Quantum state reconstruction on Atom-Chips

TL;DR

This paper demonstrates a practical quantum state tomography method on Atom-Chips using time-resolved atomic population measurements, enabling efficient state and noise estimation with standard experimental procedures.

Contribution

It introduces a simplified, experimentally feasible quantum state reconstruction algorithm that estimates the density matrix and dephasing noise assuming known Hamiltonian dynamics.

Findings

Successful implementation of the tomography scheme on Atom-Chips.

Accurate estimation of quantum states and dephasing noise.

Method relies on routine measurements, simplifying quantum diagnostics.

Abstract

We realize on an Atom-Chip a practical, experimentally undemanding, tomographic reconstruction algorithm relying on the time-resolved measurements of the atomic population distribution among atomic internal states. More specifically, we estimate both the state density matrix as well as the dephasing noise present in our system by assuming complete knowledge of the Hamiltonian evolution. The proposed scheme is based on routinely performed measurements and established experimental procedures, hence providing a simplified methodology for quantum technological applications.