Authors: Suter, Dieter
Zhang, Jingfu
Peng, Xinhua
Rajendran, Nageswaran
Title: Detection of Quantum Critical Points by a Probe Qubit
Language (ISO): en
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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Issue Date: 2008-03-13
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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