Title :
Decoherence control by homodyne-mediated feedback
Author :
Wang, Jiacheng ; Wiseman, H.M. ; Milburn, G.J.
Author_Institution :
Dept. of Phys., Queensland Univ., Brisbane, Qld., Australia
Abstract :
Summary form only given. Decoherence in quantum systems can be loosely defined as loss of purity. Therefore the ultimate success in using feedback to fight decoherence would be to create an arbitrary stable pure state in the presence of dissipation. This goal was realized by Hoffman, Mahler and Hess (1998) for a very simple system: a resonantly driven two-level atom. They showed that by making part of the coherent driving proportional to the homodyne photocurrent can stabilize the state to any point on the bottom half of the sphere. Here we reanalyze their proposal by using the technique of stochastic master equations, allowing their results to be generalized in three ways.
Keywords :
Markov processes; coherence; feedback; master equation; quantum noise; Bloch equations; Markovian process; arbitrary stable pure state; decoherence control; dissipation; dynamical noise; homodyne photocurrent; homodyne-mediated feedback; resonantly driven two-level atom; stationary states; steady-state quantum trajectory; stochastic master equations; Delay effects; Laser beams; Laser feedback; Local oscillators; Optical feedback; Photoconductivity; Quantum computing; Quantum mechanics; State feedback; Stationary state;
Conference_Titel :
Quantum Electronics and Laser Science Conference, 2001. QELS '01. Technical Digest. Summaries of Papers Presented at the
Conference_Location :
Baltimore, MD, USA
Print_ISBN :
1-55752-663-X
DOI :
10.1109/QELS.2001.961903
