# Complete transfer of populations from a single state to a pre-selected superposition of states using Piecewise Adiabatic Passage: Experiment

## TL;DR

This paper demonstrates a robust, complete transfer of quantum populations into a superposition of states using femtosecond pulses and adiabatic passage, enabling precise quantum control without feedback loops.

## Contribution

The study introduces a simple, non-iterative adiabatic method for transferring populations into superpositions, insensitive to laser intensity variations, and analyzes phase and amplitude control.

## Key findings

- Achieved complete population transfer to superpositions.
- Method is robust against laser intensity fluctuations.
- Controlled relative phases and amplitudes of states.

## Abstract

We demonstrate a method of adiabatic population transfer from a single quantum state into a coherent superposition of states. The transfer is executed with femtosecond pulses, spectrally shaped in simple and intuitive manner, which does not require iterative feedback-controlled loops. In contrast to non-adiabatic methods of excitation, our approach is not sensitive to the exact value of laser intensity. We show that the population transfer is complete, and analyze the possibility of controlling the relative phases and amplitudes of the excited eigenstates. We discuss the limitations of the proposed control methods due to the dynamic level shifts and suggest ways of reducing their influence.