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

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Cited by in corpus (17)

• Quantum Communication through Spin Chain Dynamics: an Introductory Overview
• Thermal and Magnetic Quantum Discord in Heisenberg models
• Trapped Rydberg Ions: From Spin Chains to Fast Quantum Gates
• Strong Disorder RG approach - a short review of recent developments
• Correlation amplitude and entanglement entropy in random spin chains
• Entanglement properties of correlated random spin chains and similarities with conformal invariant systems
• Thermal quantum and classical correlations in two qubit XX model in a nonuniform external magnetic field
• Entanglement entropy in aperiodic singlet phases
• Entanglement Entropy in Random Quantum Spin-S Chains
• Noise gates for decoherent quantum circuits
• The correlation functions of certain random antiferromagnetic spin-1/2 critical chains
• Violation of the Bell inequality in quantum critical random spin-$1/2$ chains
• Adaptive Density Matrix Renormalization Group for Disordered Systems
• Concurrence in Disordered Systems
• Entanglement across extended random defects in the XX spin chain
• Witnessing Disorder in Quantum Magnets
• Teleportation based detection of quantum critical points using small spin chains