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Displacemon Electromechanics: How to Detect Quantum Interference in a Nanomechanical Resonator

Research output: Contribution to Journal/MagazineJournal articlepeer-review

Article number021052
<mark>Journal publication date</mark>24/05/2018
<mark>Journal</mark>Physical Review X
Number of pages15
Publication StatusPublished
<mark>Original language</mark>English


We introduce the “displacemon” electromechanical architecture that comprises a vibrating nanobeam, e.g., a carbon nanotube, flux coupled to a superconducting qubit. This platform can achieve strong and even ultrastrong coupling, enabling a variety of quantum protocols. We use this system to describe a protocol for generating and measuring quantum interference between trajectories of a nanomechanical resonator. The scheme uses a sequence of qubit manipulations and measurements to cool the resonator, to apply two effective diffraction gratings, and then to measure the resulting interference pattern. We demonstrate the feasibility of generating a spatially distinct quantum superposition state of motion containing more than 10^6 nucleons using a vibrating nanotube acting as a junction in this new superconducting qubit configuration.