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Special Physics Colloquium: Hybrid Quantum Systems with Bulk Acoustic Wave Resonators
September 28, 2017 @ 1:00 pm - 2:00 pm
“Hybrid Quantum Systems with Bulk Acoustic Wave Resonators”
Abstract: The ability to engineer and manipulate different varieties of quantum mechanical objects allows us to take advantage of their unique properties and create useful hybrid technologies. Thus far, complex quantum states and exquisite quantum control have been demonstrated in systems ranging from trapped ions and solid state qubits to superconducting microwave resonators. Recently, there have been many efforts to extend these demonstrations to the motion of complex, macroscopic objects, which have important practical applications in the fields of quantum information and metrology as quantum memories or transducers for measuring and connecting different types of quantum systems. In particular, there have been a few experiments which couple motion to nonlinear quantum objects such as superconducting qubits. This opens up the possibility of creating, storing, and manipulating non-Gaussian quantum states in mechanical degrees of freedom. However, before sophisticated quantum control of mechanical motion can be achieved, we must overcome the challenge of realizing systems with long coherence times while maintaining a sufficient interaction strength. These systems should be implemented in a simple and robust manner that allows for increasing complexity and scalability in the future. In this talk, I will focus on our recent experiments demonstrating a high frequency bulk acoustic wave (BAW) resonator that is strongly coupled to a superconducting qubit using piezoelectricity . Our device requires only simple fabrication methods, extends coherence times to many microseconds, and provides controllable access to a multitude of phonon modes. We use this system to demonstrate basic quantum operations on the coupled qubit-phonon system. In addition, I will briefly describe our experiments using a combination of microwave circuits, BAW resonators, and infrared optics for transduction and high sensitivity measurements of materials properties.
Marquez Hall room 122