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Future quantum repeater architectures, capable of efficiently distributinginformation encoded in quantum states of light over large distances, willbenefit from multiplexed photonic quantum memories. In this work we demonstratea temporally multiplexed quantum repeater node in a laser-cooled cloud of$^{87}$Rb atoms. We employ the DLCZ protocol where pairs of photons and singlecollective spin excitations (so called spin waves) are created in severaltemporal modes using a train of write pulses. To make the spin waves created indifferent temporal modes distinguishable and enable selective readout, wecontrol the dephasing and rephasing of the spin waves by a magnetic fieldgradient, which induces a controlled reversible inhomogeneous broadening of theinvolved atomic hyperfine levels. We demonstrate that by embedding the atomicensemble inside a low finesse optical cavity, the additional noise generated inmulti-mode operation is strongly suppressed. By employing feed forward readout,we demonstrate distinguishable retrieval of up to 10 temporal modes. For eachmode, we prove non-classical correlations between the first and second photon.Furthermore, an enhancement in rates of correlated photon pairs is observed aswe increase the number of temporal modes stored in the memory. The reportedcapability is a key element of a quantum repeater architecture based onmultiplexed quantum memories.

A cold atom temporally multiplexed quantum memory with cavity-enhanced noise suppression