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Seminar
FIELD Comp.Sciences:Information Science
DATE June 14 (Fri), 2019
TIME 11:00-12:00
PLACE 8101
SPEAKER Su-Yong Lee
HOST Kim, Jaewan
INSTITUTE 국방과학연구소
TITLE Optimal two-mode coherent states in lossy quantum-enhanced metrology
ABSTRACT We investigate an optimal distance of two components in a two-mode coherent state for quantum phase estimation in lossy interferometry. Using the formula of quantum Fisher information over an input mean photon number, we show that the more loss there is in the interferometry, the less entanglement of the two-mode coherent state we need to prepare initially. It represents that the optimal distance of the two-mode components decreases with more loss in the interferometry. We also show that the corresponding optimal measurement is not a simple detection scheme but it is necessary to have correlation measurement bases.
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