Detuning modulated universal composite pulses

TL;DR

This paper introduces a general method for designing detuning-modulated composite pulses that are highly robust against errors, suitable for quantum information processing and photonics, with minimal overhead and broad applicability.

Contribution

The authors develop a universal scheme for detuning-modulated composite pulses applicable to multi-level systems, enhancing robustness and reducing fabrication and initialization errors.

Findings

Achieves amplitude error stability within 10^{-4} threshold.

Extends universal pulses to n-level systems with SU(2) symmetry.

Reduces need for precise initial state preparation.

Abstract

We present a general method to derive detuning-modualted composite pulses (DMCPs) as N rotations of a canonical two-state quantum system to create accurate and robust pulses that are independent of the initial state of the system. This scheme has minimal pulse overhead, and achieves pulses that are stable against amplitude errors well within the $10^{-4}$ threshold that may be suitable for quantum information processing (QIP), within the lifetime of the system. This family of pulses enables to overcome inevitable fabrication errors in silicon photonics, and relax the need for a precise initial state of light coupled into the system to achieve accurate light transfer. Furthermore, we extend universal DMCPs to n-level systems with irreducible SU(2) symmetry to create state transfer that is highly robust to errors in the pulse area from any initial state.