Universal set of scalable dynamically corrected gates for quantum error correction with always-on qubit couplings

TL;DR

This paper develops a universal set of high-fidelity, scalable quantum gates that operate on always-on qubit couplings, utilizing dynamical decoupling and shaped pulses to enable effective quantum error correction.

Contribution

It introduces a novel method for constructing universal quantum gates compatible with always-on couplings, suitable for error correction in sparse bipartite lattices.

Findings

Gates protect against low-frequency phase noise.

Gates can be run in parallel on non-neighboring qubits.

Simulation demonstrates effectiveness with the $[[4,2,2]]$ toric code.

Abstract

We construct a universal set of high fidelity quantum gates to be used on a sparse bipartite lattice with always-on Ising couplings. The gates are based on dynamical decoupling sequences using shaped pulses, they protect against low-frequency phase noise, and can be run in parallel on non-neighboring qubits. This makes them suitable for implementing quantum error correction with low-density parity check codes like the surface codes and their finite-rate generalizations. We illustrate the construction by simulating quantum Zeno effect with the $[[4,2,2]]$ toric code on a spin chain.