Physics – Quantum Physics
Scientific paper
2001-12-14
Quantum Information Processing_1_, 55 (2002)
Physics
Quantum Physics
REVTeX 4, 14 p.; 1 built-in + 1 PS figure; N.B. `Alec' is my first name, `Maassen van den Brink' my family name; Pls delete th
Scientific paper
The density-matrix and Heisenberg formulations of quantum mechanics follow--for unitary evolution--directy from the Schr"odinger equation. Nevertheless, the symmetries of the corresponding evolution operator, the Liouvillian L=i[.,H], need not be limited to those of the Hamiltonian H. This is due to L only involving eigenenergy_differences_, which can be degenerate even if the energies themselves are not. Remarkably, this possibility has rarely been mentioned in the literature, and never pursued more generally. We consider an example involving mesoscopic Josephson devices, but the analysis only assumes familiarity with basic quantum mechanics. Subsequently, such _L-symmetries_ are shown to occur more widely, in particular also in classical mechanics. The symmetry's relevance to dissipative systems and quantum-information processing is briefly discussed.
den Brink Alec Maassen van
Zagoskin Alexandre M.
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