Quantum Control in Qutrit Systems using Hybrid Rabi-STIRAP Pulses

TL;DR

This paper presents a theoretical and experimental approach combining Rabi and STIRAP pulses for high-fidelity quantum control in three-level qutrit systems, with potential applications in various quantum platforms.

Contribution

It introduces a hybrid Rabi-STIRAP protocol for precise state manipulation in qutrits, demonstrating its feasibility in circuit QED with transmons.

Findings

High-fidelity control of level populations achieved

Successful implementation in circuit QED with transmons

Analysis of errors from adiabaticity breakdown

Abstract

We introduce and analyze theoretically a procedure that combines slow adiabatic STIRAP manipulation with short nonadiabatic Rabi pulses to produce any desired three-level state in a qutrit system. In this protocol, the fast pulses create superpositions between the ground state and the first excited state, while the slow pulses transfer an arbitrary population to the second excited state via stimulated Raman adiabatic passage (STIRAP). We demonstrate high-fidelity quantum control of the level populations and phases and we characterize the errors incurred under the breakdown of adiabaticity. In a configuration where an ancillary state is available, we show how to realize a nondemolition monitoring of the relative phases. These methods are general and can be implemented on any experimental platform where a quantum system with at least three accessible energy levels is available. We discuss here in detail experimental implementations in circuit quantum electrodynamics (QED) based on the results obtained with a transmon, where the control of population using the hybrid Rabi-STIRAP sequence has been achieved.