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Quantum Discord for Investigating Quantum Correlations without Entanglement in Solids

 

              

Professor Jiang-Feng Du (杜江峰)
Hefei National Laboratory for Physical Sciences at Microscale and Department of Modern Physics,University of Science and Technology of China

 

 

 

Abstract: Quantum systems unfold diversified correlations which have no classical counterparts. These quantum correlations have various different facets. Quantum entanglement, as the most well known measure of quantum correlations, plays essential roles in quantum information processing. However, it has recently been pointed out that quantum entanglement cannot describe all the nonclassicality in the correlations. Thus the study of quantum correlations in separable states attracts widely attentions. Herein, we experimentally investigate the quantum correlations of separable thermal states in terms of quantum discord. The sudden change of quantum discord is observed, which captures unambiguously the critical point associated with the behavior of Hamiltonian. Our results display the potential applications of quantum correlations in studying the fundamental properties of quantum system, such as quantum criticality of non-zero temperature.

About the speaker:Dr. Jiang-Feng Du, as a group leader, he has strong background and experience in the field of quantum physics. He has taken his team in the research of magnetic resonance, such as Nuclear Magnetic Resonance (NMR), Electron Spin Resonance (ESR) and Optically Detected Magnetic Resonance (ODMR). The goal of the research is to develop spectroscopic methods and to apply these techniques to the investigation of quantum computation, quantum information and the fundamental issues of quantum mechanics. Due to the excellent research accomplishments, he has received the title of “Yangzi Professor” since 2008.                                      

 Date&Time: May 10, 2012(Thursday)  10:00 – 11:00
Location: 606 Conference Room

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