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Detection of quantum critical points by a probe qubit
Authors:Zhang Jingfu  Peng Xinhua  Rajendran Nageswaran  Suter Dieter
Institution:Technische Universit?t Dortmund, 44221 Dortmund, Germany. zhangjfu2000@yahoo.com
Abstract: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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