Quantum tunneling of a single semifluxon in a 0-pi Josephson junction

Details Quantum tunneling of a single semifluxon in a 0-pi Josephson junction Quantum tunneling of a single semifluxon in a 0-pi Josephson junction

2008-12-12

arxiv.org/abs/0812.2394v1

Phys. Rev. B 81, 054514 (2010)

Physics

Condensed Matter

Superconductivity

submitted to PRB

Scientific paper

10.1103/PhysRevB.81.054514

We consider a symmetric 0-pi Josephson junction of length $L$, which classically can be in one of two degenerate ground states up or down, corresponding to supercurrents circulating clockwise or counterclockwise around the 0-pi boundary. When the length $L$ of the junction becomes smaller than the Josephson penetration depth $\lambda_J$, the system can switch from one state to the other due to thermal fluctuations or quantum tunneling. We map this problem to the dynamics of a single particle in a periodic double well potential and estimate parameters for which macroscopic quantum coherence may be observed. We conclude that this system is not very promising to build a qubit because (a) it requires very low temperatures to reach the quantum regime, (b) its tiny flux is hard to read out and (c) it is very sensitive to the asymmetries between the 0 and pi parts of the junction.

Affiliated with

Also associated with

No associations

Rating

Quantum tunneling of a single semifluxon in a 0-pi Josephson junction 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 Quantum tunneling of a single semifluxon in a 0-pi Josephson junction, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Quantum tunneling of a single semifluxon in a 0-pi Josephson junction will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-610365