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Quantum Dot Single Photon Emitters 2026 — PatSnap Eureka

Quantum Dot Single Photon Emitters 2026 — PatSnap Eureka
Technology Landscape 2026

Quantum Dot Single Photon Emitters: The 2026 Innovation Landscape

From self-assembled InAs/GaAs dots to room-temperature perovskite emitters, explore the material systems, photonic integration strategies, and geographic IP concentrations shaping quantum communication and QKD in 2026 — powered by PatSnap Eureka.

Dataset Results by Innovation Phase
QD SPE Publication Activity by Phase: Foundational 2006–2013 ~8 results, Development 2014–2019 ~12 results, Maturation 2020–2023 18+ results Bar chart showing the accelerating pace of quantum dot single photon emitter research across three innovation phases derived from PatSnap Eureka dataset analysis. The maturation phase (2020–2023) shows the highest activity with at least 18 results, signaling rapid acceleration toward manufacturable and silicon-integrated QD SPEs. 20 15 10 5 ~8 2006–2013 Foundational ~12 2014–2019 Development 18+ 2020–2023 Maturation
Source: PatSnap Eureka · QD SPE dataset snapshot
g²(0) <0.05
Leading photon purity demonstrations
48%
Collection efficiency, NIST circular Bragg grating
18+
Results in 2020–2023 maturation phase
300 K
Room-temp operation achieved by perovskite QDs (Sogang, 2023)
Technology Overview

What Are Quantum Dot Single Photon Emitters?

Quantum dot single photon emitters are semiconductor nanostructures engineered to emit exactly one photon on demand, making them foundational components for quantum communication, quantum key distribution (QKD), quantum computing, and quantum sensing. They exploit three-dimensional quantum confinement to produce sub-Poissonian photon statistics, verified by second-order correlation function measurements showing g²(0) < 0.5 — and in leading demonstrations, g²(0) < 0.05.

The field has matured from early proof-of-concept demonstrations using self-assembled InAs dots into a multidisciplinary landscape spanning epitaxial III-V and II-VI heterostructures, colloidal nanocrystals, perovskite QDs, and hybrid photonic integration architectures. A central theme is the tension between photon purity, brightness (photon extraction efficiency), indistinguishability (Hong-Ou-Mandel interference visibility), and operating temperature.

Microcavity engineering — photonic crystal waveguides, circular Bragg gratings, distributed Bragg reflectors (DBRs), micropillars, and plasmonic structures — is the dominant approach to resolving these trade-offs. PatSnap's IP analytics platform reveals that innovation is distributed across many academic institutions rather than concentrated in commercial entities, with Toshiba Research Europe being the most prominent industry-linked assignee with foundational patents.

The dataset spans publications from 2006 to 2023 and reveals a clear three-phase trajectory: a foundational phase of proof-of-concept demonstrations, a development phase focused on telecom wavelength engineering and photonic integration, and a maturation phase emphasising wafer-scale manufacturing and silicon integration.

Key Material Platforms
III-V Epitaxial
InAs/GaAs, InAs/InP — telecom O-band & C-band (1.3–1.55 µm)
III-Nitride
InGaN/GaN, GaN/AlN — room temperature, UV-visible range
II-VI QDs
CdTe/ZnTe, CdSe/ZnSe — visible range, Ioffe Institute
Perovskite
CsPbI₃, PbS — emerging room-temperature options
Competing Platforms
  • NV centers in diamond
  • G-centers in silicon
  • Graphene quantum dots
Four Key Technology Clusters

Dominant Innovation Clusters in the QD SPE Landscape

The retrieved dataset organises into four primary technology clusters, each targeting distinct trade-offs between photon purity, operating temperature, and photonic integration.

