17:00 (CET) May 18, Prof. Dr. Edward Laird (Lancaster University)
Title: Displacemon electromechanics: an approach towards testing quantum interference using a tethered vibrating carbon nanotube
Suspended carbon nanotubes are mechanical resonators that are well suited for incorporation into quantum electronic circuits. They also combine high frequency and high quality factor in a way that makes them suitable for creating nanomechanical sensors and potentially for creating quantum superpositions. In the first part of this talk, I will describe an experiment in which a suspended nanotube hosting a single-electron transistor enters a classical coherent state, analogous to a laser mode but with phonons replacing photons . In the second part, I will describe a proposal to incorporate a vibrating nanotube into a superconducting qubit and to operate the device as an interferometer. In this “displacemon” device, the aim is to observe interference between distinct centre-of-mass trajectories of the entire nanotube, consisting of 10^6 nucleons .
 Wen, Y., Ares, N., Schupp, F. J., Pei, T., Briggs, G. A. D., & Laird, E. A.
A coherent nanomechanical oscillator driven by single-electron tunnelling
Nature Physics 16 75 (2020)
 Khosla, K. E., Vanner, M. R., Ares, N., & Laird, E. A.
Displacemon electromechanics: how to detect quantum interference in a nanomechanical resonator
Physical Review X 8 021052 (2018)
Thank you for your interest in our research. Get in touch with us for any questions or comments regarding research in the interface of quantum mechanics, field theory and gravity.