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The Japan Society of Applied Physics

Simultaneous measurements of spatial image and low-dark-count intensity correlation on room-temperature photoluminescence of single colloidal quantum dots

Toshiyuki Ihara, Shigehito Miki, Yamada Toshiki, Hirotaka Terai

Published Jul 10, 2019• 0 citations
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physics.opticsCross-listedarXiv:2609.16692•Sep 16, 2026
Abstract The realization of high-quality quantum emitters that can operate at room temperature is important for accelerating the application of quantum technologies, such as quantum communication, quantum information processing, and quantum metrology. In this work, we study the photon-antibunching properties on room-temperature emission from individual colloidal quantum dots (CQDs) using superconducting-nanowire single-photon detectors and temporal filtering of the photoluminescence decay curve. We find that high single-photon purities and high photon-generation rates can be simultaneously achieved by removing the signals originating from the sequential two-photon emission of biexcitons created by multiple excitation pulses. We successfully demonstrate that the ultrahigh performance of the room-temperature single-photon sources showing g(2)(0) ≪ 10−2 can be confirmed by the ultralow-dark-count detection of the temporally purified single photons. These findings provide strong evidence for the attractiveness of CQDs as candidates for high-quality room-temperature quantum light sources.
ABSTRACT Quantum‐correlated techniques enable high‐contrast and super‐resolution imaging through the feature of correlated photons. The superbunching effect with a second‐order correlation larger than 2, i.e., g (2) (0) > 2, demonstrates the existence of strong correlations between photons, which can enable stray light resistance and achieve high‐contrast imaging. Here, we present a scheme for quantum correlated imaging using single colloidal quantum dots (CQDs) with strong superbunching emission. The optimized CdSe/ZnS CQDs with g (2) (0) up to 69 and 20 under continuous‐wave and pulsed laser excitation have been prepared. We achieved noise‐resistant correlated biphoton imaging (CPI) based on single CQDs with noise intensity 104 times stronger than their photoluminescence. By modulating photoluminescence intensity, the Fourier‐domain CPI was determined with reasonably good contrast, despite noise 75 600 times stronger than biphoton counts. Our proposal may enable laboratory‐based quantum imaging to be applied to real‐world applications with the desired suppression of intense stray light.
While optical manipulation of atomic arrays has reached a high degree of precision and scalability, the stable optical confinement of solution-based artificial atoms like colloidal quantum dots (CQDs) remains hindered by weak trapping forces and thermal fluctuations. High-intensity trapping often compromises the quantum properties of these emitters, creating a significant trade-off between mechanical stability and optical integrity. To overcome this, we propose encapsulating CQDs within a transparent polymer matrix, thereby increasing the effective interaction volume and optical restoring force without altering the emitters themselves. This strategy allows for stable spatial confinement under standard experimental conditions, as evidenced by the direct resolution of positional fluctuations through photoluminescence imaging and trajectory tracking. With averaged position fluctuations below 20 nm, the intrinsic emission spectra and photoluminescence decay dynamics remain largely unaffected, and photon-correlation measurements confirm the full preservation of single-photon emission. These findings establish a robust method for the controlled confinement of colloidal quantum emitters and in-situ quantum-optical measurements for future advancements in quantum-optical manipulation of artificial atoms.