Synchronization and bistability of qubit coupled to a driven dissipative oscillator

O. V. Zhirov , Dima Shepelyansky (1)

1 ICQ - Cohérence Quantique (LPT)

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)].

Domaines: Supraconductivité [cond-mat.supr-con]; Autre [cond-mat.other]

O. V. Zhirov, Dima Shepelyansky. Synchronization and bistability of qubit coupled to a driven dissipative oscillator. Physical Review Letters, 2008, 100, pp.014101. ⟨10.1103/PhysRevLett.100.014101⟩. ⟨hal-00181019⟩