Quantum Control of Spin Interactions in Spin-1 Bose Condensates
October 7, 2014 - 7:00am
Effects of dipolar and spin-exchange interactions are entangled in spin-1 Bose-Einstein condensates, due to their coexistence. We propose to independently manipulate the magnetic dipolar and the spin-exchange interactions by applying generalized WAHUHA sequences of rf pulses and by applying periodic dynamical decoupling sequences of optical Feshbach resonance pulses, respectively. While suppressing one interaction, we can make the other interaction dominate the spin dynamics in the condensates. Furthermore, by suppressing both interactions, this method can be harnessed to realize spinor-condensate-based magnetometers with a higher sensitivity.
Reference:  W. Zhang, B. Sun, M. S. Chapman, and L. You, Phys. Rev. A 81, 033602 (2010).  Bo-Yuan Ning, J. Zhuang, J. Q. You, W. Zhang£¬ Phys. Rev. A 84, 013606 (2011).  Bo-Yuan Ning, S. Yi, J. Zhuang, J. Q. You, and W. Zhang, Phys. Rev. A 85, 053646 (2012).
Dr. Wenxian Zhang received his Bachelor and Master of Science degree in Fudan University in 1997 and 2000, respectively. He obtained his Ph. D degree in Georgia Institute of Technology in 2005. After that he did post-doctoral research in Ames Lab and Iowa State University in 2005-2007 and in Department of Physics and Astronomy of Dartmouth College in 2007-2008. He worked in the department of Optical Science and Technology of Fudan University as an associate researcher in 2008-2011. He visited Department of Physics of the Chinese University of Hong Kong in 2009 and RIKEN, Japan in 2010/2011 for several months. He moved to School of Physics and Technology of Wuhan University as a professor in 2012.
Wenxian's research interests include quantum optics, quantum computation and quantum information processing, light and matter interaction, and so on. He has published over 40 peer-reviewed journal papers, including 1 Nat. Phys. and 3 Phys. Rev. Lett., with a total 1000+ citations and H-index of 16. He has been funded by MOST, NSFC, MOE, etc..