Dynamics and phonon-induced decoherence of Andreev level qubit
Artikel i vetenskaplig tidskrift, 2005

We present a detailed theory for the Andreev level qubit, a system consisting of a highly transmissive quantum point contact embedded in a superconducting loop. The two-level Hamiltonian for Andreev levels interacting with quantum phase fluctuations is derived by using a path integral method. We also derive a kinetic equation describing qubit decoherence due to interaction of the Andreev levels with acoustic phonons. The collision terms are nonlinear due to the fermionic nature of the Andreev states, leading to slow nonexponential relaxation and dephasing of the qubit at temperatures smaller than the qubit level spacing.

Författare

A. Zazunov

Chalmers, Mikroteknologi och nanovetenskap (MC2), Tillämpad kvantfysik

Vitaly Shumeiko

Chalmers, Mikroteknologi och nanovetenskap (MC2), Tillämpad kvantfysik

E.N. Bratus'

Institute for Low Temperature Physics and Engineering

Göran Wendin

Chalmers, Mikroteknologi och nanovetenskap (MC2), Tillämpad kvantfysik

Physical Review B - Condensed Matter and Materials Physics

1098-0121 (ISSN)

Vol. 71 214505

Ämneskategorier

Oorganisk kemi

Annan fysik

Systemvetenskap, informationssystem och informatik med samhällsvetenskaplig inriktning

Den kondenserade materiens fysik

DOI

10.1103/PhysRevB.71.214505

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Senast uppdaterat

2018-09-07