Quantum backaction evading measurements of a silicon nitride membrane resonator

Yulong Liu, Jingwei Zhou, Laure Mercier De Lépinay, Mika A. Sillanpää*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

2 Citations (Scopus)
132 Downloads (Pure)


Quantum backaction disturbs the measurement of the position of a mechanical oscillator by introducing additional fluctuations. In a quantum backaction measurement technique, the backaction can be evaded, although at the cost of losing part of the information. In this work, we carry out such a quantum backaction measurement using a large 0.5 mm diameter silicon nitride membrane oscillator with 707 kHz frequency, via a microwave cavity readout. The measurement shows that quantum backaction noise can be evaded in the quadrature measurement of the motion of a large object.

Original languageEnglish
Article number083043
Pages (from-to)1-15
Number of pages15
JournalNew Journal of Physics
Issue number8
Publication statusPublished - 1 Aug 2022
MoE publication typeA1 Journal article-refereed


  • micromechanics
  • optomechanics
  • quantum measurement


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