Speaker: Professor Jack Harris
Affiliation: Yale University, USA


We detect the individual sideband photons produced by an optomechanical device consisting of a nanogram of superfluid helium confined in a cavity. We use the photon-counting data to probe the phonon-phonon correlations (up to fourth order, and for both normal-ordering and anti-normal-ordering) in a single acoustic mode of the superfluid. The data is consistent the assumption that the acoustic mode is in a thermal state with mean phonon number ~ 1. We also show that the acoustic mode can be driven to a coherent amplitude corresponding to several thousand phonons with no decrease in the purity of the acoustic state. We will discuss a number of applications of these results, including to the distribution of entanglement over kilometer-scale optical fiber networks.

About Physics Seminars

The weekly Physics Seminar series focuses on a broad range of physics research within SMP, along with frequent presentations from visiting researchers. Seminars are usually scheduled for 1.00pm on Tuesdays.

The talks are typically more specialised than a colloquium but are often attended by staff and PhD students across a broad range of areas. Speakers are thus encouraged to include introductory material in the talks.

All SMP researchers and HDR students are encouraged to speak. Please email Lewis Williamson to register your interest.

The seminars are open so there is no need to register your attendance.


Physics Annexe (06)
407 (and via Zoom https://uqz.zoom.us/j/94116861984)