Charge Qubit Coupled to an Intense Microwave Electromagnetic Field in a Superconducting Nb Device: Evidence for Photon-Assisted Quasiparticle Tunneling
S. E. de Graaf, J. Leppäkangas, A. Adamyan, A. V. Danilov, T. Lindström, M. Fogelström, T. Bauch, G. Johansson, S. E. Kubatkin
DOI 10.1103/PhysRevLett.111.137002 · Physical Review Letters
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
Abstract
We study a superconducting charge qubit coupled to an intensive electromagnetic field and probe changes in the resonance frequency of the formed dressed states. At large driving strengths, exceeding the qubit energy-level splitting, this reveals the well known Landau-Zener-Stückelberg interference structure of a longitudinally driven two-level system. For even stronger drives, we observe a significant change in the Landau-Zener-Stückelberg pattern and contrast. We attribute this to photon-assisted quasiparticle tunneling in the qubit. This results in the recovery of the qubit parity, eliminating effects of quasiparticle poisoning, and leads to an enhanced interferometric response. The interference pattern becomes robust to quasiparticle poisoning and has a good potential for accurate charge sensing.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Al Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
Similar papers
Strong Single-Photon Coupling in Superconducting Quantum Magnetomechanics
similarity 0.95Guillem Via et al.
Source status unknown — claims are unverified
Quasiparticles in Superconducting Qubits with Asymmetric Junctions
similarity 0.94Giampiero Marchegiani et al.
Source status unknown — claims are unverified
Millimeter-Wave Superconducting Qubit
similarity 0.94Alexander Anferov et al.
Source status unknown — claims are unverified
Nonlinear microwave photon occupancy of a driven resonator strongly coupled to a transmon qubit
similarity 0.94B. Suri et al.
Source status unknown — claims are unverified
Coherent control of a superconducting qubit with dynamically tunable qubit-cavity coupling
similarity 0.93A. J. Hoffman et al.
Source status unknown — claims are unverified
Nondestructive Readout for a Superconducting Flux Qubit
similarity 0.93A. Lupaşcu et al.
Source status unknown — claims are unverified