Interacting defects generate stochastic fluctuations in superconducting qubits

@article{Bjanin2021InteractingDG,
  title={Interacting defects generate stochastic fluctuations in superconducting qubits},
  author={J{\'e}r{\'e}my H. B{\'e}janin and C. T. Earnest and Abdelrahman Sharafeldin and Matteo Mariantoni},
  journal={Physical Review B},
  year={2021}
}
Amorphous dielectric materials have been known to host two-level systems (TLSs) for more than four decades. Recent developments on superconducting resonators and qubits enable detailed studies on the physics of TLSs. In particular, measuring the loss of a device over long time periods (a few days) allows us to investigate stochastic fluctuations due to the interaction between TLSs. We measure the energy relaxation time of a frequency-tunable planar superconducting qubit over time and frequency… 
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References

SHOWING 1-10 OF 55 REFERENCES
Interacting two-level defects as sources of fluctuating high-frequency noise in superconducting circuits
Since the very first experiments, superconducting circuits have suffered from strong coupling to environmental noise, destroying quantum coherence and degrading performance. In state-of-the-art
Evidence for interacting two-level systems from the 1/f noise of a superconducting resonator.
TLDR
Measurements on superconducting microresonators over previously unattainable, very long time scales that show an increase in 1/f noise at low temperatures and low microwave power, contrary to the STM are reported.
Coherent Josephson qubit suitable for scalable quantum integrated circuits.
TLDR
This work demonstrates a planar, tunable superconducting qubit with energy relaxation times up to 44 μs and finds a fine structure in the qubit energy lifetime as a function of frequency, indicating the presence of a sparse population of incoherent, weakly coupled two-level defects.
Fluctuations of Energy-Relaxation Times in Superconducting Qubits.
TLDR
This research uses qubits as spectral and temporal probes of individual two-level-system defects to provide direct evidence that they are responsible for the largest fluctuations in superconducting qubits.
Observation of high coherence in Josephson junction qubits measured in a three-dimensional circuit QED architecture.
TLDR
A new architecture for superconducting quantum circuits employing a three-dimensional resonator that suppresses qubit decoherence while maintaining sufficient coupling to the control signal is introduced, demonstrating that Josephson junction qubits are highly coherent.
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
Suppression of low-frequency charge noise in superconducting resonators by surface spin desorption
TLDR
By combining dielectric loss, frequency noise and on-chip electron spin resonance measurements in superconducting resonators, it is demonstrated that desorption of surface spins is accompanied by an almost tenfold reduction in the charge-induced frequency noise in the resonators.
Protecting superconducting qubits from phonon mediated decay
For quantum computing to become fault tolerant, the underlying quantum bits must be effectively isolated from the noisy environment. It is well known that including an electromagnetic bandgap around
Improved superconducting qubit coherence with high-temperature substrate annealing
We assess independently the impact of high-temperature substrate annealing and metal deposition conditions on the coherence of transmon qubits in the standard 2D circuit-QED architecture. We restrict
Improving the Time Stability of Superconducting Planar Resonators
Quantum computers are close to become a practical technology. Solid-state implementations based, for example, on superconducting devices strongly rely on the quality of the constituent materials. In
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5
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