# Experimental realization of 105-qubit random access quantum memory

## TL;DR

This paper reports the experimental creation of a 105-qubit random access quantum memory using a macroscopic atomic ensemble, enabling programmable storage and retrieval of quantum information with high fidelity.

## Contribution

It demonstrates the first realization of a large-scale, programmable quantum memory with 105 qubits, advancing quantum communication and computing capabilities.

## Key findings

- Successfully stored and retrieved optical qubits with fidelity exceeding classical bounds.
- Achieved programmable access to 210 memory cells within the quantum memory.
- Paved the way for scalable quantum networks and computation.

## Abstract

Random access memory is an indispensable device for classical information technology. Analog to this, for quantum information technology, it is desirable to have a random access quantum memory with many memory cells and programmable access to each cell. We report an experiment that realizes a random access quantum memory of 105 qubits carried by 210 memory cells in a macroscopic atomic ensemble. We demonstrate storage of optical qubits into these memory cells and their read-out at programmable times by arbitrary orders with fidelities exceeding any classical bound. Experimental realization of a random access quantum memory with many memory cells and programmable control of its write-in and read-out makes an important step for its application in quantum communication, networking, and computation.