Dissipative Landau-Zener transitions of a qubit: bath-specific and universal behavior

Physics – Condensed Matter – Mesoscale and Nanoscale Physics

Scientific paper

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

16 pages, 8 figures

Scientific paper

10.1103/PhysRevB.75.214308

We study Landau-Zener transitions in a qubit coupled to a bath at zero temperature. A general formula is derived that is applicable to models with a non-degenerate ground state. We calculate exact transition probabilities for a qubit coupled to either a bosonic or a spin bath. The nature of the baths and the qubit-bath coupling is reflected in the transition probabilities. For diagonal coupling, when the bath causes energy fluctuations of the diabatic qubit states but no transitions between them, the transition probability coincides with the standard LZ probability of an isolated qubit. This result is universal as it does not depend on the specific type of bath. For pure off-diagonal coupling, by contrast, the tunneling probability is sensitive to the coupling strength. We discuss the relevance of our results for experiments on molecular nanomagnets, in circuit QED, and for the fast-pulse readout of superconducting phase qubits.

No associations

LandOfFree

Say what you really think

Search LandOfFree.com for scientists and scientific papers. Rate them and share your experience with other people.

Rating

Dissipative Landau-Zener transitions of a qubit: bath-specific and universal behavior 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 Dissipative Landau-Zener transitions of a qubit: bath-specific and universal behavior, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Dissipative Landau-Zener transitions of a qubit: bath-specific and universal behavior will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFWR-SCP-O-164327

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.