Synchronization and bistability of qubit coupled to a driven dissipative oscillator

Details Synchronization and bistability of qubit coupled to a driven dissipative oscillator Synchronization and bistability of qubit coupled to a driven dissipative oscillator

2007-10-10

arxiv.org/abs/0710.1967v1

Phys. Rev. Lett. v.100, p.014101 (2008)

Physics

Condensed Matter

Superconductivity

revtex 4 pages, 6 figs, research at http://www.quantware.ups-tlse.fr/

Scientific paper

10.1103/PhysRevLett.100.014101

We study numerically the behavior of qubit coupled to a quantum dissipative driven oscillator (resonator). Above a critical coupling strength the qubit rotations become synchronized with the oscillator phase. In the synchronized regime, at certain parameters, the qubit exhibits tunneling between two orientations with a macroscopic change of number of photons in the resonator. The life times in these metastable states can be enormously large. The synchronization leads to a drastic change of qubit radiation spectrum with appearance of narrow lines corresponding to recently observed single artificial-atom lasing [O. Astafiev {\it et al.} Nature {\bf 449}, 588 (2007)].

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