Experimental realization of a multiplexed quantum memory with 225 individually accessible memory cells

TL;DR

This paper reports the experimental realization of a multiplexed quantum memory with 225 individually accessible cells, enabling advanced quantum communication and networking capabilities.

Contribution

It demonstrates a scalable, addressable quantum memory with high fidelity, advancing practical quantum repeater technologies.

Findings

Successfully stored and retrieved entanglement in any of the 225 cells

High-fidelity readout of stored quantum states

Programmable control over memory cell addressing and readout

Abstract

To realize long-distance quantum communication and quantum network, it is required to have multiplexed quantum memory with many memory cells. Each memory cell needs to be individually addressable and independently accessible. Here we report an experiment that realizes a multiplexed DLCZ-type quantum memory with 225 individually accessible memory cells in a macroscopic atomic ensemble. As a key element for quantum repeaters, we demonstrate that entanglement with flying optical qubits can be stored into any neighboring memory cells and read out after a programmable time with high fidelity. Experimental realization of a multiplexed quantum memory with many individually accessible memory cells and programmable control of its addressing and readout makes an important step for its application in quantum information technology.