CQuIC Seminars
Extracting quantum fisher information from parallel and antiparallel spins
Presented by Nan Li, Chinese Academy of Sciences
Gisin and Popescu have investigated encoding and decoding direction information in parallel and antiparallel spins based on fidelity and conclude that there is more information in the antiparallel ones. In this talk, we will revisit the issue based on quantum Fisher information. We demonstrate that these two criteria yield different strategies for optimally extracting spin information. A surprising observation is that while for a single spin, as well as for parallel spins, quantum Fisher information cannot be fully extracted by any uniform measurement, this is not the case for antiparallel spins. A simple uniform measurement fully extracting quantum Fisher information in antiparallel spins is identified. This reveals a significant feature of antiparallel spins from the perspective of Fisher information and provides an alternative illustration of the idea that antiparallel spins carry more information than parallel ones.
3:30 pm, Thursday, May 22, 2014
PAIS-2540, PAIS
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