scholarly journals Preservation of Quantum Fisher Information and Geometric Phase of a Single Qubit System in a Dissipative Reservoir Through the Addition of Qubits

2017 ◽  
Vol 57 (4) ◽  
pp. 1013-1023 ◽  
Author(s):  
Y. N. Guo ◽  
Q. L. Tian ◽  
Y. F. Mo ◽  
G. L. Zhang ◽  
K. Zeng
Keyword(s):  
Fisher Information ◽  
Geometric Phase ◽  
Quantum Fisher Information ◽  
Single Qubit ◽  
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.

Coherence and quantum Fisher information in general single-qubit parameter estimation processes

2021 ◽  
Vol 104 (6) ◽  
Author(s):  
Jun-Long Zhao ◽  
Dong-Xu Chen ◽  
Yu Zhang ◽  
Yu-Liang Fang ◽  
Ming Yang ◽  
...  
Keyword(s):  
Parameter Estimation ◽  
Fisher Information ◽  
Quantum Fisher Information ◽  
Single Qubit
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