Former PostDoc

 

 

 

 

The main goal of Max’ work was the experimental realisation of a coherent quantum noise cancellation (CQNC) scheme proposed by Mankei Tsang and Carlton Caves. Here the backacktion noise of an optical cavity field onto an optomechanical oscillator is cancelled by an auxiliary cavity used as a virtual ‘negative mass’ oscillator.

Together with Daniel he investigated the experimental feasibility of the theoretical concept regarding non-ideal matching of parameters and their contribution to reduction of sensitivity. Within this work he calculated a set of parameters for an experiment with a non-degenerate OPO-cavity (NDOPO) and a micromechanical oscillator.

Max also worked on the optical setup for the NDOPO, using a PPKTP-prototype with type-II phasematching to achieve the nonlinear coupling between the main- and the ancilla cavity. He investigated the strength of the non-linear effect and the possible amount of coherent backaction cancellation.

A future task in this project will be the merging of the optical part of the experiment with the mechanical oscillator – this is what Daniel is currently working on. This will be a first step to show coherent cancellation of artificial backaction noise.

In December 2016 Max took up a position in industry 🙂

Selected publications:

• M. Wimmer, D. Steinmeyer, K. Hammerer, M. Heurs: Coherent cancellation of backaction noise in optomechanical force measurements, Physical Review A 89, 053836 (2014)
• M. Wimmer: Coupled nonclassical systems for coherent backaction noise cancellation, PhD thesis, Leibniz Universität Hannover (2016)