Controlling the Hyperfine State of Rovibronic Ground-State Polar Molecules

2009/08/27 by S. Ospelkaus, Silke Ospelkaus, K. -K. Ni +13 · 13 citations
Physics and Astronomy · #Atomic and Subatomic Physics Research #Atomic physics #Chemical polarity #Cold Atom Physics and Bose-Einstein Condensates #Degenerate energy levels #Dipole #Excited state #Ground state #Hyperfine structure #Physics #Population #Quadrupole #Quantum #Quantum mechanics #Quantum state #Quantum, superfluid, helium dynamics #cond-mat.other #cond-mat.quant-gas #physics.atom-ph

paper · pdf · doi:10.1103/physrevlett.104.030402

published as Phys. Rev. Lett. 104, 030402 (2010)

arxiv created 2009/08/27 · openalex publication_date 2010/01/20 · arxiv updated 2015/05/14 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

We report the preparation of a rovibronic ground-state molecular quantum gas in a single hyperfine state and, in particular, the absolute lowest quantum state. This addresses the last internal degree of freedom remaining after the recent production of a near quantum degenerate gas of molecules in their rovibronic ground state, and provides a crucial step towards full control over molecular quantum gases. We demonstrate a scheme that is general for bialkali polar molecules and allows the preparation of molecules in a single hyperfine state or in an arbitrary coherent superposition of hyperfine states. The scheme relies on electric-dipole, two-photon microwave transitions through rotationally excited states and makes use of electric nuclear quadrupole interactions to transfer molecular population between different hyperfine states.

Citations

• Quantum Gas of Deeply Bound Ground State Molecules
• Coherent population transfer among quantum states of atoms and molecules
• Table of nuclear magnetic dipole and electric quadrupole moments
• Heteronuclear molecules in an optical dipole trap

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