Physics – Quantum Physics
Scientific paper
2010-02-20
Physics
Quantum Physics
8 pages, text amended, 1 figure added
Scientific paper
The standard phenomenological Hamiltonian of a small superconducting Josephson junction in the charge regime (Cooper Pair Box) produces a model of the effective charge qubit with possible applications to quantum information processing. In this note a new model based on the BCS Hamiltonian with individual tunneling yields an effective multi-level picture with a highly degenerated level placed between the ground state and the excited state. Unlike in the standard approach, the excited Cooper pairs play here an important role. For such a system coupled to a zero temperature bath the additional levels act as a probability sink. In contrast to the standard large-spin model the coupling to phonons can be an effective source of dissipation. This model provides also alternative explanations of various effects observed in experiments and sheds new light on the issue of Josephson junctions as macroscopic quantum systems.
No associations
LandOfFree
BCS model of Cooper Pair Box 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 BCS model of Cooper Pair Box, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and BCS model of Cooper Pair Box will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-692838