Cross-coupling effects in circuit-QED stimulated Raman adiabatic passage

A Vepsäläinen,G S Paraoanu

doi:10.1088/1742-6596/969/1/012141

A Vepsäläinen, G S Paraoanu

Open Access

https://doi.org/10.1088/1742-6596/969/1/012141

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Journal: Journal of Physics: Conference Series	Publication Date: Mar 1, 2018
Citations: 1	License type: cc-by

Affiliation: Aalto University

Abstract

Stimulated Raman adiabatic passage is a quantum protocol that can be used for robust state preparation in a three-level system. It has been commonly employed in quantum optics, but recently this technique has drawn attention also in circuit quantum electrodynamics. The protocol relies on two slowly varying drive pulses that couple the initial and the target state via an intermediate state, which remains unpopulated. Here we study the detrimental effect of the parasitic couplings of the drives into transitions other than those required by the protocol. The effect is most prominent in systems with almost harmonic energy level structure, such as the transmon. We show that under these conditions in the presence of decoherence there exists an optimal STIRAP amplitude for population transfer.

Highlights

Adiabatic pulse sequences can be used to transfer population between the states of a quantum system
It has been commonly employed in quantum optics, but recently this technique has drawn attention in circuit quantum electrodynamics
The downside of the adiabatic methods is their inherent slowness: population transfer is based on the adiabatic theorem [3], according to which the system remains in its instantenous eigenstate as long as the Hamiltonian governing the evolution of the system changes slow enough

Summary

Introduction

Adiabatic pulse sequences can be used to transfer population between the states of a quantum system. Stimulated Raman adiabatic passage is a quantum protocol that can be used for robust state preparation in a three-level system. The protocol relies on two slowly varying drive pulses that couple the initial and the target state via an intermediate state, which remains unpopulated. We study the detrimental effect of the parasitic couplings of the drives into transitions other than those required by the protocol.

Results

Conclusion