Quantum Communication between Multiplexed Atomic Quantum Memories

TL;DR

This paper demonstrates the integration of generation, storage, and transmission of quantum entanglement in multiplexed atomic quantum memories, showing compatibility and quantum information preservation, advancing quantum network capabilities.

Contribution

It presents the first experimental demonstration of compatible quantum operations in a multiplexed atomic quantum memory system, supporting higher-dimensional quantum states.

Findings

Successful generation of photon-atom entanglement in a 6x5 MAQM

Quantum state fidelity verified after storage and retrieval

Supports higher-dimensional quantum systems beyond qubits

Abstract

The use of multiplexed atomic quantum memories (MAQM) can significantly enhance the efficiency to establish entanglement in a quantum network. In the previous experiments, individual elements of a quantum network, such as the generation, storage and transmission of quantum entanglement have been demonstrated separately. Here we report an experiment to show the compatibility of these basic operations. Specifically, we generate photon-atom entanglement in a $6\times 5$ MAQM, convert the spin wave to time-bin photonic excitation after a controllable storage time, and then store and retrieve the photon in a second MAQM for another controllable storage time. The preservation of quantum information in this process is verified by measuring the state fidelity. We also show that our scheme supports quantum systems with higher dimension than a qubit.