Bulletin of the American Physical Society
51st Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Volume 65, Number 4
Monday–Friday, June 1–5, 2020; Portland, Oregon
Session H05: Molecular Spectroscopy with Fundamental ApplicationsInvited Live
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Sponsoring Units: GPMFC Chair: David Hanneke, Amherst College Room: D139-140 |
Wednesday, June 3, 2020 10:30AM - 11:00AM Live |
H05.00001: Quantum Logic Control of a Single Molecular Ion Invited Speaker: Dietrich Leibfried An amazing level of quantum control is routinely reached in modern experiments with atoms, but similar control over molecules has been an elusive goal. A method based on quantum logic spectroscopy [1] can address this problem for a wide class of molecular ions [2,3]. We have now realized the basic elements of these proposals.\\ \\ In our demonstration, we trap a calcium ion together with a calcium hydride ion (CaH$^+$) that is a convenient stand-in for more general molecular ions. We laser-cool the two-ion crystal to its motional ground state and then drive Raman-transitions in the molecular ion, where a transition in the molecule also deposits a single quantum of excitation in the motion of the ion pair (motional``sideband''). We can efficiently detect this single quantum of excitation with the calcium ion, which projects the molecule into the final state of the sideband transition, a known, pure quantum state.\\ \\ The molecule can be coherently manipulated after the projection, and its resulting state read out by another quantum logic state detection [4,5] or alternatively, an entangled state between the logic ion and the molecule can be created [6]. All transitions we address in the molecule are either driven by a single, far off-resonant continuous-wave laser or by a far-off-resonant frequency comb. This makes our approach suitable for quantum control and precision measurement of a large class of molecular ions.\\ \\ {[1]} P.O. Schmidt,{\it et al.} Science {\bf 309}, 749 (2005).\\ {[2]} S. Ding, S. and D. N. Matsukevich, New J. Phys. {\bf 14}, 023028 (2012).\\ {[3]} D. Leibfried, New J. Phys. {\bf 14}, 023029 (2012) .\\ {[4]} C.-W. Chou, {\it et al.}, Nature {\bf 545}, 203 (2017).\\ {[5]} C.W. Chou {\it et al.}, arXiv1911.12808 (2019).\\ {[6]} Y. Lin {\it et al.}, arXiv:1912.05866 (2019). [Preview Abstract] |
Wednesday, June 3, 2020 11:00AM - 11:30AM Live |
H05.00002: Molecular Lattice Clocks in the Optical Domain Invited Speaker: Mateusz Borkowski Weakly bound molecules promise unparalleled sensitivity to temporal variations of the proton-to-electron mass ratio\footnote{Zelevinsky T, Kotochigova S, Ye J, Phys. Rev. Lett. 100 043201 (2008)} and in searches for new interactions beyond the Standard Model\footnote{Borkowski M, Buchachenko AA, Ciuryło R, Julienne PS, Yamada H, Kikuchi Y, Takasu Y, Takahashi Y 2018 Sci. Rep. 9, 14807 (2019)}. Both applications, however, rely on measurements of vibrational state positions of yet unrealized accuracy. To mitigate this, we propose to observe clock $^1$S$_0$-$^3$P$_0$ transitions in weakly bound bosonic $^{174}$Yb$_2$ molecules\footnote{Borkowski M, Phys. Rev. Lett. 120 083202 (2018)} facilitated by applying an external magnetic field\footnote{Taichenachev AV, et al. Phys. Rev. Lett. 96 083001 (2006)}. We predict the positions of molecular clock lines using photoassociation spectroscopy data for the ground state~\footnote{Borkowski M, Buchachenko AA, Ciuryło R, Julienne PS, Yamada H, Kikuchi Y, Takahashi K, Takasu Y, and Takahashi Y Phys. Rev. A 96 063405 (2017)}, and ab initio long range parameters\footnote{Porsev SG, Safronova MS, Derevianko A, and Clark CW Phys. Rev. A 89 012711 (2014)} and the recently measured $^{174}$Yb $^1$S$_0$-$^3$P$_0$ scattering length\footnote{Franchi L, et al. New J. Phys. 19 103037 (2017)} for clock state vibrational energies. The necessary ground state Yb$_2$ molecules could be efficiently produced by STIRAP. Thanks to favorable Franck-Condon factors the magnetically induced molecular Rabi frequencies can be comparable to the atomic Rabi frequencies under same laser intensities and magnetic fields. Using new ab initio potentials\footnote{P. Tecmer, et al., Int. J. Quant. Chem. 119, e25983 (2019) } we also evaluate the sensitivity of the excited clock states to changes in the proton-to-electron mass ratio. [Preview Abstract] |
Wednesday, June 3, 2020 11:30AM - 12:00PM Live |
H05.00003: Quantum-Non-Demolition State Detection of Single Molecules for Precise Molecular Spectroscopy Invited Speaker: Stefan Willitsch Inspired by methods established within the realms of quantum optics and atomic-ion quantum technologies, we demonstrate a quantum-non-demolition technique for the non-destructive detection of the internal quantum state of a single trapped molecular ion. The method is based on the state-dependent coherent excitation of the motion of the molecular ion and subsequent detection of the motional quantum state using a co-trapped atomic ion. This new approach offers new perspectives not only for the detection, but also for the preparation and the manipulation of molecular quantum states on the single-particle level with a greatly improved sensitivity compared to previously used destructive schemes. We present a characterisation of our technique using the homonuclear diatomic species N$_2^+$ as an example, show how it can be used for non-invasive spectroscopic measurements on single molecules and discuss prospective applications in the realm of precision molecular spectroscopy. [Preview Abstract] |
Wednesday, June 3, 2020 12:00PM - 12:30PM On Demand |
H05.00004: Measurement of the Variation of Electron-to-Proton Mass Ratio Using Ultracold Molecules Produced from Laser-Cooled Atoms Invited Speaker: Shin Inouye A rovibrationally pure sample of ultracold KRb molecules was used to improve the measurement on the stability of electron-to-proton mass ratio ($\mu = \frac{m_e}{M_p}$). The measurement was based upon a large sensitivity coefficient of the molecular spectroscopy, which utilizes a transition between nearly degenerate pair of vibrational levels each associated with a different electronic potential. Observed limit on temporal variation of $\mu$ was $\frac{1}{\mu}\frac{d\mu}{dt} = (0.30\pm1.0) \times 10^{-14}/$year, which was better by a factor of five compared with the most stringent laboratory molecular limits to date. We also report our effort on trapping ultracold rovibrationally ground state molecules using a cavity-enhanced optical dipole trap. [Preview Abstract] |
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