Cluster 1 · Most Advanced

Epitaxial III-V QDs in Photonic Cavity Structures

The dominant cluster in the dataset, spanning at least 20 retrieved results. Self-assembled InAs QDs grown by MBE on GaAs or InP substrates are embedded in engineered optical cavities — photonic crystal waveguides, circular Bragg gratings, micropillars, and DBR structures — to boost Purcell factors, extraction efficiency, and photon indistinguishability. Technische Universität Berlin (2020) achieved pure single-photon emission compatible with Stirling cryocoolers up to 40 K using in-situ EBL and thermocompression gold mirrors. Wrocław University of Science and Technology demonstrated photon generation rates exceeding 0.5 GHz with zero multi-photon coincidences at zero time delay.

g²(0) = 0.03 ± 0.02 achieved (TU Berlin, 2019)
Cluster 2 · Room-Temperature Target

Room-Temperature and Elevated-Temperature QD Emitters

A critical barrier for practical deployment is the requirement for cryogenic cooling (typically 4–40 K) in III-V InAs/GaAs systems. III-nitride QDs (InGaN/GaN, GaN/AlN) and perovskite QDs are pursued as room-temperature alternatives, leveraging large exciton binding energies and tunable confinement. University of Strathclyde (2021) achieved raw g²(0) = 0.043 ± 0.009 from InGaN/GaN under pulsed quasi-resonant excitation — sufficient purity for QKD. Sogang University (2023) demonstrated CsPbI₃ perovskite QD emission narrowed to ~1 nm with 5 MHz single-photon rate at 300 K.

EPFL: g²(0) = 0.17 at 300 K on silicon
Cluster 3 · Scalability Frontier

Silicon-Integrated and Heterogeneous Photonic Platforms

Scalability demands integration of QD SPEs with CMOS-compatible silicon photonics. This cluster covers transfer printing, heterogeneous bonding, colloidal QD waveguide integration, and native silicon emitters. University of Tokyo (2019) achieved a key milestone by transfer-printing InAs/GaAs QDs onto CMOS Si PICs. DTU (2022) demonstrated InAs/InP QDs heterogeneously integrated on Si with ~10% photon extraction efficiency using an industry-compatible process. University of Münster (2022) reported near-unity integration yield positioning individual colloidal core-shell QDs in nanophotonic networks.

DTU: ~10% extraction efficiency on Si (2022)
Cluster 4 · Precision Engineering

Nanowire, Nanoantenna, and Deterministic Positioning

Nanowire geometries and dielectric/plasmonic nanoantennas provide high Purcell factors through mode engineering. Deterministic positioning — in-situ EBL, AFM placement, droplet epitaxy — overcomes the random spatial distribution of self-assembled QDs. National Research Council Canada (2023) demonstrated InAsP quantum dot-in-a-rod in an InP nanowire achieving 27.6% collection efficiency and g²(0) = 0.021 at saturation. Universität Würzburg (2015) achieved ~173,000 detected photons/second via gold-disk Tamm-plasmon coupling. Iran University of Science and Technology (2022) demonstrated a Purcell factor of 5.45 using FDTD-optimised hexagonal InP nanowire.

NRC Canada: 27.6% collection efficiency (2023)
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Data Insights

Key Metrics Across the QD SPE Landscape

Visualising photon extraction efficiency benchmarks and geographic research concentration from the PatSnap Eureka dataset.

Photon Extraction Efficiency by Architecture

Comparison of reported collection/extraction efficiencies across leading photonic cavity architectures for QD SPEs, showing NIST's circular Bragg grating leading at 48%.

Photon Extraction Efficiency by Architecture: NIST Circular Bragg Grating 48%, Toshiba PCW 24%, NRC Canada Nanowire 27.6%, DTU Si-Integrated 10%, Würzburg Tamm-Plasmon 7% Bar chart comparing photon extraction and collection efficiency across five quantum dot single photon emitter photonic cavity architectures, derived from patent and literature analysis via PatSnap Eureka. NIST's circular Bragg grating device leads with 48% collection efficiency, followed by NRC Canada's InAsP nanowire at 27.6%. 50% 40% 30% 20% 10% 48% NIST CBG 27.6% NRC Nanowire 24% Toshiba PCW ~10% DTU Si-Integrated 7% Würzburg Tamm-Plasmon

Geographic Distribution of Research Results

Europe dominates the dataset with 18–20 results, reflecting leadership from Germany, Poland, Denmark, France, and the UK.

