On-chip single photon filtering and multiplexing in hybrid quantum photonic circuits

Ali W. Elshaari (), Iman Esmaeil Zadeh, Andreas Fognini, Michael E. Reimer, Dan Dalacu, Philip J. Poole, Val Zwiller and Klaus D. Jöns
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Ali W. Elshaari: Royal Institute of Technology (KTH)
Iman Esmaeil Zadeh: Delft University of Technology
Andreas Fognini: Delft University of Technology
Michael E. Reimer: University of Waterloo
Dan Dalacu: National Research Council of Canada
Philip J. Poole: National Research Council of Canada
Val Zwiller: Royal Institute of Technology (KTH)
Klaus D. Jöns: Royal Institute of Technology (KTH)

Nature Communications, 2017, vol. 8, issue 1, 1-8

Abstract: Abstract Quantum light plays a pivotal role in modern science and future photonic applications. Since the advent of integrated quantum nanophotonics different material platforms based on III–V nanostructures-, colour centers-, and nonlinear waveguides as on-chip light sources have been investigated. Each platform has unique advantages and limitations; however, all implementations face major challenges with filtering of individual quantum states, scalable integration, deterministic multiplexing of selected quantum emitters, and on-chip excitation suppression. Here we overcome all of these challenges with a hybrid and scalable approach, where single III–V quantum emitters are positioned and deterministically integrated in a complementary metal–oxide–semiconductor-compatible photonic circuit. We demonstrate reconfigurable on-chip single-photon filtering and wavelength division multiplexing with a foot print one million times smaller than similar table-top approaches, while offering excitation suppression of more than 95 dB and efficient routing of single photons over a bandwidth of 40 nm. Our work marks an important step to harvest quantum optical technologies’ full potential.

Date: 2017
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DOI: 10.1038/s41467-017-00486-8

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