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Optics Communications

All-optical regenerative memory with full write/read capability

Alistair J. Poustie, Anthony E. Kelly, Robert J. Manning, Keith J. Blow

Published Sep 1, 1998• 29 citations
Publisher
DOI
10.1016/s0030-4018(98)00331-9

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arXiv:2011.00811•npj Quantum Information•Oct 15, 2020•22 citations
The function of ‘memory’ is one of the key building blocks to implement advanced information processing in future ultrahigh-speed photonic networks. Previously, we have described an all-optical regenerative memory in which stable storage of data is obtained for several hours [1]. In addition, the memory architecture provides amplitude restoration for the stored pulses and the ability to set a threshold storage level [2]. Here we demonstrate an important extension to this design which not only allows optical pulses to be written to the memory but also permits optical pulses to be selectively read from storage. This additional capability greatly extends the usefulness of the memory as a sub-system in more complex processing operations [3]. To achieve the ‘read’ function we incorporate a third nonlinear optical switching element (TOAD/SLALOM [4,5]) to act as an all-optical modulator for the data stored in the regenerative memory.
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.
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. Toward 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 that 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 1 ms. With these features, the node constitutes a promising building block for a quantum repeater and ultimately a quantum internet.