International Journal of Physics | Vol. 7, No. 11, November 2016 | pp. 81–88
DOI: 10.46882/2016/IJP/000079
Research Article
Title: Quantum Entanglement Dynamics and Decoherence Controls in Driven Lambda-Type Atomic Systems
Names of Authors: S. H. Zhang¹, M. S. Al-Rashid²
Authors’ Affiliations: ¹Department of Physics, Tsinghua University, Beijing, China; ²Department of Physics, King Abdulaziz University, Jeddah, Saudi Arabia
Abstract: Preserving quantum correlations against environmental noise is a major bottleneck in developing scalable quantum information processing architectures. This paper investigates the time-dependent evolution of quantum entanglement and evaluates active decoherence control strategies within driven lambda-type three-level atomic systems. The system models a lambda-type atom coupled to a lossy optical microcavity interacting with a localized thermal phonon bath. We utilized the density matrix master equation framework within the Lindblad dissipation model at an operating temperature of 4.2 K. Our numerical calculations show that configuring the driving laser fields under electromagnetically induced transparency conditions effectively decouples the atomic state from the cavity decay channel. This decoupling preserves bipartite entanglement for durations exceeding 18.0 ns, maintaining a concurrence value above 0.84. We simulated an active dynamical decoupling pulse sequence that suppresses phase relaxation caused by low-frequency phonon noise. The optimized sequence yielded a quantum gate operation fidelity of 99.3% ± 0.2%. These findings provide an effective theoretical framework for designing noise-resistant quantum memory registers and stabilizing non-classical states within complex quantum networks.
Keywords: Quantum entanglement; decoherence; three-level atom; Lindblad master equation; dynamical decoupling; electromagnetically induced transparency
Manuscript Timeline: Received: July 03, 2016; Revised: August 20, 2016; Accepted: September 12, 2016; Published: November 14, 2016
Citation: Zhang, S. H., & Al-Rashid, M. S. (2016). Quantum Entanglement Dynamics and Decoherence Controls in Driven Lambda-Type Atomic Systems. International Journal of Physics, 7(11), 81–88.
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