Quantum metrology with BECs: towards a topologically based mass standard

Tim Byrnes Assistant Professor

New York University (Shanghai campus)

地点: 2教420教室 时间: 10 月14日 (星期三) 15:10-18:00

Bose-Einstein condensates (BECs) are the coldest substances in the universe and devices based on BECs are an opportunity to develop quantum technologies for precision measurement. When vortices are displaced in BECs, the Magnus force gives the system a momentum transverse in the direction to the displacement. We show that BECs in long channels with vortices exhibit a quantization of the current response with respect to the spatial vortex distribution. In a similar way to the integer quantum Hall effect, the current along the channel is related to this topological phase, and can be extracted from two experimentally measurable quantities: the total momentum of the BEC and the spatial distribution. The spatial distribution may be performed by phase contrast imaging (PCI), which provides a non-destructive probe of the spatial distribution. We present a theory of PCI which works at the single shot level. Our results presents the possibility that the configuration described here can be used as a novel way of measuring the mass of the atoms in the BEC using a topological inTim Byrnes completed his PhD at the University of New South Wales in Sydney, Australia in the fields of condensed matter physics and high energy physics under the supervision of Prof. Chris Hamer. He then moved to Tokyo, Japan to commence a postdoctoral fellowship with Prof. Yoshihisa Yamamoto in the field of quantum information at the National Institute of Informatics and the University of Tokyo.?There he worked on topics related to quantum simulation, such as methods of solving lattice gauge theories on a quantum computer, and semiconductor implementations of a quantum simulator.?He has worked on the theory of BEC in exciton-polariton systems, such as the BEC-BCS crossover and applications to the generation of non-classical light. He is now Assistant Professor at New York University (Shanghai campus), where he examines BECs for various applications in quantum information technology.

variant of the system.

联系人：何琼毅 研究员(qiongyihe@pku.edu.cn)