Effective cutting of a quantum spin chain by bond impurities

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 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.

7 pages; revised version, jour. ref. added

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Cited by in corpus (8)

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• Effects of defects in the XY chain with frustrated boundary conditions
• Local Quench, Majorana Zero Modes, and Disturbance Propagation in the Ising chain
• Quantum coherence, quantum Fisher information and teleportation in the Ising-Heisenberg spin chain model of a heterotrimetallic Fe-Mn-Cu coordination polymer with magnetic impurity
• Localized states and skin effect around non-Hermitian impurities in tight-binding models
• Work statistics, irreversible heat and correlations build-up in joining two spin chains
• High-fidelity non-adiabatic cutting and stitching of a spin chain via local control
• Integrated information storage and transfer with a coherent magnetic device