Disorder-safe entanglement transfer through ladder qubit chains

Abstract

We study an entanglement transfer protocol in a two-leg ladder spin-1/2 chain in the presence of disorder. In the regime where on-site energies and the intrachain couplings follow aproximately constant proportions locally, we set up a scheme for high-fidelity state transfer via a disorder-protected subspace wherein fluctuations in the parameters do not depend on the global disorder of the system, accounted by $W$. Moreover, we find that the leakage of information from that subspace is actually suppressed upon increasing $W$ and thus the transfer fidelity, evaluated through the entanglement concurrence at the other end of the chain, builds up with the disorder strength.

6 pages, 2 figures; comments welcome

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Cited by in corpus (7)

• Quantum transfer of interacting qubits
• Generation and distribution of atomic entanglement in coupled-cavity arrays
• Quantum state transfer using 1D Heisenberg Hamiltonian on quasi-1D lattices
• Two-excitation routing via linear quantum channels
• Trends of information backflow in disordered spin chains
• Estimating entanglement in 2D Heisenberg model in the strong rung-coupling limit
• Localization properties of a two-channel 3D Anderson model