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. 2023 Jul 28;131(4):043605.
doi: 10.1103/PhysRevLett.131.043605.

Phonon Laser in the Quantum Regime

T Behrle  1 , T L Nguyen  1 , F Reiter  1   2 , D Baur  1 , B de Neeve  1 , M Stadler  1 , M Marinelli  1 , F Lancellotti  1 , S F Yelin  2 , J P Home  1   3
Affiliations

Phonon Laser in the Quantum Regime

T Behrle et al. Phys Rev Lett. .

Abstract

We demonstrate a trapped-ion system with two competing dissipation channels, implemented independently on two ion species cotrapped in a Paul trap. By controlling coherent spin-oscillator couplings and optical pumping rates we explore the phase diagram of this system, which exhibits a regime analogous to that of a (phonon) laser but operates close to the quantum ground state with an average phonon number of n[over ¯]<10. We demonstrate phase locking of the oscillator to an additional resonant drive, and also observe the phase diffusion of the resulting state under dissipation by reconstructing the quantum state from a measurement of the characteristic function.

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