A network-ready random-access qubits memory

Abstract

Photonic qubits memories are essential ingredients of numerous quantum networking protocols. The ideal situation features quantum computing nodes that are efficiently connected to quantum communication channels via quantum interfaces. The nodes contain a set of long-lived matter qubits, the channels support the propagation of light qubits, and the interface couples light and matter qubits. Towards this vision, we here demonstrate a random-access multi-qubit write-read memory for photons using two rubidium atoms coupled to the same mode of an optical cavity, a setup which is known to feature quantum computing capabilities. We test the memory with more than ten independent photonic qubits, observe no noticeable cross talk, and find no need for re-initialization even after ten write-read attempts. The combined write-read efficiency is 26% and the coherence time approaches 1ms. With these features, the node constitutes a promising building block for a quantum repeater and ultimately a quantum internet.

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• A Quantum-Logic Gate between Distant Quantum-Network Modules
• Mid-circuit cavity measurement in a neutral atom array
• Cavity-enhanced quantum network nodes
• A Quantum Repeater Node Demonstrating Unconditionally Secure Key Distribution
• Resilience of quantum random access memory to generic noise
• Fusion of deterministically generated photonic graph states
• Quantifying Quantumness of Channels Without Entanglement
• Data centers with quantum random access memory and quantum networks
• Multicell Atomic Quantum Memory as a Hardware-Efficient Quantum Repeater Node
• Realization of a programmable multi-purpose photonic quantum memory with over-thousand qubit manipulations
• Multiplexed random-access optical memory in warm cesium vapor
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• Quantum Storage of Qubits in an Array of Independently Controllable Solid-State Quantum Memories
• Hidden nonmacrorealism: reviving the Leggett-Garg inequality with stochastic operations