Low-loss all-optical ns-switching for single-photon routing in scalable integrated quantum photonics

Fabian Ruf*, Lars Nielsen, Mircea Balauroiu, Nicolas Volet, Martijn Heck

*Corresponding author af dette arbejde

Publikation: Bidrag til bog/antologi/rapport/proceedingKonferencebidrag i proceedingsForskning


Efficient single-photon routing and switching are crucial for optical quantum computing and communication. For this purpose, all-optical switches are designed for gigahertz bandwidths. The switching mechanism is based on the optical Kerr effect via cross-phase modulation (CPM) of the single-photon signal by a strong 1550-nm pump pulse. For energy-efficient switching, this nonlinear effect is exploited in a microresonator that can either be used directly as an intensity switch in a typical add–drop configuration or as a phase shifter in a Mach–Zehnder interferometer (MZI) structure. To speed up resonance build-up and quenching, a pre-emphasis build and an off-resonance wipe pulse are used. The proposed designs are verified by traveling-wave simulations which demonstrate that 0.1 dB insertion loss and ~1 ns switching windows can be achieved. For a scalable out-of-the-lab transfer, we investigate the feasibility of the proposed switch designs for fabrication in a mature photonic integrated circuit (PIC) platform. In particular, silicon nitride PICs have demonstrated record-low losses which makes them suitable for single-photon applications. By parametric modelling of the microresonator’s directional couplers based on Lumerical EME and 2.5-dimensional varFDTD simulations, the required power transmission coefficients for both signal and pump wavelength can be achieved. This results in an all-optical switch design ready for fabrication in a commercial PIC foundry which can potentially enable scalable architectures for quantum photonic applications.
TitelIntegrated Photonics Platforms II
Redaktører Roel G. Baets, Peter O'Brien, Laurent Vivien
Udgivelsessted Bellingham
ForlagSPIE - International Society for Optical Engineering
Publikationsdatomaj 2022
ISBN (Trykt) 9781510651722
ISBN (Elektronisk)9781510651722
StatusUdgivet - maj 2022
BegivenhedSPIE Photonics Europe - Strasbourg, Frankrig
Varighed: 3 apr. 20217 apr. 2022


KonferenceSPIE Photonics Europe
NavnProceedings of SPIE, the International Society for Optical Engineering


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