Here we show an ultra-low noise regime of operation in a simple quantum memory in warm Rb atomic vapor. By modelling the quantum dynamics of four-level room temperature atoms, we achieve fidelities >90% for single-photon level polarization qubits, clearly surpassing any classical strategy exploiting the non-unitary memory efficiency. This is the first time such important threshold has been crossed with a room temperature device. Additionally we also show novel experimental techniques capable of producing fidelities close to unity. Our results demonstrate the potential of simple, resource-moderate experimental room temperature quantum devices.
@article{arxiv.1512.07374,
title = {Ultra-low-noise room-temperature quantum memory for polarization qubits},
author = {Mehdi Namazi and Connor Kupchak and Bertus Jordaan and Reihaneh Shahrokhshahi and Eden Figueroa},
journal= {arXiv preprint arXiv:1512.07374},
year = {2017}
}