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Elimination of Thermomechanical Noise in Piezoelectric Optomechanical Crystals

Research output: Contribution to journalLetter

  • H Ramp
  • B D Hauer
  • K C Balram
  • T J Clark
  • K Srinivasan
  • J P Davis
Original languageEnglish
Number of pages5
JournalPhysical Review Letters
Issue number9
DateAccepted/In press - 6 Aug 2019
DatePublished (current) - 30 Aug 2019


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.

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