Geographic Distribution of QD SPE Research Results: Europe 18–20 results (~55%), East Asia 6–8 results (~20%), North America 5–6 results (~17%), Russia 3 results (~8%) Donut chart showing geographic concentration of quantum dot single photon emitter research results in the PatSnap Eureka dataset. Europe is the most prolific region with approximately 18–20 results, representing roughly 55% of the dataset, with Germany, Poland, Denmark, France, and the UK as key contributors. ~38 total results Europe (~55%) East Asia (~20%) N. America (~17%) Russia (~8%) Source: PatSnap Eureka QD SPE dataset snapshot

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Application Domains

Where Quantum Dot SPEs Are Being Deployed

The dataset identifies four primary application domains, with quantum communication and QKD representing the largest and most clearly defined commercial target.

Largest Application Domain

Quantum Communication & QKD

The largest and most clearly defined application domain in the dataset. Telecom O-band (1.3 µm) and C-band (1.55 µm) compatibility is the central engineering target, directly driven by fiber-optic infrastructure requirements. CNR-IMEM Institute (2020) performed numerical benchmarking of InAs/InP, InAs/InGaAs metamorphic, InAs/GaSb/Si, and InAsN/GaAs systems for C-band emission. Universidad Industrial de Santander (2019) demonstrated PbS colloidal QDs with plasmonic enhancement at λ = 1550 nm for fiber communication.

1.3 µm & 1.55 µm telecom compatibility critical
Photonic Integration

Quantum Computing & Photonic Integrated Circuits

On-chip integration with waveguides, beam splitters, and detectors is essential for photonic quantum computing. CNRS University Paris Saclay (2021) reports a ten-fold efficiency increase using QDs in optical microcavities, directly targeting quantum computing and quantum networks. The Institute of Ion Beam Physics and Materials Research (2020) demonstrated G-center silicon emitters in SOI wafers approaching 10⁵ counts/second, envisioning integrated QD sources, waveguides, and detectors on a single SOI chip. PatSnap's life sciences intelligence tools track adjacent photonics IP relevant to quantum biosensing.

10× efficiency gain via optical microcavities (CNRS)
🔒
Unlock Quantum Metrology & Free-Space Application Data
See how PTB, Ioffe Institute, and KAIST are targeting radiometry calibration and atmospheric free-space QKD links.
PTB radiometry Ioffe free-space KAIST nano-obelisk + more
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2021–2023 Dataset Signals

Six Emerging Directions Shaping the Next Phase

Based on the most recent filings and publications in the dataset, these six directions are identifiable as the frontier of QD SPE innovation.

🏭

Wafer-Scale Manufacturable Fabrication

Sun Yat-sen University (2021) achieved uniform low-density QDs (0.96/µm²) across 3-inch wafers with g²(0) = 0.032, signaling manufacturing readiness for InAs/GaAs QD SPEs beyond laboratory demonstrations.

🌡️

Elevated-Temperature Operation Toward 300 K

NRC Canada (2023) evaluated performance up to 300 K in nanowire QD devices. Sogang University (2023) achieved room-temperature ultranarrow (~1 nm) single-mode emission from CsPbI₃ perovskite QDs at 5 MHz single-photon rate.

🔬

Colloidal QD Integration into Nanophotonic Circuits

University of Münster (2022) reports near-unity yield positioning of individual colloidal QDs into photonic chip waveguides using iterative EBL — a scalability breakthrough for solution-processable emitters.

Heterogeneous Integration with Silicon Photonics

DTU (2022) demonstrated an industry-compatible vertical emitting device with InAs/InP QDs on Si substrates, opening a path to co-integration with CMOS photonics foundries and scalable quantum PIC manufacturing.

