博士后學術沙龍


 、時 間:201959日(周四)1400

 、地 點:沙河校區通信樓818會議室

 

報告一:

1)主題:Quantum sensing

2)主講人: Utkarsh Mishra  基礎與前沿研究院博士后 

3)交流內容:

Quantum sensing” describes the use of a quantum system, quantum properties, or quantum phenomena to perform a measurement of a physical quantity. Historical examples of quantum sensors include magnetometers based on superconducting quantum interference devices and atomic vapors or atomic clocks. More recently, quantum sensing has become a distinct and rapidly growing branch of research within the area of quantum science and technology, with the most common platforms being spin qubits, trapped ions, and flux qubits. The field is expected to provide new opportunities—especially with regard to high sensitivity and precision—in applied physics and other areas of science. This review provides an introduction to the basic principles, methods, and concepts of quantum sensing from the viewpoint of the interested experimentalist.

Reference:

C. L. Degen, F. Reinhard, and P. Cappellaro Rev. Mod. Phys. 89, 035002 (2017).

 主講人簡介:

Dr Utkarsh Mishra works on non-equilibrium dynamics of many-body systems. He has got his PhD from Harish-Chandra Research Institute in India in 2016. After that he worked as a postdoc at the Asia Pacific Center for Theoretical Physics in Pohang, South Korea. In 2018 he has joined the UESTC as a postdoc to work in the group of Professor Abolfazl Bayat.

 

報告二:

1)主題:Quantum-enhanced measurements without entanglement

2)主講人:Victor Montenegro  基礎與前沿研究院博士后 

3)交流內容:

Quantum-enhanced measurements exploit quantum mechanical effects for increasing the sensitivity of measurements of certain physical parameters and have great potential for both fundamental science and concrete applications. Most of the research has so far focused on using highly entangled states, which are, however, difficult to produce and to stabilize for a large number of constituents. In the following alternative mechanisms are reviewed, notably the use of more general quantum correlations such as quantum discord, identical particles, or nontrivial Hamiltonians; the estimation of thermodynamical parameters or parameters characterizing nonequilibrium states; and the use of quantum phase transitions. Both theoretically achievable enhancements and enhanced sensitivities not primarily based on entanglement that have already been demonstrated experimentally and indicate some possible future research directions are described.

Reference:

D. Braun, G. Adesso, F. Benatti, R. Floreanini, U. Marzolino, M. W. Mitchell, and Stefano Pirandola, Rev. Mod. Phys. 90, 035006 (2018).

(4)主講人簡介:

Dr Victor Montenegro works on the field of quantum opto-mechanics and quantum sensing. He has got his PhD from University College Lonodn in 2015 and after one postdoc at PUC in Chile he has joined the UESTC as a postdoc in 2018. 

 

報告三:

   (1)主題:Understanding Actinium(III) Hydration Structure by Insights from Energies and Wave functions

   (2)主講人:高陽  基礎前沿研究院博士后

   (3)交流內容:

     The physicochemical property of actinium is not very well known since all of its isotopes are highly radioactive, and the element occurs naturally only in trace amounts. (The most stable isotope, 227Ac, has a half-life of about 22 years.) Therefore, it is the goal of the project to use computational physics-chemistry to fill in some of these knowledge gaps. Actinium is quite intriguing chemically in that it behaves essentially as a transition metal but has empty 5f orbitals that are in principle available for bonding as well.

Using the known Ac aquo complex as reference point, we will model complexes with common aqueous ligands (e.g. carbonate, hydroxide) and chelating, multidentate ligands that have been developed for uranium extraction and complexation. The research focuses on thermodynamics and nature of bonding of these complexes using different theoretical methods that incorporate relativistic methods and solvation effects.

    (4)主講人簡介:

     Yang Gao is a post-doc majored in atomic and molecular physics. He obtained bachelor’s degree in physics in Baicheng normal university, then performed PhD research in atomic and molecular physics advised by Prof. Zhigang Wang in Jilin university. His research interests are in the areas of theoretical and computational physics-chemistry, notably electronic structure theory.


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