Quantum State Transfer in Spin-1 Chains

Abstract

We study the transfer of quantum information through a Heisenberg spin-1 chain prepared in its ground state. We measure the efficiency of such a quantum channel {\em via} the fidelity of retrieving an arbitrarily prepared state and {\em via} the transfer of quantum entanglement. The Heisenberg spin-1 chain has a very rich quantum phase diagram. We show that the phase boundaries are reflected in sharp variations of the transfer efficiency. In the vicinity of the border between the dimer and the ferromagnetic phase (in the conjectured spin-nematic region), we find strong indications for a qualitative change of the excitation spectrum. Moreover, we identify two regions of the phase diagram which give rise to particularly high transfer efficiency; the channel might be non-classical even for chains of arbitrary length, in contrast to spin-1/2 chains.

4 pages, 4 figures, published version

References in corpus (3)

• Time evolution algorithms for Matrix Product States and DMRG
• Quantum state transmission via a spin ladder as a robust data bus
• Phase diagram of spin-1 bosons on one-dimensional lattices

Cited by in corpus (6)

• Quantum Non-Demolition Detection of Strongly Correlated Systems
• Efficient quantum state transfer in spin chains via adiabatic passage
• Simulation of high-spin Heisenberg models in coupled cavities
• Quantum Ratchets for Quantum Communication with Optical Superlattices
• Control-limited perfect state transfer, quantum stochastic resonance and many-body entangling gate in imperfect qubit registers
• Iterative quantum state transfer along a chain of nuclear spin qubits