Independent Operation of Two Waveguide-Integrated Quantum Emitters

Scaling up single-photon sources directly on a chip is fundamental requirement for realizing quantum information protocols that demand scalable, integrated photonic qubits. Integrating multiple emitters in circuit has encountered major roadblocks wavelength disparity and the lack of compact excitation method. The authors demonstrate simultaneous two dots same independent control emitters' wavelengths, enabling two-photon interference. Spectral diffusion not as detrimental to interference process anticipated. These results address longstanding challenge photonics.