Non-Markovian Quantum Optical Processes and Pseudomodes

✍ Scribed by B.J. Dalton; Stephen M. Barnett; B.M. Garraway

• Publisher: John Wiley and Sons
• Year: 2001
• Tongue: English
• Weight: 94 KB
• Volume: 49
• Category: Article
• ISSN: 0015-8208
• DOI: 10.1002/1521-3978(200110)49:10/11<927::aid-prop927>3.0.co;2-f

✦ Synopsis

Non-Markovian behaviour in atomic systems coupled to a structured reservoir of quantum EM field modes, such as in high Q cavities, is treated using a quasimode description, and the pseudo mode theory for single quantum reservoir excitations is obtained via Fano diagonalisation. The atomic transitions are coupled to a discrete set of (cavity) quasimodes, which are also coupled to a continuum set of (external) quasimodes with slowly varying coupling constants. Each pseudomode corresponds to a cavity quasimode, and the original reservoir structure is obtained in expressions for the equivalent atom-true mode coupling constants. Cases of multiple excitation of the reservoir are now treatable via Markovian master equations for the atom-discrete quasimode system.