Condensed Matter Seminar: Quantum control with nanomechanical oscillators
Itay Shomroni, EPFL, Lausanne, Switzerland
Quantum optomechanics, the study of mechanical motion in the quantum regime using light, is an emerging field with applications ranging from sensing to quantum information to exploring the classical-to-quantum transition. Although its foundations had been laid in the 60s and 70s, quantum effects in macroscopic mechanical motion, such as motional sideband asymmetry, radiation pressure shotnoise, and ponderomotive squeezing, have been observed only in the recent decade, with advances in high-finesse microcavities. Mechanical oscillators based on photonic crystals are one of the most promising systems for probing and manipulating quantum motion, allowing efficient cooling to the motional ground tate using light as well as quantum-coherent operations. I will describe my recent research with these systems, which includes the first demonstration of backaction-evading measurement of mechanical motion in the optical domain. Such measurement, originally proposed in the context of gravitational wave detection, allows in principle arbitrary sensitivity by measuring only a single quadrature of the motion, beating the quantum limit imposed by Heisenberg's uncertainty relation. In addition, entering the regime of strongly-probed mechanical systems close to their ground state has revealed novel phenomena such as interplay of optomechanics and other Kerr-type effects, and new dynamics that lead to extraordinary instabilities. Quantum optomechanics is now entering a new era where full quantum control is feasible, and I will give my outlook and possible future directions.
Event Organizer: Dr. Moshe Goldstein