A millikelvin all-fiber cavity optomechanical apparatus for merging with ultra-cold atoms in a hybrid quantum system

Abstract

We describe the construction of an apparatus designed to realize a hybrid quantum system comprised of a cryogenically cooled mechanical oscillator and ultra-cold ${}^{87}$Rb atoms coupled via light. The outstanding feature of our instrument is an in-situ adjustable asymmetric all-fiber membrane-in-the-middle cavity located inside an ultra-high vacuum dilution refrigerator based cryostat. We show that Bose-Einstein condensates of $N=2\times 10^6$ atoms can be produced in less than 20 s and demonstrate a single photon optomechanical coupling strength of $g_0=2\pi \times 9$ kHz employing a high-stress Si${}_3$N${}_4$ membrane with a mechanical quality factor $Q_{\mathrm{m}}>10^7$ at a cavity set-up temperature of $T_{\mathrm{MiM}}=480$ mK.

12 pages, 12 figures; added references; modified figures

References in corpus (10)

• Sideband Cooling Micromechanical Motion to the Quantum Ground State
• Strong dispersive coupling of a high finesse cavity to a micromechanical membrane
• Quantum technologies with hybrid systems
• Bose-Einstein condensate coupled to a nanomechanical resonator on an atom chip
• Establishing EPR-channels between Nanomechanics and Atomic Ensembles
• Sympathetic cooling of a membrane oscillator in a hybrid mechanical-atomic system
• Cavity-Enhanced Long-Distance Coupling of an Atomic Ensemble to a Micromechanical Membrane
• Hybrid optomechanical cooling by atomic $\Lambda$ systems
• Observation of decoherence in a carbon nanotube mechanical resonator
• Long Distance Coupling of a Quantum Mechanical Oscillator to the Internal States of an Atomic Ensemble