02.05.2018

Research and collaboration

In our work we investigate how it is possible to shape the properties of quantum systems when coupled to an environment. In particular, we study, at the quantum level, the case of cavity optomechanical systems: i.e. systems in which mechanical and radiation degrees of freedom interact in optical cavities in the quantum regime.

One of the most striking consequences of quantum theory is represented by the concept of entanglement: the dynamics of two quantum particles can be prepared such that their motion is inextricably correlated, in ways that would be impossible for objects described by classical physics. In recent years, researchers have been exploring how entanglement can be generate in macroscopic objects.

In this work [1], resulting from an international collaboration between the University of Jyväskylä, with Aalto University, UNSW (Australia) and University of Chicago (US), we demonstrated that we can generate an entangled state for the dynamics of two nearly-macroscopic mechanical objects each constituted by 10^12 atoms. These mechanical are constituted by two vibrating membranes coupled to a microwave resonator. We showed that, by appropriately driving the microwave circuit, the two vibrating membranes entrer a quantum-correlated state of motion, impossible for classical objects.

Our findings, on the one hand, provide new understanding of the quantum behavior of systems at the macroscopic scale, but has the potential to generate technological applications in the field of ultra-sensitive measurements and secure communications.

[1] C. F. Ockeloen-Korppi, E. Damskägg, J. M. Pirkkalainen, M. Asjad, A. A. Clerk, F. Massel, M. J. Woolley, and M. A. Sillanpää, Nature 556, 478 (2018).