We demonstrate theoretically the bundle emission of n strongly correlated phonons in an acoustic cavity QED system. The mechanism relies on anti-Stokes resonances that generate super-Rabi oscillations between states with a large difference in their number of excitations, which, combined with dissipation, transfer coherently pure n-phonon states outside of the cavity. This process works with close to perfect purity over a wide range of parameters and is tunable optically with well-resolved operation conditions. This broadens the realm of quantum phononics, with potential applications for on-chip quantum information processing, quantum metrology, and engineering of new types of quantum devices, such as optically heralded N-phonon guns.
@article{arxiv.1907.12714,
title = {$N$-phonon bundle emission via the anti-Stokes process},
author = {Qian Bin and Xin-You Lü and Fabrice P. Laussy and Franco Nori and Ying Wu},
journal= {arXiv preprint arXiv:1907.12714},
year = {2020}
}