Quantum correlations between distant qubits conveyed by large- S spin chains
| Autor: | Paola Verrucchi, R. Vaia, Alessandro Cuccoli, Davide Nuzzi |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Physics
Quantum discord Quantum Physics Condensed Matter - Mesoscale and Nanoscale Physics Cluster state Quantum superposition FOS: Physical sciences Spin engineering Quantum entanglement 01 natural sciences 010305 fluids & plasmas Qubit Quantum mechanics 0103 physical sciences Mesoscale and Nanoscale Physics (cond-mat.mes-hall) W state 010306 general physics Quantum Physics (quant-ph) Quantum teleportation SCHRODINGER-EQUATION STATE APPROACH SYSTEMS LIMIT |
| Zdroj: | Physical Review B 96 (2017): 054449-1–054449-10. doi:10.1103/PhysRevB.96.054449 info:cnr-pdr/source/autori:Nuzzi D.; Cuccoli A.; Vaia R.; Verrucchi P./titolo:Quantum correlations between distant qubits conveyed by large-S spin chains/doi:10.1103%2FPhysRevB.96.054449/rivista:Physical Review B/anno:2017/pagina_da:054449-1/pagina_a:054449-10/intervallo_pagine:054449-1–054449-10/volume:96 |
| DOI: | 10.1103/PhysRevB.96.054449 |
| Popis: | We consider two distant spin-$\frac{1}{2}$ particles (or qubits) and a number of interacting objects, all with the same value $S\gg1$ of their respective spin, distributed on a one-dimensional lattice (or large-$S$ spin chain). The quantum states of the chain are constructed by linearly combining tensor products of single-spin coherent states, whose evolution is determined accordingly, i.e., via classical-like equations of motions. We show that the quantum superposition of the above product states resulting from a local interaction between the first qubit and one spin of the chain evolves so that the second qubit, after having itself interacted with another spin of the chain, can be entangled with the first qubit. Obtaining such outcome does not imply imposing constraints on the length of the chain or the distance between the qubits, which demonstrates the possibility of generating quantum correlations at a distance by means of a macroscopic system, as far as local interactions with just a few of its components are feasible. 11 pages, 9 figures |
| Databáze: | OpenAIRE |
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