A. Ravi P. Rau, Ph.D.

A. Ravi P. Rau , PhD
Professor of Physics

Ph.D., 1970 - University of Chicago

Louisiana State University
Department of Physics & Astronomy
223 Nicholson Hall, Tower Dr.
Baton Rouge, LA 70803-4001
(225) 578-6841-Office

Personal Home Page

Research Interests

Atomic Theory
Quantum Information

Currently, I am exploring a general analytical technique for solving time-dependent operator equations through a succession of unitary integrations. The Bloch-Liouville equation for a (2j+1)-level system in time-dependent fields is of particular interest, along with current topics in nuclear magnetic resonance and quantum bits. The method extends to dissipation and decoherence which are of great interest in quantum information and quantum computing. Proceeding in analogy to the Bloch sphere construction for a single spin (two-level system), a geometrical construction describes higher dimensional spheres and other manifolds for two-spin and larger systems. A related investigation is to alter the evolution of entanglement between two spins in the presence of dissipation and decoherence. The so-called sudden death of entanglement can be delayed or averted by suitable local actions on the two spins.

Current and Selected Publications

• A. R. P. Rau and D. Uskov, "Effective Hamiltonians in quantum physics: Resonances and Geometric Phase," Physica Scripta 74 (2), C31-C35 (2006).
• D. Uskov and A.R.P. Rau, "Geometric phases for N-level systems through unitary integration," Phys. Rev. A 74, 030304 (R) (2006).
• I. Mazumdar, A.R.P. Rau, and V.S. Bhasin, "Efimov states and their Fano resonances in neutron rich nuclei," Phys. Rev. Lett. 97, 062503 (2006).
• A. R. P. Rau, Mazhar Ali, and G. Alber, "Hastening, delaying, or averting the sudden death of quantum entanglement," Europhys. Lett. 82, 40002 (2008).