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)
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