Magnetic trapping of ultracold molecules at high density
- URL: http://arxiv.org/abs/2211.11120v2
- Date: Sat, 26 Nov 2022 23:04:24 GMT
- Title: Magnetic trapping of ultracold molecules at high density
- Authors: Juliana J. Park, Yu-Kun Lu, Alan O. Jamison and Wolfgang Ketterle
- Abstract summary: We report magnetic trapping of NaLi molecules in the triplet ground state at high density and ultralow temperature.
This allows studies on both atom-molecule and molecule-molecule collisions in the ultracold regime.
We demonstrate sympathetic cooling of NaLi molecules in the magnetic trap by radio frequency evaporation of co-trapped Na atoms.
- Score: 0.0
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: Trapping ultracold molecules in conservative traps is essential for
applications -- such as quantum state-controlled chemistry, quantum
simulations, and quantum information processing. These applications require
high densities or phase-space densities. We report magnetic trapping of NaLi
molecules in the triplet ground state at high density ($\approx 10^{11} \;
\rm{cm}^{-3}$) and ultralow temperature ($\approx 1\;{\rm \mu K}$). Magnetic
trapping at these densities allows studies on both atom-molecule and
molecule-molecule collisions in the ultracold regime in the absence of trapping
light, which has often lead to undesired photo-chemistry. We measure the
inelastic loss rates in a single spin sample and spin-mixtures of fermionic
NaLi as well as spin-stretched NaLi$+$Na mixtures. We demonstrate sympathetic
cooling of NaLi molecules in the magnetic trap by radio frequency evaporation
of co-trapped Na atoms and observe an increase in the molecules' phase-space
density by a factor of $\approx 16$.
Related papers
- The strongly driven Fermi polaron [49.81410781350196]
Quasiparticles are emergent excitations of matter that underlie much of our understanding of quantum many-body systems.
We take advantage of the clean setting of homogeneous quantum gases and fast radio-frequency control to manipulate Fermi polarons.
We measure the decay rate and the quasiparticle residue of the driven polaron from the Rabi oscillations between the two internal states.
arXiv Detail & Related papers (2023-08-10T17:59:51Z) - High density loading and collisional loss of laser cooled molecules in
an optical trap [5.79316046874697]
SrF molecules from a red-detuned magneto-optical trap (MOT) are compressed and cooled in a blue-detuned MOT.
We observe two-body loss with rate coefficient $beta = 2.7+1.2_-0.8times 10-10 text cm3 text s-1$.
Achieving this density and temperature opens a path to evaporative cooling towards quantum degeneracy of laser-cooled molecules.
arXiv Detail & Related papers (2023-07-11T15:35:51Z) - Evaporation of microwave-shielded polar molecules to quantum degeneracy [1.8133492406483585]
We demonstrate cooling of a three-dimensional gas of fermionic sodium-potassium molecules to well below the Fermi temperature using microwave shielding.
The molecules are protected from reaching short range with a repulsive barrier engineered by coupling rotational states with a blue-detuned circularly polarized microwave.
This large elastic-to-inelastic collision ratio allows us to cool the molecular gas down to 21 nanokelvin, corresponding to 0.36 times the Fermi temperature.
arXiv Detail & Related papers (2022-01-13T18:53:27Z) - Rapid generation of all-optical $^{39}$K Bose-Einstein condensates using
a low-field Feshbach resonance [58.720142291102135]
We investigate the production of all-optical $39$K Bose-Einstein condensates with different scattering lengths using a Feshbach resonance near $33$ G.
We are able to produce fully condensed ensembles with $5.8times104$ atoms within $850$ ms evaporation time at a scattering length of $232.
Based on our findings we describe routes towards high-flux sources of ultra-cold potassium for inertial sensing.
arXiv Detail & Related papers (2022-01-12T16:39:32Z) - Observation of Chemical Reactions between a Trapped Ion and Ultracold
Feshbach Dimers [0.0]
We measure chemical reactions between a single trapped $174$Yb$+$ ion immersed in an ultracold bath of $6$Li atoms.
This produces LiYb$+$ molecular ions that we detect via mass spectrometry.
arXiv Detail & Related papers (2021-10-27T14:42:59Z) - High-resolution 'magic'-field spectroscopy on trapped polyatomic
molecules [62.997667081978825]
Rapid progress in cooling and trapping of molecules has enabled first experiments on high resolution spectroscopy of trapped diatomic molecules.
Extending this work to polyatomic molecules provides unique opportunities due to more complex geometries and additional internal degrees of freedom.
arXiv Detail & Related papers (2021-10-21T15:46:17Z) - Robust storage qubits in ultracold polar molecules [0.0]
We characterise the dominant mechanisms for decoherence of a storage qubit in an optically trapped ultracold gas of RbCs molecules.
Our results unlock the potential of ultracold molecules as a platform for quantum computation.
arXiv Detail & Related papers (2021-03-10T19:20:27Z) - Electrically tuned hyperfine spectrum in neutral
Tb(II)(Cp$^{\rm{iPr5}}$)$_2$ single-molecule magnet [64.10537606150362]
Both molecular electronic and nuclear spin levels can be used as qubits.
In solid state systems with dopants, an electric field was shown to effectively change the spacing between the nuclear spin qubit levels.
This hyperfine Stark effect may be useful for applications of molecular nuclear spins for quantum computing.
arXiv Detail & Related papers (2020-07-31T01:48:57Z) - Dipolar evaporation of reactive molecules to below the Fermi temperature [2.9989215527241453]
Inelastic losses in molecular collisions have greatly hampered the engineering of low-entropy molecular systems.
Here, we use an external electric field along with optical lattice confinement to create a two-dimensional (2D) Fermi gas of spin-polarized potassium-rubidium (KRb) polar molecules.
Direct thermalization among the molecules in the trap leads to efficient dipolar cooling, yielding a rapid increase in phase-space density.
arXiv Detail & Related papers (2020-07-23T22:02:59Z) - Hyperfine and quadrupole interactions for Dy isotopes in DyPc$_2$
molecules [77.57930329012771]
Nuclear spin levels play an important role in understanding magnetization dynamics and implementation and control of quantum bits in lanthanide-based single-molecule magnets.
We investigate the hyperfine and nuclear quadrupole interactions for $161$Dy and $163$Dy nucleus in anionic DyPc$.
arXiv Detail & Related papers (2020-02-12T18:25:31Z) - Optimal coupling of HoW$_{10}$ molecular magnets to superconducting
circuits near spin clock transitions [85.83811987257297]
We study the coupling of pure and magnetically diluted crystals of HoW$_10$ magnetic clusters to microwave superconducting coplanar waveguides.
Results show that engineering spin-clock states of molecular systems offers a promising strategy to combine sizeable spin-photon interactions with a sufficient isolation from unwanted magnetic noise sources.
arXiv Detail & Related papers (2019-11-18T11:03:06Z)
This list is automatically generated from the titles and abstracts of the papers in this site.
This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.