Qubit Teleportation and Transfer across Antiferromagnetic Spin Chains

Details Qubit Teleportation and Transfer across Antiferromagnetic Spin Chains Qubit Teleportation and Transfer across Antiferromagnetic Spin Chains

2007-03-22

arxiv.org/abs/quant-ph/0703202v2

Phys. Rev. Lett. 99, 060401 (2007)

Physics

Quantum Physics

5 pages, 4 .eps figures

Scientific paper

10.1103/PhysRevLett.99.060401

We explore the capability of spin-1/2 chains to act as quantum channels for both teleportation and transfer of qubits. Exploiting the emergence of long-distance entanglement in low-dimensional systems [Phys. Rev. Lett. 96, 247206 (2006)], here we show how to obtain high communication fidelities between distant parties. An investigation of protocols of teleportation and state transfer is presented, in the realistic situation where temperature is included. Basing our setup on antiferromagnetic rotationally invariant systems, both protocols are represented by pure depolarizing channels. We propose a scheme where channel fidelity close to one can be achieved on very long chains at moderately small temperature.

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