Fast and efficient long-distance quantum state transfer in long-range spin- 1 2 models
Year: 2025
Type: article
Abstract: Quantum state transfer (QST) is investigated beyond the nearest-neighbour coupling scheme in long spin- 1 2 linear chains. Exploiting the properties of the next-nearest neighbour Hamiltonian’s dispersion relation, it is shown that with minimal engineering, i.e. an on-site magnetic field on the two end sites and only a few symmetrically-modified end inter-site couplings, an average transfer fidelity above 99% can be achieved. To leading order, the required time scales linearly with the length of the chain. Such a fast, high-quality QST is based on the ballistic propagation of the wave packet centred in the linear region of the dispersion relation by means of the on-site magnetic field. At the same time, the wave packet width, modulated by the inter-site couplings at the chain ends, whose values are found via a carefully designed genetic algorithm, is constrained mostly in the linear region of the dispersion relation. Our coupling scheme is shown to hold for arbitrary values of the next-nearest inter-site coupling and can be straightforwardly applied to longer-range coupling schemes.
Source: New Journal of Physics
Authors: F Faria, C C Nelmes, T J G Apollaro, T P Spiller, I D’Amico
Institutions: University of York, University of Malta
Language: English
Subfield: Artificial Intelligence
Field: Computer Science
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $2,610
OpenAlex ID: W4416712544