Manipulating Entanglement Dynamics in Dephased Interacting Qubits Using a Radiation Field

Area of Science:

• Quantum Information Science
• Atomic Physics
• Quantum Optics

Background:

• Quantum information processing (QIP) relies on understanding qubit dynamics under environmental influences.
• Non-identical interacting atoms coupled to radiation fields and dephasing are crucial for realistic QIP models.
• Asymmetry and external environmental factors significantly impact quantum system behavior.

Purpose of the Study:

• To investigate the entanglement dynamics of non-identical interacting atoms (qubits) in a cavity radiation field with dephasing.
• To analyze how a radiation field alters entanglement in the presence of dephasing environments.
• To explore the role of initial states, inter-qubit interactions, and environmental coupling on entanglement.

Main Methods:

• Theoretical study of entanglement dynamics for a pair of non-identical interacting qubits.
• Analysis of systems coupled off-resonance to a single-mode cavity radiation field.
• Inclusion of dephasing environments and various initial states disentangled from the field.

Main Results:

• Introducing a radiation field leads to terminal disentanglement in finite time, without revivals.
• Stronger atom-field interaction exacerbates entanglement loss.
• Entanglement dynamics are highly sensitive to initial states, field intensity, detunings, and inter-qubit interactions.
• Correlated dephasing can induce noise-enhanced efficiency, with the radiation field playing a decisive role.

Conclusions:

• External radiation fields can be detrimental to entanglement in QIP systems, causing irreversible loss.
• The interplay between radiation fields, dephasing, and initial states dictates entanglement evolution and potential noise-enhanced efficiency.
• Understanding these dynamics is critical for designing robust quantum information processing platforms.