2012/05/31 by Himadri Shekhar Dhar, Subhashish Banerjee, Arpita Chatterjee +2 · 17 citations
Computer Science · Physics and Astronomy · #Atom (system on chip) #Density matrix #Monotonic function #Photon #Physics #Population #Quantum #Quantum Information and Cryptography #Quantum Mechanics and Applications #Quantum correlation #Quantum discord #Quantum entanglement #Quantum mechanics #Quantum optics and atomic interactions #Statistical physics #physics.optics #quant-ph
paper · pdf · doi:10.1016/j.aop.2012.12.008
published in Annals of Physics 331, 97-109 (Elsevier BV) · 13 pages, 6 figures, elsarticle, final accepted version
openalex publication_date 2013/01/04 · arxiv created 2013/01/20 · arxiv updated 2015/03/19 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We investigate the dynamics of two-photon correlations generated by the interaction of a three-level atom in the Ξ, Λ or V configuration, with two classical external driving fields, under the rotating-wave approximation, in the presence of level decays. Using the example of a rubidium atom in each configuration, with field strengths validating the single-photon approximation, we compute measurement based correlations, such as measurement induced disturbance (MID), quantum discord (QD), and quantum work deficit (WD), and compare the results with that of quantum entanglement (concurrence). Certain correlation properties observed are generic, model independent and consistent with known results, e.g., MID is an upper bound on QD, QD and WD are monotonic, and the generic correlation behavior is strongly affected by the purity of the photon states. We observe that the qualitative hierarchy, monotonicity and steady-state behavior of the correlations can be controlled by the choice of parameters such as atomic decay constants and external driving field strengths. We point out how particular configurations are better suited at generating monotonic correlations in specific regimes and how the steady-state correlation behavior and hierarchy are affected by the population dynamics of the density matrix for different parameters. The possibility of using well studied quantum optical systems such as the three-level atom to generate, characterize and parametrically control mixed state quantum correlations establishes an important step in the direction of their implementation in quantum information tasks.