Detection of quantum critical points by a probe qubit

Details Detection of quantum critical points by a probe qubit Detection of quantum critical points by a probe qubit

2007-09-20

arxiv.org/abs/0709.3273v4

Phys. Rev. Lett. 100, 100501 (2008)

Physics

Quantum Physics

A typo removed. Publication version

Scientific paper

10.1103/PhysRevLett.100.100501

Quantum phase transitions occur when the ground state of a quantum system undergoes a qualitative change when an external control parameter reaches a critical value. Here, we demonstrate a technique for studying quantum systems undergoing a phase transition by coupling the system to a probe qubit. It uses directly the increased sensibility of the quantum system to perturbations when it is close to a critical point. Using an NMR quantum simulator, we demonstrate this measurement technique for two different types of quantum phase transitions in an Ising spin chain.

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