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Yale researchers have successfully coupled microwave photons with high-frequency phonons in bulk lithium niobate crystals using piezoelectric coupling within a three-dimensional cavity. This breakthrough eliminates the need for complex nanofabrication, enabling efficient excitation of milligram-scale mechanical modes at 110 GHz and supporting precision tests of quantum physics at elevated temperatures. The achievement establishes a versatile platform for developing hybrid quantum technologies that leverage large-volume acoustic waves with minimal damping.

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Yale Researchers Couple Microwave Photons to 110 GHz Phonons

Quantum ZeitgeistJuly 14, 20265 min read

Yale researchers coupled microwave energy to 110 GHz vibrational modes, or phonons, in lithium niobate crystals.

Researchers at Yale University, led by Boxuan Tian, Jiacheng Xie, and Hong X. Tang in the Department of Electrical Engineering, have demonstrated the ability to excite mechanical vibrations at 110 GHz within a bulk lithium niobate crystal, with cooperativity up to 16.6 at 110 GHz. This enables efficient, non-contact excitation of centimeter-scale, milligram-mass vibrational modes across 7.0, 110 GHz, and establishes a versatile platform for precision tests of mechanical quantum physics at elevated temperatures and potentially enables new hybrid quantum technologies. Mechanical quality factors reach up to 30,000 at W band frequencies. A milligram-scale lithium niobate crystal has been made to vibrate at 110 gigahertz,…

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