Phys.org November 14, 2024
Entanglement in hybrid quantum systems comprised of fundamentally different degrees of freedom, such as light and mechanics, is of interest for a wide range of applications in quantum technologies. Researchers in Germany proposed engineering bipartite entanglement between traveling acoustic phonons in a Brillouin active solid-state system and the accompanying light wave by applying optical pump pulses to state-of-the-art waveguides, exciting a Brillouin Stokes process. The pulsed approach, in a system operating in a regime orthogonal to standard optomechanical setups, allowed for the generation of entangled photon-phonon pairs, resilient to thermal fluctuations. They proposed an experimental platform where readout of the optoacoustics entanglement was done by the simultaneous detection of Stokes and anti-Stokes photons in a two-pump configuration. According to the researchers the proposed mechanism presents an important feature as it does not require initial preparation of the quantum ground state of the phonon mode… read more. Open Access TECHNICAL ARTICLEÂ
The Brillouin Stokes scattering implies the down conversion of a pump photon… Credit: Phys. Rev. Lett. 133, 203602, 13 November 2024