🔒
Unlock 3D Micro-Optics & Frequency Conversion Insights
Access details on alignment-free fiber coupling and >30% quantum frequency conversion efficiency for telecom compatibility.
3D printed lenses on QDs 711 nm → 1313 nm conversion + more
Explore Emerging Directions →
Geographic & Assignee Landscape

Where Is QD SPE Innovation Concentrated?

Among all retrieved results with identifiable institutional affiliations, Europe is the most prolific region with approximately 18–20 results. Germany leads within Europe with Technische Universität Berlin (3 results), consistently focused on deterministic fabrication and telecom QDs, alongside Universität Würzburg, Universität Stuttgart, and Universitaet des Saarlandes. Poland represents a notable concentration with Wrocław University of Science and Technology (4 results) focused on InAs/InP telecom-band QD spectroscopy.

East Asia contributes approximately 6–8 results, with China (Sun Yat-sen University, Beihang University, Chinese Academy of Sciences), Japan (University of Tokyo, Hokkaido University, NIMS), and South Korea (KAIST) all represented. North America contributes approximately 5–6 results, led by NIST (circular Bragg grating SPEs, 48% efficiency) and National Research Council Canada (2023, InAsP nanowire QDs at 1.31 µm).

The dataset reveals that the core QD SPE IP base is heavily concentrated in European and East Asian universities with limited commercial assignee filings. This creates both licensing opportunity and freedom-to-operate risk for companies seeking to commercialize, as fundamental photonic cavity and deterministic-positioning patents may be broadly held by public research institutions. PatSnap customers use Eureka to map these institutional IP positions before entering new technology domains.

Top Institutions by Result Count
Wrocław Univ. of Science & Technology
Poland · InAs/InP telecom spectroscopy
~4
Technische Universität Berlin
Germany · deterministic fabrication
~3
Ioffe Institute
Russia · II-VI visible-range SPEs
~3
Toshiba Research Europe
UK · foundational industry patents
~2
NIST
USA · 48% efficiency CBG devices
~2
IP Strategy Signal

Innovation is distributed across many academic institutions rather than concentrated in commercial entities. Toshiba Research Europe is the most prominent industry-linked assignee with foundational patents.

Strategic Implications

Key Strategic Signals for R&D and IP Teams

Four strategic implications derived from the dataset for teams building or investing in quantum dot single photon emitter technology.

Strategic Theme Evidence from Dataset Recommended Action Priority
Telecom-Band Alignment
The defining commercial threshold
Overwhelming emphasis on 1.3 µm and 1.55 µm emission across retrieved results reflects market pull from fiber-optic quantum network infrastructure Prioritise InAs/InP and InAs/InGaAs metamorphic systems for near-term deployment; track perovskite QD room-temperature alternatives for longer-term disruption High
Silicon Integration
Scalability bottleneck & primary opportunity
Multiple 2021–2023 results from DTU, University of Tokyo, and NRC Canada converging on heterogeneous and transfer-printed integration with Si Monitor and potentially pursue IP filings in transfer printing and heterogeneous bonding — the next competitive frontier is a CMOS-foundry-compatible QD SPE process High
Deterministic Fabrication
Academic to manufacturing transition
In-situ EBL (TU Berlin, Wrocław), droplet epitaxy, and SESRE are eliminating the random QD placement problem Assess freedom-to-operate around positioning methods; TU Berlin and NIST hold key positions in deterministic placement IP Medium
Room-Temperature Gap
Most disruptive innovation prize
2023 results from Sogang University (perovskite QD, 300 K, ~1 nm linewidth) and EPFL (GaN/AlN/Si, 300 K, g²(0) = 0.17) signal room-temperature QD SPEs with acceptable purity are within reach Track this convergence closely; all leading III-V InAs/GaAs systems require cryogenic operation (4–40 K), limiting deployment to laboratory and rack-mounted quantum systems High

