The Laboratory of Photonics and Quantum Measurements works broadly defined, in the field of Cross-Quantum Technology, i.e. it uses quantum mechanical processes such as parametric frequency conversion or radiation pressure quantum effects in both emerging classical applications in technology, as well as fundamental quantum science and technology experiments.
Specifically, we study in our laboratory quantum effects in engineered micro- and nanomechanical oscillators. Mechanical devices are already part of our information technology for timekeeping or acceleration sensors or wireless filters. Advances in Cavity quantum optomechanics has made it possible to extend quantum control routinely achieved over atoms, molecules and ions to macroscopic mechanical oscillators. In our laboratory we are using laser, or microwave fields to explore the quantum mechanical interaction of light and mechanical oscillators. This is part of a field, that is nowadays called cavity quantum optomechanics. In our laboratory we are studying methods to manipulate, control and cool mechanical oscillators to the quantum regime using both nano-optomechanical systems, as well as superconducting circuit electromechanical devices cooled to milli-Kelvin temperatures. Experimentally, we are designing and fabricating towards this aim optical and mechanical micro and nano-resonators, devices which are capable of storing photons or phonons in small volumes for extended amount of times. Our laboratory has developed many techniques to cool, manipulate and utilise mechanical oscillators in the quantum regime.
In addition we have discovered that the nonlinear optical properties of high Q microresonators allow the generation of optical frequency combs via parametric frequency conversion. Optical frequency combs have revolutionized frequency metrology and laser science over the past decade. Microresonator frequency combs, as first developed by our laboratory, may promise a second revolution by enabling unprecedented compactness, wafer scale integration level, as well high optical bandwidth and repetition rates. Such micro-combs have already been applied to massively parallel terabit coherent communication, dual combs spectroscopy, as well as astro-physical spectrometer calibration for exo-planet searches. Microcombs could impact a wide range of technologies, from biomedical imaging in OCT to chip-scale atomic clocks. We are exploring both the fundamental soliton dynamics, novel microresonator platforms and are pursing new applications of micro-combs,
Our research is at the interface of quantum and nonlinear optics with micro- and nanofabrication, combines quantum theory with experiment, utilizes low temperature techniques to reach milli-Kelvin temperature, combines theory with experiment, is fundamental in nature but has applied aspects, and is entirely embodied in table top experiments. Experimentalist and also theorist contribute to the team.
General audience overview talk: The Physics of High-Q microresonators: from optomechanics to chipscale frequency combs, Moscow 2013 (video)
Selected talks on microresonator frequency combs: CLEO US 2019 Tutorial on “Chipscale Soliton Microcombs” See review: Microresonator-Based Optical Frequency combs [Science Review 2011]