Reconfigurable photonics with on-chip single-photon detectors

Samuel Gyger (), Julien Zichi, Lucas Schweickert, Ali W. Elshaari, Stephan Steinhauer, Saimon F. Covre da Silva, Armando Rastelli, Val Zwiller, Klaus D. Jöns and Carlos Errando-Herranz ()
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Samuel Gyger: KTH Royal Institute of Technology
Julien Zichi: KTH Royal Institute of Technology
Lucas Schweickert: KTH Royal Institute of Technology
Ali W. Elshaari: KTH Royal Institute of Technology
Stephan Steinhauer: KTH Royal Institute of Technology
Saimon F. Covre da Silva: Institute of Semiconductor and Solid State Physics, Johannes Kepler University Linz
Armando Rastelli: Institute of Semiconductor and Solid State Physics, Johannes Kepler University Linz
Val Zwiller: KTH Royal Institute of Technology
Klaus D. Jöns: KTH Royal Institute of Technology
Carlos Errando-Herranz: KTH Royal Institute of Technology

Nature Communications, 2021, vol. 12, issue 1, 1-8

Abstract: Abstract Integrated quantum photonics offers a promising path to scale up quantum optics experiments by miniaturizing and stabilizing complex laboratory setups. Central elements of quantum integrated photonics are quantum emitters, memories, detectors, and reconfigurable photonic circuits. In particular, integrated detectors not only offer optical readout but, when interfaced with reconfigurable circuits, allow feedback and adaptive control, crucial for deterministic quantum teleportation, training of neural networks, and stabilization of complex circuits. However, the heat generated by thermally reconfigurable photonics is incompatible with heat-sensitive superconducting single-photon detectors, and thus their on-chip co-integration remains elusive. Here we show low-power microelectromechanical reconfiguration of integrated photonic circuits interfaced with superconducting single-photon detectors on the same chip. We demonstrate three key functionalities for photonic quantum technologies: 28 dB high-extinction routing of classical and quantum light, 90 dB high-dynamic range single-photon detection, and stabilization of optical excitation over 12 dB power variation. Our platform enables heat-load free reconfigurable linear optics and adaptive control, critical for quantum state preparation and quantum logic in large-scale quantum photonics applications.

Date: 2021
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DOI: 10.1038/s41467-021-21624-3

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