Quantum Fisher information for a qubit system placed inside a dissipative cavity

2012 ◽  
Vol 376 (17) ◽  
pp. 1412-1416 ◽  
Author(s):  
K. Berrada ◽  
S. Abdel-Khalek ◽  
A.-S.F. Obada
Keyword(s):  
Fisher Information ◽  
Quantum Fisher Information ◽  
Qubit System

Quantum Fisher Information of a Two-Qubit System in Non-Markovian Environment

2019 ◽  
Vol 59 (1) ◽  
pp. 149-158
Author(s):  
Yao-Hua Hu ◽  
Yong-Gang Tan ◽  
Hai-Feng Yang ◽  
Lei-Ming Cao
Keyword(s):  
Fisher Information ◽  
Quantum Fisher Information ◽  
Markovian Environment ◽  
Qubit System

Fisher information of accelerated two-qubit system in the presence of the color and white noisy channels

2020 ◽  
Vol 34 (05) ◽  
pp. 2050027
Author(s):  
N. Metwally ◽  
F. Ebrahim
Keyword(s):  
Fisher Information ◽  
Quantum Fisher Information ◽  
Entangled State ◽  
Acceleration Process ◽  
Noise Strength ◽  
Initial State ◽  
Noisy Channels ◽  
Noise Effect ◽  
Single Qubit ◽  
Qubit System

In this paper, an accelerated two-qubit system initially prepared in maximum or partial entangled state, which interacts locally with white/color or white-color noises, is considered. Due to the acceleration process and the noise effect, the entanglement degraded. Therefore, the effect of noise strength, initial state settings and the acceleration on the survival entanglement are investigated by means of the concurrence. Moreover, the initial parameters that describe this system are estimated by using the quantum Fisher information, where two forms are considered, namely by using a single and two-qubit forms. It is shown that, by using the two-qubit form, the estimation degree of these parameters is larger than that displayed by using a single-qubit form.

Quantum Fisher Information of Two Moving Four-Level Atoms

2020 ◽  
Vol 41 (3) ◽  
pp. 310-320
Author(s):  
S. Jamal Anwar ◽  
M. Usman ◽  
M. Ramzan ◽  
M. Khalid Khan
Keyword(s):  
Fisher Information ◽  
Quantum Fisher Information

Does relativistic motion always degrade quantum Fisher information?

2021 ◽  
Vol 103 (12) ◽  
Author(s):  
Xiaobao Liu ◽  
Jiliang Jing ◽  
Zehua Tian ◽  
Weiping Yao
Keyword(s):  
Fisher Information ◽  
Quantum Fisher Information ◽  
Relativistic Motion
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