Spin-Orbit Coupling Induced Back-action Cooling in Cavity-Optomechanics with a Bose-Einstein Condensate

摘要

We report a spin-orbit coupling induced back-action cooling in anoptomechanical system, composed of a spin-orbit coupled Bose-Einsteincondensate trapped in an optical cavity with one movable end mirror, bysuppressing heating effects of quantum noises. The collective densityexcitations of the spin-orbit coupling mediated hyperfine states - serving asatomic oscillators equally coupled to the cavity field - trigger stronglydriven atomic back-action. We find that the back-action not only revampslow-temperature dynamics of its own but also provides an opportunity to coolthe mechanical mirror to its quantum mechanical ground state. Further, wedemonstrate that the strength of spin-orbit coupling also superintends dynamicstructure factor and squeezes nonlinear quantum noises, like thermo-mechanicaland photon shot noise, which enhances optomechanical features of hybrid cavitybeyond the previous investigations. Our findings are testable in a realisticsetup and enhance the functionality of cavity-optomechanics with spin-orbitcoupled hyperfine states in the field of quantum optics and quantumcomputation.