Quantum Communication in Spin Systems With Long-Range Interactions

Details Quantum Communication in Spin Systems With Long-Range Interactions Quantum Communication in Spin Systems With Long-Range Interactions

2006-03-16

arxiv.org/abs/quant-ph/0603148v6

PHYSICAL REVIEW A 74, 012321 (2006)

Physics

Quantum Physics

15 pages, 8 eps figures, updated references, corrected text and corrected figs. 1, 4 and 5

Scientific paper

10.1103/PhysRevA.74.012321

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-neighbour 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 4 spins.

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