Optical Quantum Computing

 Current computing technology has undoubtedly enhanced human convenience. However, the performance of classical computers faces limitations at the ultra-high nanoscale level. Therefore, in order to address complex big data challenges in fields such as chemistry, biology, and data science, the need for a new computing platform becomes apparent. Quantum computing, utilizing the quantum entanglement and superposition, emerges as a promising candidate to overcome these challenges potentially.

 

 Superconductor-based quantum computing has faced challenges in terms of scalability and operating in extreme environments, requiring temperatures below 1 Kelvin. As a result, photon-based optical quantum computing has emerged as a promising alternative. Recent advancements have been made in the utilization of III-V quantum dots (QDs) and perovskite nanocrystals for single-photon emitters, a fundamental technology in optical quantum computing. These materials possess the properties necessary to serve as single-photon emitters, such as high PLQY, ease of mass production, and a long optical coherence time (especially for perovskite nanocrystals).

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 In our lab, we synthesize colloidal inorganic nanocrystals, specifically III-V QDs and perovskite nanocrystals, and study their quantum characteristics like anti-bunching, optical coherence time, and indistinguishability. We fabricate nanomaterials that maximize the properties required for quantum computing and apply them to various quantum device applications such as Boson sampling and entanglement swapping.