# Universal Fast-Flux Control of a Coherent, Low-Frequency Qubit

@article{Zhang2020UniversalFC,
title={Universal Fast-Flux Control of a Coherent, Low-Frequency Qubit},
author={Helin Zhang and Srivatsan Chakram and Tanay Roy and Nathan Earnest and Yao Lu and Ziwen Huang and Daniel Weiss and Jens Koch and David I. Schuster},
journal={arXiv: Quantum Physics},
year={2020}
}
• Published 24 February 2020
• Physics
• arXiv: Quantum Physics
The \textit{heavy-fluxonium} circuit is a promising building block for superconducting quantum processors due to its long relaxation and dephasing time at the half-flux frustration point. However, the suppressed charge matrix elements and low transition frequency have made it challenging to perform fast single-qubit gates using standard protocols. We report on new protocols for reset, fast coherent control, and readout, that allow high-quality operation of the qubit with a 14 MHz transition…

## Figures and Tables from this paper

Universal Nonadiabatic Control of Small-Gap Superconducting Qubits
• Physics
• 2020
Resonant transverse driving of a two-level system as viewed in the rotating frame couples two degenerate states at the Rabi frequency, an amazing equivalence that emerges in quantum mechanics. While
Engineering Dynamical Sweet Spots to Protect Qubits from 1/f Noise
• Physics
Physical Review Applied
• 2020
Protecting superconducting qubits from low-frequency noise is essential for advancing superconducting quantum computation. We here introduce a protocol for engineering dynamical sweet spots which
Fast Logic with Slow Qubits: Microwave-Activated Controlled-Z Gate on Low-Frequency Fluxoniums
• Physics
• 2020
We demonstrate a controlled-Z gate between capacitively coupled fluxonium qubits with transition frequencies $72.3~\textrm{MHz}$ and $136.3~\textrm{MHz}$. The gate is activated by a
Electron shelving of a superconducting artificial atom
• Physics
Nature communications
• 2021
This work establishes a resource-efficient (cavityless) alternative to cQED for controlling superconducting qubits by detecting a homodyne fluorescence signal from the cycling transition and implementing a QND readout of the qubit.
Scalable High-Performance Fluxonium Quantum Processor
• Biology
• 2022
This paper presents a parallel version of the Celada–Seiden cellular automaton that automates the very labor-intensive and therefore time-heavy and therefore expensive and expensive and therefore difficult to fabricate in the laboratory.
Stabilizing and improving qubit coherence by engineering noise spectrum of two-level systems
• Physics
• 2022
The coherence times of many widely used superconducting qubits are limited by material defects that can be modeled as an ensemble of two-level systems (TLSs). Among them, charge fluctuators inside
Microwave-activated gates between a fluxonium and a transmon qubit
• Physics
• 2022
A. Ciani, 2 B. M. Varbanov, N. Jolly, 3 C. K. Andersen, 4 and B. M. Terhal 5, 6 Institute for Quantum Computing Analytics (PGI-12), Forschungszentrum Jülich, 52425 Jülich, Germany QuTech, Delft
High-Order Qubit Dephasing at Sweet Spots by Non-Gaussian Fluctuators: Symmetry Breaking and Floquet Protection
• Physics
• 2022
Although the Gaussian-noise assumption is widely adopted in the study of qubit decoherence, non-Gaussian noise sources, especially the strong discrete ﬂuctuators, have been detected in many qubits.
Bound states in the continuum in a heavy ﬂuxonium qutrit
• Physics
• 2022
The heavy ﬂuxonium at zero external ﬂux has a long-lived state when coupled capacitively to any other system. We analyze it by projecting all the ﬂuxonium relevant operators into the qutrit subspace,

## References

SHOWING 1-10 OF 72 REFERENCES
I
• Engineering
Edinburgh Medical and Surgical Journal
• 1824
AIV Assembly, Integration, Verification AOA Angle of Attack CAD Computer Aided Design CFD Computational Fluid Dynamics GLOW Gross Lift-Off Mass GNC Guidance Navigation and Control IR Infra-Red LEO
d.
• Biology
Microbial pathogenesis
• 2021
The novel JEV RT-NASBA assay could be used as an efficient molecular biology tool to diagnose JEV, which would facilitate the surveillance of reproductive failure disease in swine and would be beneficial for public health security.
{m
• Geology
ACML
• 2020
The master programme in Applied Geology aims to provide comprehensive knowledge based on various branches of Geology, with special focus on Applied geology subjects in the areas of Geomorphology, Structural geology, Hydrogeology, Petroleum Geologists, Mining Geology), Remote Sensing and Environmental geology.
Phys
• Rev. X 9, 041041
• 2019
‘S’
• P. Alam
• Composites Engineering: An A–Z Guide
• 2021
‘G’
• P. Alam
• Composites Engineering: An A–Z Guide
• 2021
[C]
• Thomas de Quincey
• Physics
The Works of Thomas De Quincey, Vol. 1: Writings, 1799–1820
• 2000
In supernova (SN) spectroscopy relatively little attention has been given to the properties of optically thick spectral lines in epochs following the photosphere’s recession. Most treatments and
‘A’
• P. Alam
• Composites Engineering: An A–Z Guide
• 2021
‘E’
• P. Alam
• Composites Engineering: An A–Z Guide
• 2021
and s
• Shallow Water Hydraulics
• 2019