Controlling Spin Squeezing and Quantum Fisher Information with a Strong External Field

2010 ◽  
Vol 50 (3) ◽  
pp. 767-773 ◽  
Author(s):  
Song-Song Li
Keyword(s):  
External Field ◽  
Fisher Information ◽  
Quantum Fisher Information ◽  
Spin Squeezing ◽  
Strong External Field

Enhanced spin squeezing and quantum entanglement near the critical point of the Jaynes–Cummings–Dicke model

2017 ◽  
Vol 31 (09) ◽  
pp. 1750062 ◽  
Author(s):  
Aranya B. Bhattacherjee ◽  
Deepti Sharma
Keyword(s):  
Critical Point ◽  
Quantum Entanglement ◽  
Fisher Information ◽  
Quantum Information Processing ◽  
Optical Cavity ◽  
Quantum Fisher Information ◽  
Spin Squeezing ◽  
Einstein Condensate ◽  
Bose Einstein Condensate ◽  
Superradiant Phase

We investigate spin squeezing (SS) and the quantum Fisher information (QFI) for the Jaynes–Cummings–Dicke (JCD) model in a two-component atomic Bose–Einstein condensate (BEC) inside an optical cavity. Analytical expressions for spin squeezing and the reciprocal of the quantum Fisher information per particle (RMQFI) are derived using the frozen spin approximation. It is shown that in the superradiant phase near the critical point, maximum squeezing and maximum quantum entanglement occur and thus the critical point emerges as a useful resource for precision measurements. In the presence of decoherence and particle loss, we show that gradually with time, even though the ability of squeezing and entanglement generation are weakened, yet significant amounts are still present which can be relevant to quantum information processing and precision spectroscopy.

scholarly journals Quantum Fisher information and spin squeezing in one-axis twisting model

2014 ◽  
Vol 23 (6) ◽  
pp. 060302 ◽  
Author(s):  
Wei Zhong ◽  
Jing Liu ◽  
Jian Ma ◽  
Xiao-Guang Wang
Keyword(s):  
Fisher Information ◽  
Quantum Fisher Information ◽  
Spin Squeezing

scholarly journals Quantum Fisher information and spin squeezing in the interaction system of light and matter

2014 ◽  
Vol 63 (17) ◽  
pp. 170302
Author(s):  
Chang Feng ◽  
Wang Xiao-Qian ◽  
Gai Yong-Jie ◽  
Yan Dong ◽  
Song Li-Jun
Keyword(s):  
Fisher Information ◽  
Quantum Fisher Information ◽  
Spin Squeezing ◽  
Interaction System
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