![]() In particular, the latter system operates in the lowest-loss telecom C-band centered at 1550 nm, promising a clear advantage for long-distance quantum communication applications 2. Recently, spin-control has been demonstrated at 1220 nm wavelength in nitrogen-vacancy centers in SiC 24, at 1330 nm using ensemble of radiation T-damage centers in 28Si 25, and at 1550 nm in E r 3+ in Y 2SiO 5 21, 22. Such systems might in principle achieve over seconds spin-coherence times 23, but require the usage of high-finesse cavities to enhance the intrinsically slow emission rates.Īmong those many types of solid-state platforms, only a few systems demonstrated capability of directly interfacing spins with telecom-wavelength photons. Another promising class of spin-active emitters are rare-earth-ion doped crystals embedded in cavities 20, 21, 22. While diamond is still a rather challenging material for micro-processing, platforms based on defects in SiC show similar optical-performance with milliseconds spin-coherence times 18, 19, and stand out by maturity of SiC and processing methods. Another well-established spin-system, vacancy centers in diamond, while suffering intrinsically low emission efficiency into the zero-phonon-line, show very long coherence times on the level of single seconds 16, and allowed for demonstration of spin–spin entanglement on the record distance of 1.3 km 17. Semiconductor quantum dots (QDs) for instance, show excellent optical properties 9, 10, achieve spin-coherence times on the level of tens of microseconds 11, 12, and allow for efficient generation of spin–photon 4, 5, 6, 13 and spin–spin 14, 15 entanglement. Each platform varies in the terms of electronic structure, emission wavelength, optical performance, spin-coherence, and integration capabilities with photonic devices 7, 8. Spin-based photonics have been to date realized using a wide range of material systems. In this regard, spin degrees of freedom in solid-state quantum emitters are of particular interest due to the potential of realizing quantum entanglement between a confined spin and a propagating photon 3, 4, 5, 6. Long-distance quantum network technologies require reliable interfaces between stationary qubits and photons with frequencies in the telecom bands 1, 2.
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