Postdoctoral Researchers in Quantum Micromechanics

The Quantum Nanomechanics group  at the Department of Applied Physics, Aalto University, Finland, is looking for Postdoctoral researchers to carry out experimental research on projects related to quantum micromechanical systems. In our team, we investigate how mechanical oscillators can be utilized for fundamental research probing quantum mechanics in massive systems, or for usage in quantum information processing. In our research, we have demonstrated quantum entanglement between two micromechanical oscillators realized as vibrating aluminum drumheads [Nature 556, 478 (2018), Science 372, 625 (2021)]. 

Project 1: Gravitational coupling between nonclassical masses

In this project, the goal is to touch a hundred-year-old mystery of physics: Despite its success at describing phenomena in the low-energy limit, quantum mechanics is incompatible with general relativity that describes gravity and huge energies. We aim at detecting gravitational forces for the first time within a quantum system. We use mechanical oscillators loaded by milligram masses and bring two such gravitationally interacting oscillators into nonclassical motional states. Initially, we will measure the gravitational force between gold particles weighing a milligram, representing a new mass scale showing gravitational forces within a system. 

Project 2: Measurement-based feedback control in quantum micromechanics

We realize “microwave optomechanical” devices, where micromechanical drum oscillators interact with on-chip microwave cavity resonators. Strong measurements and feedback operations allow for novel ways of creating nonclassical mechanical states, for example squeezed and entangled states. A grand goal is to realize quantum teleportation of the state between two oscillators. You will accommodate these devices into a quantum-limited detection system comprising of parametric amplifiers and real-time feedback realized with FPGA control.

Your role and experience

The experimental work in all these projects involves design of the samples and of the measurement setups, cleanroom fabrication, running microwave measurements in dilution refrigerators, and data analysis. 

We require the candidates to have a proven track record in experimental research with similar or related topics, clean room microfabrication, and strong interest in micromechanical systems. Experience with cryogenics and dilution refrigerators, and skill in theoretical understanding of the studied phenomena, are considered significant assets.

The workplace is the Otaniemi Campus of Aalto University, in the premises of the OtaNano national research infrastructure for micro- and nanotechnologies. OtaNano, https://www.aalto.fi/en/otanano, provides access to all the advanced nanofabrication, nanomicroscopy and measurement facilities and techniques. Our team belongs to the national Centre of Excellence – Quantum Technology Finland that is harnessing quantum phenomena for solid-state-based quantum devices and applications. 

To apply for the position, please submit your application to Prof. Mika Sillanpää, Mika.Sillanpaa@aalto.fi. The deadline for applications is June 30, 2024. The positions will be filled as soon as suitable candidates are identified.