Backaction-Evading Techniques

Backaction-evading techniques



Investigation of techniques (theory and experiment) to avoid limiting measurement back-action in precision metrology, e.g. quantum-optomechanics.


  • all-optical quantum radiation pressure noise reduction (Coherent Quantum Noise Cancellation)
  • Laser power stabilisation via radiation pressure
  • Investigation of membrane-in-the-middle (MiM) / membrane-at-the-edge (MatE) optical resonators for quantum optomechanical experiments (at RT and cryogenic)
  • Testing of micro-optomechanical oscillators for cavity experiments near and below the SQL (collaboration with TG “Novel micro-optomechanical oscillators”)


  • (polarisation-non-degenerate, two-mode) high-frequency squeezed light sources at 1064 nm
  • high-frequency, large-bandwidth, low noise photodetection (single and homodyne)
  • q.o. theory
  • Optical and multi-physics simulations and design
  • various optical and mechanical characterisation

Scientific Output

  • Publications

    Junker J, Wilken D, Johny N, Steinmeyer D, Heurs M. Frequency-Dependent Squeezing from a Detuned Squeezer. Physical review letters. 2022 Jul 14;129(3). 033602.

    Junker J, Wilken D, Huntington E, Heurs M. High-precision cavity spectroscopy using high-frequency squeezed light. Optics express. 2021 Feb 10;29(4):6053-6068.


    Nery MT, Venneberg JR, Aggarwal N, Cole GD, Corbitt T, Cripe J et al. Laser power stabilization via radiation pressure. Optics letters. 2021 Apr 14;46(8):1946-1949.

    Trad Nery M. Laser power stabilization via radiation pressure. Hannover: Leibniz Universität Hannover, 2021.

    Trad Nery M. Laser power stabilization via radiation pressure. Nature Reviews Physics. 2021 Oct;3(10):677.


    Evlyukhin AB, Matiushechkina M, Zenin VA, Heurs M, Chichkov B. Lightweight metasurface mirror of silicon nanospheres [Invited]. Optical materials express. 2020 Sep 30;10(10):2706-2716.


    Nery MT, Danilishin SL, Venneberg JR, Willke B. Fundamental limits of laser power stabilization via a radiation pressure transfer scheme. Optics letters. 2020 Jul 10;45(14):3969-3972.

TG Members

  • Involved Members and their Relevant Expertise
    Members Institution Relevant Expertise
    Michèle Heurs, Leader AEI / LUH Backaction-Evading Techniques; Quantum Optomechanics
    Nenad Kralj AEI Backaction-Evading Techniques
    Roman Kossak AEI / LUH Optomechanically coupled resonators and interferometers in cryogenic environments
    Karsten Danzmann AEI / LUH Gravitational wave detection
    Benno Willke AEI Squeezed Light Sources; Advanced Light Sources
    Marina Trad Nery AEI / LUH Backaction-Evading Techniques
    Klemens Hammerer LUH Backaction-Evading Techniques; Quantum Optomechanics
    Mariia Matiushechkina AEI Backaction-evading techniques; Scattering processes in metamaterial structure; Optical simulations
    Bernd Schulte AEI optomechanical experiments at cryogenic temperatures
    Jonas Junker AEI squeezed light sources; backaction-evading techniques
    Dennis Wilken AEI squeezed light sources; backaction-evading techniques; photodetection
    Harald Lück AEI / LUH Sub-SQL interferometry; Next Generation Gravitational Wave Observatories
    David Wu AEI Sub-SQL interferometry
    Janis Wöhler AEI thermal noise interferometer
    Matteo Carlassara AEI Commissioning of the SQL Interferometer
    Jian Liu AEI Sub-Standard Quantum Limit Interferometry
    Johannes Lehmann AEI mirror supensions
    Christian Vogt ZARM Quantum optomechanics
    Juliane von Wrangel AEI fibre welding, bonding
    Nived Johny AEI Optomechanical experiments at cryogenic temprature
    Sara Al Kershi AEI  
    Luise Kranzhoff Maastricht University  
    Pratik Chakraborty AEI  
    Graziano Pascale AEI  
    Firoz Khan AEI