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| Brillouin Optomechanics in Whispering-Gallery-Mode Microresonators: strong coupling, the lasing transition, and single-phonon addition and subtraction operations |
| Prof Michael Vanner |
Imperial College, London |
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15:00, Friday 23 May 2025 | | Chemistry Common Room (Building 29/2067) |
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Brillouin-Mandelstam scattering in whispering-gallery-mode microresonators offers an exciting avenue to pursue both classical and quantum optomechanics applications. Our team — the Quantum Measurement Lab — together with our collaborators, are currently exploring and utilizing the favourable properties this platform affords for non-Gaussian motional state preparation of acoustic fields. In particular, the high acoustic frequencies, acoustic mode selectivity, and low optical absorption provide a promising route to overcome current hindrances within optomechanics. Some of our key recent results in this direction include: the first observation of Brillouin optomechanical strong coupling, single-phonon addition and subtraction to a thermal state of the acoustic field, advancing the state-of-the-art of mechanical state tomography to observe the non-Gaussian states generated by single- and multi-phonon subtraction, and studying the second-order coherence across the Brillouin lasing threshold. This talk will cover these results, what they enable, and the broader direction of our lab including the prospects of this platform for quantum science and technology. Time permitting, the talk will also cover our latest experimental research demonstrating enhanced laser cooling via zero-photon detection, and our studies of Brillouin scattering in optical fibre at millikelvin temperatures.
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