|Title:||Detection of Quantum Critical Points by a Probe Qubit|
|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.|
|Provenance:||The American Physical Society|
|Citation:||Zhang, Jingfu; Peng, Xinhua; Rajendran, Nageswaran; Suter, Dieter: Detection of Quantum Critical Points by a Probe Qubit. In: Physical Review Letters Jg. 100(2008), 100501.|
|Appears in Collections:||Suter, Dieter Prof. Dr.|
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