Physics – Condensed Matter – Other Condensed Matter
Scientific paper
2008-02-02
Physics Letters A 372 (2008) 3476
Physics
Condensed Matter
Other Condensed Matter
20 pages, no figures
Scientific paper
10.1016/j.physleta.2008.01.064
Phonon-related decoherence effects in a quantum double-well two-level subsystem coupled to a solid are studied theoretically by the example of deformation phonons. Expressions for the reduced density matrix at T=0 are derived beyond the Markovian approximation by means of explicit solution of the non-stationary Schrodinger equation for the interacting electron-phonon system at the initial stage of its evolution. It is shown that as long as the difference between the energies of the electron in the left and the right well greatly exceeds the energy of the electron tunneling between the minima of the double-well potential, decoherence is primarily due to dephasing processes. This case corresponds to a strongly asymmetric potential and spatially separated eigenfunctions localized in the vicinity of one or another potential minimum. In the opposite case of the symmetric potential, the decoherence stems from the relaxation processes, which may be either "resonant" (at relatively long times) or "nonresonant" (at short times), giving rise to qualitatively different temporal evolution of the electron state. The results obtained are discussed in the context of quantum information processing based on the quantum bits encoded in electron charge degrees of freedom.
No associations
LandOfFree
Phonon-induced decoherence of the two-level quantum subsystem due to relaxation and dephasing processes does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Phonon-induced decoherence of the two-level quantum subsystem due to relaxation and dephasing processes, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Phonon-induced decoherence of the two-level quantum subsystem due to relaxation and dephasing processes will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-189543