Quality factor (Q) is an important property of micro-and nano-electromechanical (MEM/NEM)
resonators that underlie timing references, frequency sources, atomic force microscopes …

Quantized vortices are fundamental to the two-dimensional dynamics of superfluids, from
quantum turbulence to phase transitions. However, surface effects have prevented direct …

Superfluidity is a quantum state of matter that exists macroscopically in helium at low
temperatures. The elementary excitations in superfluid helium have been probed with great …

Brillouin scattering has applications ranging from signal processing,, sensing and
microscopy to quantum information and fundamental science,. Most of these applications …

An accelerated observer moving through empty space sees particles appearing and
disappearing, while an observer with a constant velocity does not register any particles. This …

We demonstrate a hermetically sealed packaging system for integrated photonic devices at
cryogenic temperatures with plug-and-play functionality. This approach provides the ability …

Helium is recognized as a model system for the study of phase transitions. Of particular
interest is the superfluid phase in two dimensions. We report measurements on superfluid …

Excitations in superfluid helium represent attractive mechanical degrees of freedom for
cavity optomechanics schemes. Here we numerically and analytically investigate the …

We show that highly confined superfluid films are extremely nonlinear mechanical
resonators, offering the prospect to realize a mechanical qubit. Specifically, we consider …

Finite-temperature quantum turbulence is often described in terms of two immiscible fluids
that can flow with a nonzero-mean relative velocity. Such out-of-equilibrium state is known …