The author has brought to our attention that, due to an unfortunate typing and transfer error, there have been systematic mistakes concerning the Hamiltonian terms.
Instead of using the product of operators with their complex conjugated counterparts, all products were written as products using complex conjugates only (i.e. two complex conjugates in the terms), like a°a°. This has now been corrected on all occurrences throughout the text and in the equations.
The correct version is available at
All versions accessed or downloaded earlier than 14 June 2013 are to be dismissed.
The publisher apologizes for these mistakes and any inconvenience they may have caused to our readers.