2007/09/30 by Jingfu Zhang, Xinhua Peng, Nageswaran Rajendran +1 · 2 citations
Computer Science · Physics and Astronomy · #Quantum Information and Cryptography #Quantum and electron transport phenomena #Quantum many-body systems #quant-ph
paper · pdf · doi:10.1103/physrevlett.100.100501
published as Phys. Rev. Lett. 100, 100501 (2008) · A typo removed. Publication version
openalex publication_date 2008/03/13 · arxiv created 2008/03/14 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
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.