Effective cutting of a quantum spin chain by bond impurities

T. J G Apollaro*, F. Plastina, L. Banchi, A. Cuccoli, R. Vaia, P. Verrucchi, M. Paternostro

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)
183 Downloads (Pure)

Abstract

Spin chains are promising media for short-haul quantum communication. Their usefulness is manifested in all those situations where stationary information carriers are involved. In the majority of the communication schemes relying on quantum spin chains, the latter are assumed to be finite in length, with well-addressable end-chain spins. In this paper we propose that such a configuration could actually be achieved by a mechanism that is able to effectively cut a spin ring through the insertion of bond defects. We then show how suitable physical quantities can be identified as figures of merit for the effectiveness of the cut. We find that, even for modest strengths of the bond defect, a ring is effectively cut at the defect site. In turn, this has important effects on the amount of correlations shared by the spins across the resulting chain, which we study by means of a scattering-based mechanism of a clear physical interpretation. © 2013 American Physical Society.

Original languageEnglish
Article number052336
Number of pages7
JournalPhysical Review A (Atomic, Molecular, and Optical Physics)
Volume88
Issue number5
DOIs
Publication statusPublished - 27 Nov 2013

Keywords

  • XY CHAIN
  • LOCAL MAGNETIZATION
  • ENTANGLEMENT
  • OSCILLATIONS
  • MAGNETS
  • QUBITS
  • STATE

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