Perspectives for a mixed two-qubit system with binomial quantum states

Abstract

The problem of the relationship between entanglement and two-qubit systems in which it is embedded is central to the quantum information theory. This paper suggests that the concurrence hierarchy as an entanglement measure provides an alternative view of how to think about this problem. We consider mixed states of two qubits and obtain an exact solution of the time-dependent master equation that describes the evolution of two two-level qubits (or atoms) within a perfect cavity for the case of multiphoton transition. We consider the situation for which the field may start from a binomial state. Employing this solution, the significant features of the entanglement when a second qubit is weakly coupled to the field and becomes entangled with the first qubit, is investigated. We also describe the response of the atomic system as it varies between the Rabi oscillations and the collapse-revival mode and investigate the atomic inversion and the Q-function. We identify and numerically demonstrate the region of parameters where significantly large entanglement can be obtained. Most interestingly, it is shown that features of the entanglement is influenced significantly when the multi-photon process is involved. Finally, we obtain illustrative examples of some novel aspects of this system and show how the off-resonant case can sensitize entanglement to the role of initial state setting.

18 pages, 9 figures

References in corpus (12)

• Experimental quantum teleportation
• Entangled states and collective nonclassical effects in two-atom systems
• Entanglement induced by a single-mode heat environment
• The entanglement of purification
• A Note on Invariants and Entanglements
• Additivity of the Classical Capacity of Entanglement-Breaking Quantum Channels
• Quantum Entanglement of Identical Particles
• On the fidelity of mixed states of two qubits
• Quantify entanglement by concurrence hierarchy
• Entanglement of 2xK quantum systems
• Entanglement and spin squeezing in the two-atom Dicke model
• Dynamics of two atoms coupled to a cavity field

Cited by in corpus (6)

• Single-atom entropy squeezing for two two-level atoms interacting with a single-mode radiation field
• Single-Shot Generation and Detection of a Two-Photon Generalized Binomial State in a Cavity
• Evolution of the superposition of displaced number states with the two-atom multiphoton Jaynes-Cummings model: interference and entanglement
• Control of a nonlocal entanglement in the micromaser via two quanta non-linear processes induced by dynamic Stark shift
• Correspondence between field generalized binomial states and coherent atomic states
• Transient spectrum of a single-Cooper-pair box with binomial states