Quantum memory in warm rubidium vapor with buffer gas

TL;DR

This paper demonstrates the implementation of quantum memory in warm rubidium vapor cells with buffer gas, showing quantum correlations for delays up to 4 microseconds, simplifying experimental setups.

Contribution

It provides the first clear demonstration of quantum memory in a single warm vapor cell with buffer gas using nearly co-propagating beams.

Findings

Cross-correlation values > 2 indicating quantum states

Quantum memory effective for delays up to 4 microseconds

Simplifies experimental realization of quantum memory

Abstract

The realization of quantum memory using warm atomic vapor cells is appealing because of their commercial availability and the perceived reduction in experimental complexity. In spite of the ambiguous results reported in the literature, we demonstrate that quantum memory can be implemented in a single cell with buffer gas using the geometry where the write and read beams are nearly co-propagating. The emitted Stokes and anti-Stokes photons display cross-correlation values greater than 2, characteristic of quantum states, for delay times up to 4 microseconds.