Quantum channels in random spin chains

Abstract

We study the entanglement between pairs of qubits in a random antiferromagnetic spin-1/2 chain at zero temperature. We show that some very distant pairs of qubits are highly entangled, being almost pure Bell states. Furthermore, the probability to obtain such spin pairs is proportional to the chain disorder strenght and inversely proportional to the square of their separation.

v1: 4 pages, 2 eps figures; v2: discussion about the effect of temperature added, v3: 1 eps figure added, enlarged discussions, 6 pages, published version

References in corpus (2)

• Scaling of Entanglement Entropy in the Random Singlet Phase
• Phase diagrams and universality classes of random antiferromagnetic spin ladders

Cited by in corpus (5)

• Quantum Communication through Spin Chain Dynamics: an Introductory Overview
• Trapped Rydberg Ions: From Spin Chains to Fast Quantum Gates
• Correlation amplitude and entanglement entropy in random spin chains
• Entanglement Entropy in Random Quantum Spin-S Chains
• Noise gates for decoherent quantum circuits