Direct observation of quantum criticality in Ising spin chains

Details Direct observation of quantum criticality in Ising spin chains Direct observation of quantum criticality in Ising spin chains

2008-08-11

arxiv.org/abs/0808.1536v2

PHYSICAL REVIEW A 79, 012305 (2009)

Physics

Quantum Physics

Scientific paper

10.1103/PhysRevA.79.012305

We use NMR quantum simulators to study antiferromagnetic Ising spin chains undergoing quantum phase transitions. Taking advantage of the sensitivity of the systems near criticality, we detect the critical points of the transitions using a direct measurement of the Loschmidt echo. We test our simulators for spin chains of even and odd numbers of spins, and compare the experimental results to theoretical predictions.

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