Near-optimal dynamical decoupling of a qubit

TL;DR

This paper introduces a near-optimal dynamical decoupling method for qubits that significantly reduces the number of pulses needed to suppress decoherence, outperforming previous techniques.

Contribution

The authors develop a quantum dynamical decoupling scheme that achieves near-optimal suppression of decoherence with quadratic pulse complexity, a substantial improvement over prior methods.

Findings

Numerical simulations show improved decoherence suppression.

The method uses O(n^2) pulses to eliminate decoherence to order n.

Performance surpasses existing decoupling sequences.

Abstract

We present a near-optimal quantum dynamical decoupling scheme that eliminates general decoherence of a qubit to order n using O(n^2) pulses, an exponential decrease in pulses over all previous decoupling methods. Numerical simulations of a qubit coupled to a spin bath demonstrate the superior performance of the new pulse sequences.