CE47 - Technologies quantiques

Waveguide architecture for integrated quantum memories – WAQUAM

Submission summary

In WAQUAM, a new generation of photonic quantum memory architecture will be developed, in order to allow for high performance on-demand storage of quantum information. Such devices are of central importance for the development of quantum networks, in which quantum information is generated, manipulated, stored, transmitted and detected. In these networks, synchronization capability is crucial for high-rate information exchange.
The device will be designed as a ridge waveguide, shaped within a rare-earth ion-doped crystal: praseodymium-doped yttrium orthosilicate. By combining unprecedented coherence properties of rare-earths with a non-invasive waveguide fabrication technique, similar performances compared to state-of-the-art bulk implementation will be witnessed for the first time. Moreover, the hybrid design will enable for the first time the integration of multiple active functions on the same device, by allowing photonic routing in the silica substrate. Heterogeneous bonding techniques combined with mechanical dicing will permit the fabrication of the waveguides, which will demonstrate state-of-the-art optical performances.
On-demand storage of photonic quantum superposition at the single photon level will then be demonstrated in the on-site fabricated devices thanks to the atomic frequency comb protocol, qualifying them as a full-fledged photonic platform for quantum technologies. Local expertise at INPHYNI regarding waveguide fabrication and characterization both in the classical and quantum regimes will give the project a solid environment towards its success.

Project coordination

Jean Etesse (Institut de Physique de Nice)

The author of this summary is the project coordinator, who is responsible for the content of this summary. The ANR declines any responsibility as for its contents.


INPHYNI Institut de Physique de Nice

Help of the ANR 355,792 euros
Beginning and duration of the scientific project: January 2022 - 48 Months

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