dorsal/arxiv
View SchemaQuantum State Transfer in Spin-1 Chains
| Authors | O. Romero-Isart, K. Eckert, A. Sanpera |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0610210 |
| URL | https://arxiv.org/abs/quant-ph/0610210 |
| DOI | 10.1103/PhysRevA.75.050303 |
| Journal | Phys. Rev. A 75, 050303(R) (2007) |
Abstract
We study the transfer of quantum information through a Heisenberg spin-1 chain prepared in its ground state. We measure the efficiency of such a quantum channel {\em via} the fidelity of retrieving an arbitrarily prepared state and {\em via} the transfer of quantum entanglement. The Heisenberg spin-1 chain has a very rich quantum phase diagram. We show that the phase boundaries are reflected in sharp variations of the transfer efficiency. In the vicinity of the border between the dimer and the ferromagnetic phase (in the conjectured spin-nematic region), we find strong indications for a qualitative change of the excitation spectrum. Moreover, we identify two regions of the phase diagram which give rise to particularly high transfer efficiency; the channel might be non-classical even for chains of arbitrary length, in contrast to spin-1/2 chains.
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"abstract": "We study the transfer of quantum information through a Heisenberg spin-1\nchain prepared in its ground state. We measure the efficiency of such a quantum\nchannel {\\em via} the fidelity of retrieving an arbitrarily prepared state and\n{\\em via} the transfer of quantum entanglement. The Heisenberg spin-1 chain has\na very rich quantum phase diagram. We show that the phase boundaries are\nreflected in sharp variations of the transfer efficiency. In the vicinity of\nthe border between the dimer and the ferromagnetic phase (in the conjectured\nspin-nematic region), we find strong indications for a qualitative change of\nthe excitation spectrum. Moreover, we identify two regions of the phase diagram\nwhich give rise to particularly high transfer efficiency; the channel might be\nnon-classical even for chains of arbitrary length, in contrast to spin-1/2\nchains.",
"arxiv_id": "quant-ph/0610210",
"authors": [
"O. Romero-Isart",
"K. Eckert",
"A. Sanpera"
],
"categories": [
"quant-ph",
"cond-mat.other"
],
"doi": "10.1103/PhysRevA.75.050303",
"journal_ref": "Phys. Rev. A 75, 050303(R) (2007)",
"title": "Quantum State Transfer in Spin-1 Chains",
"url": "https://arxiv.org/abs/quant-ph/0610210"
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