Fast Gates of Detuned Cat Qubit

TL;DR

This paper investigates the effects of detuning in cat qubit gates, demonstrating that high-fidelity single and multi-qubit gates are achievable with proper parameter tuning and adiabatic corrections, enhancing quantum computation robustness.

Contribution

It introduces a modified Hamiltonian approach for detuned cat qubits, enabling high-fidelity gates without zero detuning assumption, and applies Shortcut to Adiabaticity for improved CNOT gate fidelity.

Findings

High-fidelity gates are possible with detuning through parameter matching.

Detuning can be mitigated using Shortcut to Adiabaticity corrections.

Fidelity improvements are demonstrated for single and multi-qubit gates.

Abstract

Cat qubits have emerged as a promising candidate for quantum computation due to their higher error-correction thresholds and low resource overheads. In existing literature, the detuning of the two-photon drive is assumed to be zero for implementing single and multi-qubit gates. We explore a modification of the Hamiltonian for a range of detuning and demonstrate that high fidelity single qubit gates can be performed even by proper parameter matching. We also analyze the CNOT gate in presence of an approximate detuning term and explain its fidelity improvements through Shortcut to Adiabaticity corrections.