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Room-Temperature Single-Photon Sources Based on Colloidal Quantum Dots: A Review.
Yongzheng Ye1, Xing Lin2, Wei Fang1,3,4,5
1Interdisciplinary Center for Quantum Information, State Key Laboratory of Extreme Photonics and Instrumentation, College of Optical Science and Engineering, Zhejiang University, Hangzhou 310027, China.
Materials (Basel, Switzerland)
|December 23, 2023
Summary
Colloidal quantum dots (CQDs) are cost-effective materials for high-purity single-photon sources (SPSs) at room temperature. This review covers their optical properties, microcavity coupling, and positioning for on-chip quantum photonics applications.
Area of Science:
- Quantum photonics
- Materials science
- Optoelectronics
Background:
- Single-photon sources (SPSs) are essential for quantum technologies.
- Colloidal quantum dots (CQDs) offer promising room-temperature, high-purity single-photon emission.
- CQDs present a cost-effective alternative to traditional SPS materials.
Purpose of the Study:
- To review the fundamental optical properties of CQDs relevant to SPS applications.
- To explore the integration of CQDs with microcavities for enhanced light-matter interaction.
- To discuss methods for precise CQD localization and positioning for on-chip devices.
Main Methods:
- Overview of CQD optical properties: emission wavelength tuning and fluorescence intermittency.
- Analysis of CQD-microcavity coupling in weak and strong regimes.
- Exploration of techniques for spatial control and placement of individual CQDs.
Main Results:
- CQDs exhibit tunable emission wavelengths and controllable intermittency.
- Successful coupling of single CQDs to microcavities has been demonstrated.
- Methods for precise CQD localization are crucial for device fabrication.
Conclusions:
- CQDs are highly suitable for developing efficient and cost-effective single-photon sources.
- Microcavity integration and precise positioning are key to advancing CQD-based on-chip quantum photonic devices.
- Further research in CQD positioning will enable scalable quantum technologies.
