Bulletin of the American Physical Society
50th Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics APS Meeting
Volume 64, Number 4
Monday–Friday, May 27–31, 2019; Milwaukee, Wisconsin
Session W02: Hot Topics |
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Chair: John Bollinger, NIST Boulder Room: Wisconsin Center 101AB |
Friday, May 31, 2019 10:30AM - 11:00AM |
W02.00001: Quantum diamond sensors Invited Speaker: Ronald Walsworth The nitrogen–vacancy (NV) quantum defect in diamond is a leading modality for magnetic, electrical, and temperature sensing at short length scales (nanometers to millimeters) under ambient conditions. This technology has wide-ranging application across the physical and life sciences — from NMR spectroscopy at the scale of individual cells to improved biomedical diagnostics to the search for dark matter. I will provide an overview of quantum diamond sensors and their diverse applications. [Preview Abstract] |
Friday, May 31, 2019 11:00AM - 11:30AM |
W02.00002: Quantum-Logic Control and High-Resolution Spectroscopy of a Single Molecular Ion Invited Speaker: Chin-Wen Chou We demonstrate coherent quantum state manipulation and precision spectroscopy of a molecular ion, based on quantum-logic spectroscopy [1-5]. Information regarding the states of a CaH + ion is transferred to a co-trapped Ca + ion using the coupled harmonic motion as an information bus and read out via state- dependent fluorescence detection without disturbing the molecular state. We can thus initialize the molecular ion in a pure quantum state in a probabilistic but heralded fashion [2, 3, 5]. The THz rotational transitions between states with different principal rotational quantum number J are directly probed with a frequency comb [2, 3] with sub-500 Hz spectroscopic linewidths, and improvement to the sub-Hz level seems feasible [6]. Coherent Rabi flopping is observed between different rotational J-manifolds. The initial and final states of the transitions, separated by J = 2, can both be nondestructively detected [2-5], which facilitates unambiguous assignment of the observed signal to the corresponding rotational transitions. We have also started exploring entanglement of a molecular ion with an atomic ion, with possible applications in quantum information science. We implement quantum logic operations to produce an entangled state where states of CaH + , either in the same or different rotational manifolds, are entangled with magnetic sublevels of the S 1/2 and D 5/2 states of Ca + . All of our methods can be extended to investigate and exploit coherent rotational-vibrational transitions of a large class of diatomic and polyatomic molecules in the optical and infrared domains. In collaboration with Y. Lin, A. Collopy, C. Kurz, T. Fortier, S. Diddams, D. Leibfried, and D. Leibrandt. [1] P. O. Schmidt et al., Science 309, 749 (2005). [2] D. Leibfried, New J. Phys. 14, 023029 (2012). [3] S. Ding and D. N. Matsukevich, New J. Phys. 14, 023028 (2012). [4] F. Wolf et al., Nature 530, 457 (2016). [5] C. W. Chou et al., Nature 545, 203 (2017). [6] A. Bartels et al., Opt. Lett. 29, 1081 (2004). [Preview Abstract] |
Friday, May 31, 2019 11:30AM - 12:00PM |
W02.00003: The challenge of a nuclear clock: Recent progress and perspectives Invited Speaker: Lars von der Wense A nuclear optical clock based on a single $^{229}$Th ion is expected to achieve a higher accuracy than the best atomic clocks operational today [1]. Although already proposed back in 2003 [2], this nuclear clock has not yet become reality. The main obstacle that has so far hindered the development of a nuclear clock was an unprecise knowledge of the energy value of a nuclear excited state of the $^{229}$Th nucleus, generally known as the $^{229}$Th isomer. This metastable nuclear excited state is the one of lowest energy in whole nuclear landscape and – with an energy of less than 10 eV – in principle allows for direct nuclear laser excitation, which poses a central requirement for the development of a nuclear clock.\\ \\ In the past few years significant progress toward the development of a nuclear clock has been made: Starting with a first direct detection of the 229 Th isomer in 2016 based on its internal conversion decay channel [3], the isomeric lifetime could be determined in 2017 [4], followed by a first laser-spectroscopic characterization in 2018 [5]. Most recently a first energy determination based on the isomer’s direct detection was successful, thereby constraining the isomeric energy value to sufficient precision to determine the laser technology required in the nuclear clock concept and paving the way for first nuclear laser spectroscopy experiments [6].\\ \\ In the presentation I will give an overview over the current status of the nuclear clock development, with a particular focus on the most recent progress. Also the next required steps will be detailed and future perspectives will be given.\\ \\ [1] C.J. Campbell et al., Phys. Rev. Lett. 108, 120802 (2012). [2] E. Peik, C. Tamm, Eur. Phys. Lett. 61, 181 (2003). [3] L. von der Wense et al., Nature 533, 47 (2016). [4] B. Seiferle et al., Phys. Rev. Lett. 118, 042501 (2017). [5] J. Thielking et al., Nature 556, 321 (2018). [6] B. Seiferle et al., submitted for publication (2019)\\ \\ In collaboration with: Benedict Seiferle, Peter G. Thirolf [Preview Abstract] |
Friday, May 31, 2019 12:00PM - 12:30PM |
W02.00004: Quantum Logic Spectroscopy of an Optical Clock Transition in a Cold Highly Charged Ion Invited Speaker: Steven King Spectroscopy of highly charged ions (HCI) finds applications in frequency metrology and tests of fundamental physics, such as the search for a possible variation of fundamental constants [1], violation of local Lorentz invariance [2], or probing for new long-range interactions [3].\\ \\ Until now, optical spectroscopy of HCI was limited to fractional accuracies of parts-per-million, primarily due to the megakelvin temperature processes needed to produce high charge states, which leads to significant Doppler broadening. This level of fractional accuracy is twelve orders of magnitude behind modern optical atomic clocks.\\ \\ Recently, we have developed methods to extract HCI from an electron beam ion trap (EBIT) and transfer them to a cryogenic linear Paul trap, where we sympathetically cool the HCI with co-trapped laser-cooled Be$^{+}$ ions [4]. We have succeeded in preparing a two-ion crystal of Ar$^{13+}$ and Be$^{+}$ in the ground state of the trap in both axial modes of motion. The corresponding mode temperature of the order 10$^{-4}$ K represents a reduction of ten orders of magnitude since production in the EBIT.\\ \\ We present first results of coherent laser excitation of the 16 Hz wide $^{2}$P$_{1/2}$ to $^{2}$P$_{3/2}$ fine structure transition in Ar$^{13+}$ at 441 nm using the tools of quantum logic spectroscopy. The achieved resolution improves upon the previous best measurement using in-EBIT spectroscopy [5] by more than 6 orders of magnitude. An absolute frequency measurement was performed using an optical frequency comb referenced to the SI second. This work paves the way towards spectroscopy of HCI at the level of state-of-the-art optical frequency standards.\\ \\ References [1] J. C. Berengut, V. A. Dzuba, and V. V. Flambaum, Phys. Rev. Lett. 105 120801 (2010) [2] V. A. Dzuba et al., Nat. Phys. 12 465–8 (2016) [3] J. C. Berengut et al., Phys. Rev. Lett. 120 091801 (2018) [4] T. Leopold et al., arXiv:1901.03082 (2019) 5 I. Draganić et al., Phys. Rev. Lett. 91 183001 (2003) [Preview Abstract] |
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