Deterministic quantum state transfer of atoms in a random magnetic field

TL;DR

This paper introduces a feedback-based method for reliably transferring atoms between quantum states in a multilevel system, even under unpredictable magnetic field conditions, enhancing control in quantum information processing.

Contribution

It presents a novel real-time feedback algorithm for deterministic quantum state transfer in multilevel atoms under random magnetic fields.

Findings

Successful transfer of specific atomic states in ultracold rubidium despite magnetic field randomness

Real-time feedback improves transfer reliability in uncertain environments

Method applicable to quantum control in noisy conditions

Abstract

We propose a method for transferring atoms to a target quantum state for a multilevel quantum system with sequentially increasing, but otherwise unknown, energy splitting. This is achieved with a feedback algorithm that processes off-resonant optical measurements of state populations during adiabatic rapid passage in real-time. Specifically, we reliably perform the transfer $|F=2,m_F=2\rangle \rightarrow |1,1\rangle \rightarrow |2,1\rangle$ for a sample of ultracold $^{87}$Rb in the presence of a random external magnetic field.