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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 SocietyMar 17, 20170 citations

Characterization of a π-phase shift quantum gate for coherent-state qubits

Rémi Blandino, Franck Ferreyrol, Marco Barbieri +2 more

Nov 23, 20110 citations

Improving control and coherence of the 0-π qubit

Agustín Di Paolo, Peter Groszkowski, Arne L. Grimsmo +4 more

Bulletin of the American Physical SocietyMar 6, 20180 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.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:1811.07921New Journal of PhysicsFeb 22, 201939 citations

Two-qubit gates for the soft 0-π qubit

Zhenxing Liu, Eli Weissler, Joshua Combes

The 0-π qubit promises longer lifetimes than the transmon, making it a strong candidate for a next-generation, lower-error qubit. Gyenis et al. experimentally demonstrated an unprotected single-qubit gate in the soft 0-π regime [1], but no corresponding two-qubit gate has yet been proposed. We propose an unprotected CZ gate for capacitively coupled soft 0-π qubits. The gate uses a direct transition between a computational state and a higher non-computational state. Assuming negligible device disorder and a phenomenological noise model, the simulated CZ gate achieves a fidelity of approximately 99.9% at a gate time of approximately 160 ns.The 0-π qubit promises longer lifetimes than the transmon, making it a strong candidate for a next-generation, lower-error qubit. Gyenis et al. experimentally demonstrated an unprotected single-qubit gate in the soft 0-π regime [1], but no corresponding two-qubit gate has yet been proposed. We propose an unprotected CZ gate for capacitively coupled soft 0-π qubits. The gate uses a direct transition between a computational state and a higher non-computational state. Assuming negligible device disorder and a phenomenological noise model, the simulated CZ gate achieves a fidelity of approximately 99.9% at a gate time of approximately 160 ns.

quant-pharXiv:2609.16630Sep 16, 20260 citations

Towards High-Fidelity Gates in the Soft Zero-Pi Qubit

Anjali Premkumar, András Gyenis, Xanthe Croot +5 more

Bulletin of the American Physical SocietyMar 19, 20210 citations

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

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