A quantum network consists of a set of quantum processing and storage nodes distributed at different locations and connected by optical fibers that transmit quantum information with photons. There are several candidates for the implementation of the nodes, perhaps the most promising is the one which is based on superconducting electronic circuits. This platform operates in the microwave regime, and quantum-coherent microwave-to-optical converters will play the key role for the realization of a quantum network with the superconducting circuit nodes. Stimulated Raman scattering of atoms with Λ-configuration of levels is a promising tool for transducing microwave photons to optical photons. We consider [1] an atomic Bose-Einstein condensate whose large phase-space density highly amplifies the coupling to the microwave field. We determine the optimal conditions for the emitted optical photons to be collected into the guided modes of optical fibers.

 

 

[1]: Árpád Kurkó, Péter Domokos, David Petrosyan, András Vukics: arXiv:2108.13719 [quant-ph]