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Nano & Quantum Sensors

Technical University of Munich

Depart. of Electrical and Computer Engineering

Theresienstr. 90/I

80333 Munich

+49 89 289 25332

eva.weig[at]tum.de

Group website

Description

Research focus: nanomechanical systems, cavity optomechanics and circuit electromechanics

Our research is centered around the experimental investigation of nanomechanical and cavity optomechanical systems. Within MQC / MCQST we are particularly interested in their exploitation for for hybrid quantum technologies.


fig1

 
High Q nanoresonators

Reaching ultimate mechanical quality factors is instrumental for the application of nanomechanical systems in quantum technologies. To this end, we are focussing on combing two approaches: Material engineering in order to identify material platforms providing minimum dissipation, and stress engineering in order to boost the mechanical quality factor via dissipation dilution.

fig2

 
Coherent control and state preparation

The nanomechanical two-mode system realized in the avoided crossing of two strongly coupled nanomechanical modes is a remarkable testbed to study Landau-Zener dynamics, Stückelberg interference, and Bloch sphere dynamics. At present, our research is focussing on the implementation of shortcuts to adiabaticity, coherent state preparation protocols allowing for a fast and high-fidelity state initialization.

fig3
 
Spectral evidence of squeezing

The generation of squeezed states can enable quantum sensing applications with higher sensitivity. While squeezed states are conveniently characterized by resolving the full phase space distribution of the underlying fluctuations, this method is not applicable to very high Q resonators. We are exploring spectral methods to characterize squeezed states using driven nonlinear nanomechanical resonators. In particular, two-tone measurements allow to map out not only the thermomechanical squeezing, but also a squeezed vacuum state directly from the response spectrum.



Selected Publications

  • Amplification and spectral evidence of squeezing in the response of a strongly driven nanoresonator to a probe field
    J. S. Ochs (née Huber), M. Seitner, M. I. Dykman, and E. M. Weig
    Phys. Rev. A 103, 013506 (2021)
  • Spectral Evidence of Squeezing of a Weakly Damped Driven Nanomechanical Mode
    J. S. Huber, G. Rastelli, M. J. Seitner, J. Kölbl, W. Belzig, M. I. Dykman, and E. M. Weig
    Phys. Rev. X 10, 021066 (2020)

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