Composite stimulated Raman adiabatic passage

TL;DR

This paper presents a high-fidelity quantum control method that combines STIRAP and composite pulses, using analytic phase sequences to cancel nonadiabatic errors and achieve arbitrary accuracy in three-state systems.

Contribution

It introduces a universal composite phase protocol that enhances STIRAP fidelity by canceling nonadiabatic transitions to any order.

Findings

Achieves near-perfect fidelity in three-state quantum control

Provides simple analytic formulas for composite phases

Demonstrates robustness across different pulse parameters

Abstract

We introduce a high-fidelity technique for coherent control of three-state quantum systems, which combines two popular control tools --- stimulated Raman adiabatic passage (STIRAP) and composite pulses. By using composite sequences of pairs of partly delayed pulses with appropriate phases the nonadiabatic transitions, which prevent STIRAP from reaching unit fidelity, can be canceled to an arbitrary order by destructive interference, and therefore the technique can be made arbitrarily accurate. The composite phases are given by simple analytic formulas, and they are universal for they do not depend on the specific pulse shapes, the pulse delay and the pulse areas.