Efficient spin-photon interfaces for quantum repeater and quantum network applications

Efficient spin-photon interfaces are essential for applications like quantum repeaters and quantum networks. We employ quantum interference of indistinguishable single photons as a resource for entanglement generation between remote spin systems. Color center in diamond offer unique capabilities including long-lived, spin-based memory registers and spin-photon interfaces. In an all-diamond approach we utilize macroscopic solid immersion lenses or all-diamond resonators to boost the efficiency realizing scalable platforms with high photon generation rates. Alternatively, we employ optical Fabry-Perot resonators for Purcell- enhanced photon emission offering high connectivity to existing fiber networks.

Selected references:

S. Häußler, et al., „Tunable quantum photonics platform based on fiber-cavity enhanced single photon emission from two-dimensional hBN“. arXiv:2006.13048 (2020)

S. Häußler et al., Diamond-Photonics Platform Based on Silicon-Vacancy Centers in a Single Crystal Diamond Membrane and a Fiber Cavity. Physical Review B 99, 165310 (2019)

B. J. M. Hausmann, et al., Integrated Diamond Networks for Quantum Nanophotonics. Nano Letters 12, 3, 1578-1582 (2012)

A. Sipahigil, et al., „Quantum interference of single photons from remote nitrogen-vacancy centers in diamond. Physical Review Letters 108, 143601 (2012)