Stability of superconducting resonators: Motional narrowing and the role of Landau-Zener driving of two-level defects

@article{Niepce2020StabilityOS,
  title={Stability of superconducting resonators: Motional narrowing and the role of Landau-Zener driving of two-level defects},
  author={David Niepce and Jonathan J Burnett and Marina Kudra and Jared H. Cole and Jonas Bylander},
  journal={Science Advances},
  year={2020},
  volume={7}
}
Description 

Fluctuation Spectroscopy of Two-Level Systems in Superconducting Resonators

Superconducting quantum computing is experiencing a tremendous growth. Although major milestones have already been achieved, useful quantum-computing applications are hindered by a variety of

Quantifying dynamics and interactions of individual spurious low-energy fluctuators in superconducting circuits

Understanding the nature and dynamics of material defects in superconducting circuits is of paramount importance for improving qubit coherence and parameter stability and much needed for implementing

Identification of different types of high-frequency defects in superconducting qubits

Parasitic two-level-system (TLS) defects are one of the major factors limiting the coherence times of superconducting qubits. Although there has been significant progress in characterizing basic

Fast universal control of an oscillator with weak dispersive coupling to a qubit

and Full manipulation of a quantum system requires controlled evolution generated by nonlinear interactions, which is coherent when the rate of nonlinearity is large compared with the rate of

Feedback stabilization of the resonant frequency in tunable microwave cavities with single-photon occupancy

We successfully demonstrate low-frequency noise suppression in the resonant frequency fluctuations of a cavity-embedded Cooper pair transistor (cCPT) driven at single-photon occupancy. In particular,

Investigation of Microwave Loss Induced by Oxide Regrowth in High- Q Niobium Resonators

The coherence of state-of-the-art superconducting qubit devices is predominantly limited by two-level-system defects, found primarily at amorphous interface layers. Reducing microwave loss from these

References

SHOWING 1-10 OF 73 REFERENCES

Quantum two level systems and kondo-like traps as possible sources of decoherence in superconducting qubits.

It is found that two level systems in the surrounding insulator cannot be the dominant source of noise in small qubits and argued that electron traps in the Josephson barrier with large Coulomb repulsion would emit noise that agrees both in magnitude and in temperature dependence with experimental data.

Fluctuations from edge defects in superconducting resonators

Superconducting resonators, used in astronomy and quantum computation, couple strongly to microscopic two-level defects. We monitor the microwave response of superconducting resonators and observe

Interacting tunneling model for two-level systems in amorphous materials and its predictions for their dephasing and noise in superconducting microresonators

We formulate the generalized tunneling model for two level systems in insulators that takes into account the interaction between them and a slow power law dependence of their density of states. We

Microscopic origin of low-frequency flux noise in josephson circuits.

It is argued that this noise is produced by spins at superconductor insulator boundary whose dynamics is due to RKKY interaction, and this mechanism explains size independence of the noise, different frequency dependences of the spectra reported in large and small SQUIDs, and gives the correct intensity for realistic parameters.

Spectral diffusion dephasing and motional narrowing in single semiconductor quantum dots

In this chapter, we address the extrinsic dephasing mechanism of spectral diffusion that dominates the decoherence in semiconductor quantum dots at cryogenic temperature.We discuss the limits of

Coherent quasiclassical dynamics of a persistent current qubit.

A new regime of coherent quantum dynamics of a qubit is realized at low driving frequencies in the strong driving limit, with an oscillatory dependence of the qubit population on the driving-field amplitude and flux detuning.

Superconducting Microresonators: Physics and Applications

Interest in superconducting microresonators has grown dramatically over the past decade. Resonator performance has improved substantially through the use of improved geometries and materials as well

Dynamical decoupling of quantum two-level systems by coherent multiple Landau–Zener transitions

Increasing and stabilizing the coherence of superconducting quantum circuits and resonators is of utmost importance for various technologies, ranging from quantum information processors to highly

Landau-Zener population control and dipole measurement of a two-level-system bath

Tunneling two-level systems (TLSs), present in dielectrics at low temperatures, have been recently studied for fundamental understanding and superconducting device development. According to a recent

Characterization and reduction of microfabrication-induced decoherence in superconducting quantum circuits

Many superconducting qubits are highly sensitive to dielectric loss, making the fabrication of coherent quantum circuits challenging. To elucidate this issue, we characterize the interfaces and
...