QRC Seminars - Prof. Simon Gröblacher

QRC Seminars - Prof. Simon Gröblacher

Prof. Simon Gröblacher

Kavli Institute of Nanoscience - Delft University of Technology

24th May 2021 - 4.00pm - 5.00pm (GST)



Quantum acoustics experiments


Mechanical systems have recently attracted significant attention for their potential use in quantum information processing tasks, for example, as compact quantum memories or as transducers between different types of quantum systems. Early experiments included ground-state cooling of the mechanical motion and squeezing of the optical field. Recent advances have allowed to perform measurements which realize various mechanical quantum states.

Here, we would like to discuss several experiments where we demonstrate non-classical behavior of mechanical motion by coupling a micro-fabricated acoustic resonator to single optical photons. Our approach is based on optomechanical crystals, which possess engineered mechanical resonances in the Gigahertz regime that can be addressed optically from the conventional telecom band. Our measurements establish quantum control over acoustic motion, including the heralded generation and on-demand readout of single phononic excitations.

We further demonstrate high quality light-matter entanglement as well as heralded entanglement between two mechanical modes employing quantum optics protocols. These results are a promising step towards using such devices for quantum information processing tasks and testing quantum physics with massive objects.