Temperature dependence of coherent oscillations in Josephson phase qubits.

@article{Lisenfeld2007TemperatureDO,
  title={Temperature dependence of coherent oscillations in Josephson phase qubits.},
  author={J{\"u}rgen Lisenfeld and Alexander V. Lukashenko and Markus Ansmann and John M. Martinis and Alexey V. Ustinov},
  journal={Physical review letters},
  year={2007},
  volume={99 17},
  pages={
          170504
        }
}
We experimentally investigate the temperature dependence of Rabi oscillations and Ramsey fringes in superconducting phase qubits. In a wide range of temperatures, we find that both the decay time and the amplitude of these coherent oscillations remain nearly unaffected by thermal fluctuations. In the two-level limit, coherent qubit response rapidly vanishes as soon as the energy of thermal fluctuations k(B)T becomes larger than the energy level spacing variant Planck's over h omega of the qubit… 

Figures from this paper

Multilevel effects in the Rabi oscillations of a Josephson phase qubit
We present Rabi oscillation measurements of a Nb/AlOx/Nb dc superconducting quantum interference device (SQUID) phase qubit with a 100 um^2 area junction acquired over a range of microwave drive
A tunable rf SQUID manipulated as flux and phase qubits
We report on two different manipulation procedures of a tunable rf superconducting quantum interference device (SQUID). First, we operate this system as a flux qubit, where the coherent evolution
Large-amplitude driving of a superconducting artificial atom
TLDR
Three experimental works based on Mach–Zehnder-type interferometry between repeated LZS transitions, microwave-induced cooling, and amplitude spectroscopy are reviewed, anticipating they will find application to qubit state-preparation and control methods for quantum information science and technology.
Coherent oscillations in a superconducting tunable flux qubit manipulated without microwaves
We experimentally demonstrate coherent oscillations of a tunable superconducting flux qubit by manipulating its energy potential with a nanosecond-long pulse of magnetic flux. The occupation
Distinguishing quantum from classical oscillations in a driven phase qubit
Rabi oscillations are coherent transitions in a quantum two-level system under the influence of a resonant drive, with a much lower frequency dependent on the perturbation amplitude. These serve as
Quantum dynamics of superconducting nano-circuits: phase qubit, charge qubit and rhombi chains
TLDR
Theoretical predictions about the current–phase relations of different rhombi chains in the presence or absence of quantum fluctuations are measured to confirm theoretical predictions.
Temperature Dependence of the Energy Relaxation Rate in an RF-SQUID Flux Qubit
From microwave and resonant tunneling spectroscopy measurements we independently obtained all device parameters needed to reconstruct the Hamiltonian of an RF-SQUID flux qubit. Energy relaxation of
The Josephson effect in superconductors and quantum gases
With the recent technical breakthroughs, physicists fully play with the beauty of quantum mechanics. In this theoretical work on the mesoscopic Josephson effect, we take advantage of the
Dispersive readout scheme for a Josephson phase qubit
We present experimental results on a dispersive scheme for reading out a Josephson phase qubit. A capacitively shunted dc-SQUID is used as a nonlinear resonator which is inductively coupled to the
...
1
2
3
4
5
...

References

SHOWING 1-10 OF 19 REFERENCES
Nature
  • R. Rosenfeld
  • Medicine
    Otolaryngology--head and neck surgery : official journal of American Academy of Otolaryngology-Head and Neck Surgery
  • 2009
Phys
  • Rev. B 73, 174507
  • 2006
Phys
  • Rev. Lett. 97, 050502
  • 2006
Phys. Rev. B
  • Phys. Rev. B
  • 2006
Phys. Rev. Lett
  • Phys. Rev. Lett
  • 2006
Science 313
  • 1423
  • 2006
Phys
  • Rev. Lett. 95, 067001
  • 2005
Phys
  • Rev. Lett. 95, 210503
  • 2005
Phys. Rev. Lett
  • Phys. Rev. Lett
  • 2005
Phys. Rev. Lett
  • Phys. Rev. Lett
  • 2005
...
1
2
...