Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Bulletin of the American Physical Society

Improving control and coherence of the 0-π qubit

Agustín Di Paolo, Peter Groszkowski, Arne L. Grimsmo, András Gyenis, Andrew Houck, Jens Koch, Alexandre Blais

Published Mar 6, 2018• 0 citations
OpenAlex

Related papers

Properties and Gate Control of the 0-Pi Qubit, Part 1: Disorder and Coherence

Peter Groszkowski, Agustín Di Paolo, Arne L. Grimsmo +2 more

Bulletin of the American Physical Society•Mar 17, 2017•0 citations

Properties and Gate Control of the 0-Pi Qubit, Part 2: Gate Control

Agustín Di Paolo, Arne L. Grimsmo, Peter Groszkowski +2 more

Bulletin of the American Physical Society•Mar 17, 2017•0 citations

Control and coherence time enhancement of the 0–π qubit

Agustín Di Paolo, Arne L. Grimsmo, Peter Groszkowski +2 more

Kitaev’s 0– π qubit encodes quantum information in two protected, near-degenerate states of a superconducting quantum circuit. In a recent work, we have shown that the coherence times of a realistic 0– π device can surpass that of today’s best superconducting qubits (Groszkowski et al 2018 New J. Phys. 20 043053). Here we address controllability of the 0– π qubit. Specifically, we investigate the potential for dispersive control and readout, and introduce a new, fast and high-fidelity single-qubit gate that can interpolate smoothly between logical X and Z . We characterize the action of this gate using a multi-level treatment of the device, and analyze the impact of circuit-element disorder and deviations in control and circuit parameters from their optimal values. Furthermore, we propose a cooling scheme to decrease the photon shot-noise dephasing rate, which we previously found to limit the coherence times of 0– π devices within reach of current experiments. Using this approach, we predict coherence time enhancements between one and three orders of magnitude, depending on parameter regime.

arXiv:1811.07921•New Journal of Physics•Feb 22, 2019•39 citations

Decay-protected superconducting qubit with fast control enabled by integrated on-chip filters

Aashish Sah, Suman Kundu, Heikki Suominen +2 more

Abstract Achieving fast gates and long coherence times for superconducting qubits presents challenges, typically requiring either a stronger coupling of the drive line or an excessively strong microwave signal to the qubit. To address this, we introduce on-chip filters of the qubit drive exhibiting a stopband at the qubit frequency, thus enabling long coherence times and strong coupling at the subharmonic frequency, facilitating fast single-qubit gates, and reduced thermal load. The filters exhibit an extrinsic relaxation time of a few seconds while enabling sub-10-ns gates with subharmonic control. Here we show up to 200-fold improvement in the measured relaxation time at the stopband. Furthermore, we implement subharmonic driving of Rabi oscillations with a π pulse duration of 12 ns. Our demonstration of on-chip filters and efficient subharmonic driving in a two-dimensional quantum processor paves the way for a scalable qubit architecture with reduced thermal load and noise from the control line.

arXiv:2402.08906•Communications Physics•Jul 12, 2024•14 citations

Coherence control for qubits

K. M. Fonseca-Romero, Sigmund Kohler, Peter Hänggi A

arXiv:quant-ph/0307236•Chemical Physics•Oct 17, 2003•40 citations

Experimental realization of the soft 0-π qubit

András Gyenis, Pranav Mundada, Agustín Di Paolo +6 more

Bulletin of the American Physical Society•Mar 16, 2021•0 citations
Kitaev’s 0– π qubit encodes quantum information in two protected, near-degenerate states of a superconducting quantum circuit. In a recent work, we have shown that the coherence times of a realistic 0– π device can surpass that of today’s best superconducting qubits (Groszkowski et al 2018 New J. Phys. 20 043053). Here we address controllability of the 0– π qubit. Specifically, we investigate the potential for dispersive control and readout, and introduce a new, fast and high-fidelity single-qubit gate that can interpolate smoothly between logical X and Z . We characterize the action of this gate using a multi-level treatment of the device, and analyze the impact of circuit-element disorder and deviations in control and circuit parameters from their optimal values. Furthermore, we propose a cooling scheme to decrease the photon shot-noise dephasing rate, which we previously found to limit the coherence times of 0– π devices within reach of current experiments. Using this approach, we predict coherence time enhancements between one and three orders of magnitude, depending on parameter regime.
Abstract Achieving fast gates and long coherence times for superconducting qubits presents challenges, typically requiring either a stronger coupling of the drive line or an excessively strong microwave signal to the qubit. To address this, we introduce on-chip filters of the qubit drive exhibiting a stopband at the qubit frequency, thus enabling long coherence times and strong coupling at the subharmonic frequency, facilitating fast single-qubit gates, and reduced thermal load. The filters exhibit an extrinsic relaxation time of a few seconds while enabling sub-10-ns gates with subharmonic control. Here we show up to 200-fold improvement in the measured relaxation time at the stopband. Furthermore, we implement subharmonic driving of Rabi oscillations with a π pulse duration of 12 ns. Our demonstration of on-chip filters and efficient subharmonic driving in a two-dimensional quantum processor paves the way for a scalable qubit architecture with reduced thermal load and noise from the control line.