupled counterparts, and that fidelities closely approaching unity can be attained between the ends of finite chains without any special engineering of the system, although state transfer becomes slow in long chains. We discuss possible optimization methods, and find that, for any length, the best compromise between the quality and the speed of the communication is obtained in a nearly uniform chain of four spins.

• OSTI ID: 20852891
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 1 Vol. 74; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
DATA TRANSMISSION
ENERGY LEVELS
INTERACTION RANGE
MAGNETIC DIPOLES
OPTIMIZATION
QUANTUM COMPUTERS
QUANTUM MECHANICS
QUBITS
SPIN
VELOCITY