NDLI: Dynamics of entanglement and quantum Fisher information for N-level atomic system under intrinsic decoherence

Content Provider	Springer Nature Link
Author	Anwar, S. Jamal Ramzan, M. Khan, M. Khalid
Copyright Year	2017
Abstract	We present a general problem of quantum entanglement quantified by von Neumann entropy for N-level atomic system. Time evolution of state vector of the entire system is investigated numerically under the influence of intrinsic decoherence for moving three-, four- and five-level atoms. It is seen that the phase shift estimator parameter, intrinsic decoherence and the atomic motion play very important role during the time evolution of the atomic systems. There is a monotonic relation between the atomic quantum Fisher information and entanglement in the absence of atomic motion. It is seen that the local maximum values at the revival time of both QFI and $$S_{A}$$ decreases gradually during its time evolution. It decreases more rapidly in case of four- and five-level atoms as compared to the three-level atoms. A periodic behaviour of QFI is seen in the presence of atomic motion which becomes more prominent for higher-dimensional systems. However, atomic quantum Fisher information and entanglement exhibit an opposite behaviour during its time evolution in the presence of atomic motion. The evolution of the entanglement is found to be very prone to the intrinsic decoherence. Dramatic change takes place in the degree of entanglement when the intrinsic decoherence increases. Intrinsic decoherence in the atom-field interaction suppresses the nonclassical effects of the atomic systems. The entanglement and Fisher information saturate to its lower level for longer timescales in the presence of intrinsic decoherence. It leads to the sudden death of entanglement for higher values of intrinsic decoherence. However, the damping behaviour of entanglement remains independent of the system dimensions at larger timescales.
Starting Page	1
Ending Page	18
Page Count	18
File Format	PDF
ISSN	15700755
Journal	Quantum Information Processing
Volume Number	16
Issue Number	6
e-ISSN	15731332
Language	English
Publisher	Springer US
Publisher Date	2017-04-17
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Quantum Fisher information Intrinsic decoherence Atomic motion N-level atomic system Quantum Information Technology, Spintronics Quantum Computing Data Structures, Cryptology and Information Theory Quantum Physics Mathematical Physics
Content Type	Text
Resource Type	Article
Subject	Statistical and Nonlinear Physics Theoretical Computer Science Signal Processing Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering Modeling and Simulation

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