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Researchers Provide Route To Scalable Quantum Photonics

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Picture: 2D monolayer on a SiN waveguide.

Researchers from the Photonics Research Group, an imec
research group at Ghent university and MIT have announced that they have
integrated single photon emitters in 2D layered materials with a Silicon
Nitride photonic chip. Even for moderate quantum yields, dielectric cavities
could be designed such that the single photon extraction into the guided mode
can reach unity. The results, published in Nature Communications, provide a
crucial step in fundamental quantum photonics and 2D materials research.

Photonic integrated circuits (PICs) enable the
miniaturization of complex quantum optical circuits connecting large numbers of
photonic devices with optimized insertion losses and phase stability. A central
building block for such an integrated quantum circuit is a single photon
emitter (SPE), and a variety of material systems have been investigated to
create such on-chip SPEs. 2D-based SPEs have some unique properties that make
them particularly appealing for integration with PICs. First, they can be
easily interfaced with PICs and stacked together to create complex
heterostructures. Second, due to their thinness, and the absence of total
internal reflection, they enable very high light extraction efficiencies
without the need of any additional processing, allowing efficient single photon
transfer between the host and the underlying PIC. Third, 2D materials grown
with high wafer-scale uniformity are becoming more readily available.

Through nanoscale strain engineering, the team coupled
2D-based SPEs with a CMOS-compatible Silicon Nitride waveguide. Moreover, they
extracted crucial performance parameters for this source and used them in an
optimization analysis to maximize single photon extraction and
indistinguishability into the guided mode. It was found that even for moderate
quantum yields, dielectric cavities could be designed such that the single
photon extraction into the guided mode can reach unity.

“These results provide a crucial step in scaling up quantum
photonic devices using 2D-based integrated single photon sources,” stated
Frédéric Peyskens, first author of the paper.







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