Single-Phonon Addition and Subtraction to a Mechanical Thermal State
Georg Enzian, J. J. Price, L. Freisem, Joshua Nunn, Jiří Janoušek, B. C. Buchler, Ping Koy Lam, Michael R. Vanner
Abstract
Adding or subtracting a single quantum of excitation to a thermal state of a bosonic system has the counter-intuitive effect of approximately doubling its mean occupation. We perform the first experimental demonstration of this effect outside optics by implementing single-phonon addition and subtraction to a thermal state of a mechanical oscillator via Brillouin optomechanics in an optical whispering-gallery microresonator. Using a detection scheme that combines single-photon counting and optical heterodyne detection, we observe this doubling of the mechanical thermal fluctuations to a high precision. The capabilities of this joint click-dyne detection scheme adds a significant new dimension for optomechanical quantum science and applications.