Laser Achieves Resolution Over 100... Discovery of New Quantum Principle

[Asia Economy Reporter Junho Hwang] Domestic researchers have discovered a core principle of quantum sensing that enables quantum sensing-level resolution using only laser sensors. It is expected to be applied in various technological fields such as autonomous driving, semiconductors, and medical bioimaging detection technologies utilizing quantum sensors.

Byungseung Ham, director of the Gwangju Institute of Science and Technology (GIST) Center for Quantum Information Processing and professor in the Department of Electrical Engineering and Computer Science, announced on the 3rd that he discovered a new core principle of macroscopic quantum sensing that can achieve resolution more than 100 times beyond the classical diffraction limit using only lasers, and the research results were published in Scientific Reports.

What Professor Ham discovered is a new concept called the 'coherent de Broglie wave.' Coherence is the core principle of interference and means that the wavelength and phase are the same in wave superposition. While the photon de Broglie wave based on quantum entangled pairs, essential in existing quantum sensing, is interpreted as a particle wave of matter waves, the coherent de Broglie wave can be viewed as a wave interpretation.

Professor Ham demonstrated that quantum sensors can be implemented using only lasers, which are used in classical sensors, by utilizing the coherent de Broglie wave. Previously, efforts were focused on securing quantum superiority through photon de Broglie waves based on quantum entangled pairs to implement quantum sensors. However, the number of minimum quantum entangled photon pairs, which is key to securing quantum superiority, needed to be at least 100, but only about 18 pairs were found, making quantum sensor implementation difficult.

Professor Byungseung Ham said, "The significance of this research achievement lies in providing the core principle of next-generation quantum measurement technology that achieves quantum sensing superiority by completely excluding quantum entangled photon pairs and simply using classical lasers in the existing quantum sensing field," adding, "It is expected to provide a new clue to extend quantum physics, which has been limited to the microscopic world, to the macroscopic world."

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