Quantum Colloquium | Measuring high-amplitude quantum motion in a nanogram object
Date
Tuesday, December 19, 2023 11:00 - 12:00
Speaker
Jack Harris (Yale University)
Location
Office Bldg West / Ground floor / Heinzel Seminar Room
Series
Seminar/Talk
Tags
Physical Sciences Seminar, quantum_seminar_ics
Host
Onur Hosten
Contact
I will describe measurements of individual phonons in a 1 ng body of superfluid helium. When this body is in equilibrium, its phonon correlations are consistent (up to 4th order) with a thermal state of mean occupancy ~ 1. This purity is preserved even when the mode is driven to a coherent state with an amplitude corresponding to ~100,000 phonons. I will describe how these results can be used to constrain nonlinear extensions of quantum mechanics, and to distribute entanglement over kilometer-scale optical fiber networks.