A Novel Setup for Coupling Diamond Color Centers to Open Fiber-based Microcavities
Y. Herrmann1,2 J. Fischer1,2 L. Feije1,2 J. Brevoord1,2 M. Weaver1,2 M. Ruf1,2 M. Pasini1,2 R. Hanson1,2
1 QuTech, Delft University of Technology, 2628 CJ Delft, The Netherlands
2 Kavli Institute of Nanoscience, Delft University of Technology, 2628 CJ Delft, The Netherlands
Quantum networks [1,2] are promising both for applications like secure communication and for basic science tests of quantum mechanics at a large scale. The Nitrogen-Vacancy (NV) center in diamond is an excellent node candidate, because of a long spin coherence and accessible local qubit registers, but it has limited collectable coherent photon emission. Integration into an optical cavity can boost collection via the Purcell effect [3,4], but the sensitivity of open cavities to vibrations from the environment has so far been a major roadblock for developing the system further into a quantum network node, capable of entanglement generation [5]. Here we present a new low temperature setup, which provides a low vibration level while maintaining flexibility over the cavity and fiber control. Such a system may speed up entanglement rates in present day networks by at least a factor of 100, a critical step towards large scale quantum networks with NV centers.
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[3] E. Janitz et al., Optica 7, 1232-1252 (2020)
[4] D. Riedel et al., Phys. Rev. X 7, 031040 (2017)
[5] M. Ruf et al., Phys. Rev. Applied 15, 024049 (2021)