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Beihang University researchers have demonstrated asymmetric quantum phonon blockade using quadratic optomechanics, achieving over 55 dB contrast for directional control of mechanical vibrations. By leveraging spin effects and specific resonance conditions, the system uniquely utilizes thermal noise to reverse statistical behaviors in one direction while degrading them in another. This breakthrough establishes a viable pathway for developing nonreciprocal phonon switches essential for chiral networks and advanced phononic information processing architectures.
Beihang University Engineers Achieve Quantum Phonon Blocking Asymmetrically
Beihang University researchers demonstrated nonreciprocal phonon blockade in a spin quadratic optomechanical system, achieving a 55 dB contrast ratio.
Engineers at the School of Physics, Beihang University, Beijing, China, have demonstrated a system capable of blocking phonons asymmetrically, achieving a contrast ratio exceeding 55 decibels in directional control of these mechanical vibrations. The work details a quadratic optomechanical system where the behavior of phonons changes depending on the direction of excitation; single-phonon resonance induces conventional phonon blockade in one direction, while two-phonon resonance facilitates phonon-induced tunneling in the other. Researchers revealed that increasing thermal noise reverses the statistics from bunching to antibunching in one direction while degrading antibunching in…
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