Atomic vapor quantum memory for a photonic polarization qubit

TL;DR

This paper demonstrates an atomic vapor quantum memory capable of storing photonic polarization qubits with high fidelity for up to 16 microseconds, using electromagnetically-induced transparency in warm Rubidium atoms.

Contribution

The work presents the first experimental realization of a polarization qubit quantum memory in atomic vapor with high process fidelity and measurable storage duration.

Findings

Process fidelity exceeds 0.91 for 16 μs storage

Quantum process tomography confirms high-quality storage

Utilizes electromagnetically-induced transparency in Rubidium vapor

Abstract

We report an experimental realization of an atomic vapor quantum memory for the photonic po- larization qubit. The performance of the quantum memory for the polarization qubit, realized with electromagnetically-induced transparency in two spatially separated ensembles of warm Rubidium atoms in a single vapor cell, has been characterized with quantum process tomography. The process fidelity better than 0.91 for up to 16 \mu s of storage time has been achieved.