Low-Weight Pauli Hamiltonian Sequences for Noise-Resilient Quantum Gates

TL;DR

This paper introduces a low-weight Pauli Hamiltonian protocol for noise-resilient quantum gates, enabling robust, low-overhead quantum operations suitable for experimental implementation and immunity to energy relaxation.

Contribution

The paper presents a novel adiabatic sequence using low-weight Pauli interactions for quantum gates, reducing complexity compared to existing methods and enhancing noise resilience.

Findings

Gate error due to control noise can be as low as 10^-5.

Operation is feasible with realistic coupling strengths and time-scales.

Method is robust against high levels of low-frequency noise.

Abstract

A simple protocol based on low-weight Pauli Hamiltonians is introduced for performing quantum gates that are robust to control noise. Gates are implemented by an adiabatic sequence of single-qubit fields and two-qubit interactions with a single ancillary qubit, whereas related techniques require three-qubit interactions, perturbation gadgets, higher dimensional subsystems, and/or more ancilla qubits. Low-weight interactions and low qubit overhead open a viable path to experimental investigation, while operation in a degenerate ground space allows for physical qubit designs that are immune to energy relaxation. Simulations indicate that two-qubit gate error due to control noise can be as low as $10^{-5}$, for realizable coupling strengths and time-scales, with low-frequency noise that is as high as 15% of the control pulse amplitude.