Thermal effects on quantum communication through spin chains

Abstract

We study the effect of thermal fluctuations in a recently proposed protocol for transmission of unknown quantum states through quantum spin chains. We develop a low temperature expansion for general spin chains. We then apply this formalism to study exactly thermal effects on short spin chains of four spins. We show that optimal times for extraction of output states are almost independent of the temperature which lowers only the fidelity of the channel. Moreover we show that thermal effects are smaller in the anti-ferromagnetic chains than the ferromagnetic ones.

14 pages, Latex, five eps figures, references added

References in corpus (6)

• Entanglement of Formation of an Arbitrary State of Two Qubits
• Quantum Communication Through an Unmodulated Spin Chain
• Entangled Rings
• Quantum entanglement and Bell inequalities in Heisenberg spin chains
• Quantum Computing with an 'Always On' Heisenberg Interaction
• Quantum computation with un-tunable couplings

Cited by in corpus (20)

• Quantum Communication through Spin Chain Dynamics: an Introductory Overview
• Optimal quantum chain communication by end gates
• Information Transferring Ability of the Different Phases of a finite XXZ Spin Chain
• Universal destabilization and slowing of spin transfer functions by a bath of spins
• Transfer of d-Level quantum states through spin chains by random swapping
• Spin State Transfer in Laterally Coupled Quantum Dot Chains with Disorders
• Measurement induced dynamics for spin chain quantum communication and its application for optical lattices
• Disorder overtakes Order in Information Concentration over Quantum Networks
• Beating no-go theorems by engineering defects in quantum spin models
• Thermal Fluctuations Enhance Order-from-Disorder of Quantum Correlations in Quenched Disordered Spin Models
• Entanglement Transfer via XXZ Heisenberg chain with DM Interaction
• Concurrence in Disordered Systems
• Response to defects in multi- and bipartite entanglement of isotropic quantum spin networks
• Long-distance Entanglement generation by Local Rotational Protocols in spin chains
• Temperature-dependent remote control of polarization and coherence intensity with pure sender's initial state
• Measurement enhances long-distance Entanglement generation in spin chains with dissipative processes
• Entanglement Amplification in the Non-Perturbative Dynamics of Modular Quantum Systems
• Remote control of quantum correlations in two-qubit receiver via three-qubit sender
• Dynamics of entanglement of bosonic modes on symmetric graphs
• Thermal decoherence of long-distance entanglement in spin-1 chains