Multisource on-chip quantum photonics with tunable QDs

The ambitious goal of this project is to implement a scalable architecture for integrated quantum photonics with quantum emitters monolithically embedded in photonic circuits. To demonstrate its capabilities, our main target is to achieve near-unity two-photon HOM interference between photons emitted by different QDs in the same chip, as this is a key element for any complex quantum optics operations. While HOM interference with near-unity visibility has been achieved for photons generated by one source, reaching it with photons stemming from distinct sources is much more challenging, and it has so far been experimentally demonstrated only with GaAs QDs embedded into separate diode structures [Zh:2022]. By profiting of progress achieved within our former project as well as in the international community, we are now in the position to transfer these results (and perhaps outperform them) to on-chip devices by addressing the following critical questions:
- How can we achieve high photon coupling efficiency into single mode waveguides and build up photonic circuits featuring high mechanical stability, good tolerances to fabrication imperfections, and low propagation losses?
- How can we consistently achieve blinking-free and Fourier limited emission into the desired optical modes for different QDs on a single chip?
- How can we ensure high indistinguishability among photons emitted by different quantum emitters on the same chip and – later on – on different chips?