第四十二期 Fisher information under decoherence in Bloch representation 王晓光 教授 浙江大学物理系 2013年3月15日(周五) 上午10:30-12:00 频标楼4楼报告厅 Abstract: The dynamics of two variants of quantum Fisher information under decoherence is investigated from a geometrical point of view. We first derive the explicit formulas of these two quantities for a single qubit in terms of the Bloch vector. Moreover, we obtain analytical results for them under three different decoherence channels, which are expressed as affine transformation matrices. By calculating the dynamical quantum Fisher information, we find that the collisional dephasing significantly diminishes the precision of the phase parameter with the Ramsey interferometry. We also introduce some results of Fisher information in BoseEinstein condensation. 王晓光教授长期从事量子信息和量子计算理论、量子 光学、固态理论的研究。2001年他的关于海森堡模型 热纠缠的研究被他引300余次,目前SCI收录论文140 余篇,其中《物理评论》系列刊物上共50余篇;论文 共被SCI他引2800余次。2005年获国务院政府特殊津 贴,2006年入选教育部新世纪人才计划,2009年获得 国家杰出青年基金。