Work

Integrated spectrally multiplexed light–matter interface at telecom band

Year: 2024

Type: article

Abstract: The light–matter interface is an important building block for long-distance quantum networks. Towards a scalable quantum network with high-rate quantum information processing, it requires to develop integrated light–matter interfaces with broadband and multiplexing capacities. Here we demonstrate a light–matter interface at the telecom band in an integrated system. A five-spectral-channel atomic-frequency-comb photonic memory is prepared on a laser-written Er3+:LiNbO3 chip. The bandwidth of each channel is 4 GHz with a channel spacing of 15 GHz. The signal photons from time-bin entangled photon pairs at the telecom band are sent into the on-chip memory and recalled after a storage time of 152 ns. The entanglement-preserving nature of our integrated quantum interface is assessed by an input/output fidelity of >92% for all five spectral channels. Our light–matter interfaces constitute a notable step forward toward a high-rate quantum network involving integrated devices.

Source: Photonics Research

DOI: 10.1364/prj.537109