Elimination of Thermomechanical Noise in Piezoelectric Optomechanical Crystals

H Ramp, B D Hauer, K C Balram, T J Clark, K Srinivasan, J P Davis

Research output: Contribution to journalLetter (Academic Journal)peer-review

19 Citations (Scopus)
242 Downloads (Pure)


Mechanical modes are a potentially useful resource for quantum information applications, such as quantum-level wavelength transducers, due to their ability to interact with electromagnetic radiation across the spectrum. A significant challenge for wavelength transducers is thermomechanical noise in the mechanical mode, which pollutes the transduced signal with thermal states. In this Letter, we eliminate thermomechanical noise in the GHz-frequency mechanical breathing mode of a piezoelectric optomechanical crystal using cryogenic cooling in a dilution refrigerator. We optically measure an average thermal occupancy of the mechanical mode of only 0.7 0.4 phonons, providing a path towards low-noise
microwave-to-optical conversion in the quantum regime.
Original languageEnglish
Number of pages5
JournalPhysical Review Letters
Issue number9
Publication statusPublished - 30 Aug 2019

Structured keywords

  • Bristol Quantum Information Institute
  • Photonics and Quantum


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