Characterizing quantum correlations in spin chains
- URL: http://arxiv.org/abs/2005.09604v1
- Date: Tue, 19 May 2020 17:25:37 GMT
- Title: Characterizing quantum correlations in spin chains
- Authors: Artur Niezgoda, Mi{\l}osz Panfil and Jan Chwede\'nczuk
- Abstract summary: We show that a single element of the density matrix carries the answer to how quantum is a chain of spins.
This method can be used to tailor and witness highly non-classical effects in many-body systems.
As a proof of principle, we investigate the extend of non-locality and entanglement in ground states and thermal states of experimentally accessible spin chains.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: The growth in the demand for precisely crafted many-body systems of
spin-$1/2$ particles/qubits is due to their top-notch versatility in
application-oriented quantum-enhanced protocols and the fundamental tests of
quantum theory. Here we address the question: how quantum is a chain of spins?
We demonstrate that a single element of the density matrix carries the answer.
Properly analyzed it brings information about the extent of the many-body
entanglement and the non-locality. This method can be used to tailor and
witness highly non-classical effects in many-body systems with possible
applications to quantum computing, ultra-precise metrology or large-scale tests
of quantum mechanics. As a proof of principle, we investigate the extend of
non-locality and entanglement in ground states and thermal states of
experimentally accessible spin chains.
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