Long-distance entanglement and quantum teleportation inspin chains
- 30 November 2007
- journal article
- Published by American Physical Society (APS) in Physical Review A
- Vol. 76 (5)
- https://doi.org/10.1103/physreva.76.052328
Abstract
Isotropic XX models of one-dimensional spin-1/2 chains are investigated with the aim to elucidate the formal structure and the physical properties that allow these systems to act as channels for long-distance, high-fidelity quantum teleportation. We introduce two types of models: I) open, dimerized XX chains, and II) open XX chains with small end bonds. For both models we obtain the exact expressions for the end-to-end correlations and the scaling of the energy gap with the length of the chain. We determine the end-to-end concurrence and show that model I) supports true long-distance entanglement at zero temperature, while model II) supports {\it ``quasi long-distance''} entanglement that slowly falls off with the size of the chain. Due to the different scalings of the gaps, respectively exponential for model I) and algebraic in model II), we demonstrate that the latter allows for efficient qubit teleportation with high fidelity in sufficiently long chains even at moderately low temperatures.Keywords
This publication has 23 references indexed in Scilit:
- Divergence of the entanglement range in low-dimensional quantum systemsPhysical Review A, 2006
- General Monogamy Inequality for Bipartite Qubit EntanglementPhysical Review Letters, 2006
- Localizable entanglement in antiferromagnetic spin chainsPhysical Review A, 2004
- Entanglement in a simple quantum phase transitionPhysical Review A, 2002
- Scaling of entanglement close to a quantum phase transitionNature, 2002
- Quantum cryptographyReviews of Modern Physics, 2002
- Distributed entanglementPhysical Review A, 2000
- Experimental Realization of Teleporting an Unknown Pure Quantum State via Dual Classical and Einstein-Podolsky-Rosen ChannelsPhysical Review Letters, 1998
- Experimental quantum teleportationNature, 1997
- Quantum limits on bosonic communication ratesReviews of Modern Physics, 1994