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Frequently asked questions

Quantum Dot Single Photon Emitters — key questions answered

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References

  1. Reviewing quantum dots for single-photon emission at 1.55 μm: a quantitative comparison of materials — CNR-IMEM Institute, 2020, Italy
  2. III-nitride quantum dots as single photon emitters — University of Tokyo, 2019, Japan
  3. Fast quantum dot single photon source triggered at telecommunications wavelength — University of California Santa Barbara, 2011, USA
  4. Bright Quantum Dot Single-Photon Emitters at Telecom Bands Heterogeneously Integrated on Si — Technical University of Denmark (DTU Fotonik), 2022, Denmark
  5. Emission properties of single-photon sources based on CdTe/ZnTe quantum dots — Ioffe Institute, 2017, Russia
  6. Semiconductor single-photon sources: progresses and applications — CNRS University Paris Saclay, 2021, France
  7. Engineering telecom single-photon emitters in silicon for scalable quantum photonics — Institute of Ion Beam Physics and Materials Research, 2020, Germany
  8. Single-photon-emitting diodes: a review — Toshiba Research Europe Limited, Cambridge Research Laboratory, 2006, UK
  9. Single dot photoluminescence excitation spectroscopy in the telecommunication spectral range — Wrocław University of Science and Technology, 2019, Poland
  10. Reduction of the fluorescence lifetime of quantum dots in presence of plasmonic nanostructures — Universidad Industrial de Santander, 2019, Colombia
  11. Pure single-photon emission from an InGaN/GaN quantum dot — University of Strathclyde, 2021, UK
  12. Enhanced single photon emission from positioned InP/GaInP quantum dots coupled to a confined Tamm-plasmon mode — Universität Würzburg, 2015, Germany
  13. InP-based single-photon sources operating at telecom C-band with increased extraction efficiency — University of Kassel, 2021, Germany
  14. Ultranarrow Line Width Room-Temperature Single-Photon Source from Perovskite Quantum Dot Embedded in Optical Microcavity — Sogang University, 2023, South Korea
  15. Toward Bright and Pure Single Photon Emitters at 300 K Based on GaN Quantum Dots on Silicon — EPFL, 2020, Switzerland
  16. Wafer-Scale Epitaxial Low Density InAs/GaAs Quantum Dot for Single Photon Emitter in Three-Inch Substrate — Sun Yat-sen University, 2021, China
  17. Position-Controlled Telecom Single Photon Emitters Operating at Elevated Temperatures — National Research Council Canada, 2023, Canada
  18. Deterministically fabricated quantum dot single-photon source emitting indistinguishable photons in the telecom O-band — Technische Universität Berlin, 2020, Germany
  19. Single-Photon Emission from Individual Nanophotonic-Integrated Colloidal Quantum Dots — University of Münster, 2022, Germany
  20. Quantum-dot single-photon source on a CMOS silicon photonic chip integrated using transfer printing — University of Tokyo, 2019, Japan
  21. 3D printed micro-optics for quantum technology: Optimised coupling of single quantum dot emission into a single-mode fibre — 2021
  22. Visible-to-Telecom Quantum Frequency Conversion of Light from a Single Quantum Emitter — Universitaet des Saarlandes, Germany
  23. Single photon sources for quantum radiometry: a brief review about the current state-of-the-art — Physikalisch-Technische Bundesanstalt (PTB), 2022, Germany
  24. WIPO — World Intellectual Property Organization: Quantum Technology Patent Landscape
  25. NIST — National Institute of Standards and Technology: Quantum Information Science
  26. ITU — International Telecommunication Union: Quantum Communication Standards

All data and statistics on this page are sourced from the references above and from PatSnap's proprietary innovation intelligence platform. This landscape is derived from a limited set of patent and literature records retrieved across targeted searches and represents a snapshot of innovation signals within this dataset only.

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