Browsing by Subject "Atomic clocks"

Sort by: Order: Results:

  • 0.75 atoms improve the clock signal of 10,000 atoms 
    Kruse, I.; Lange, K.; Peise, J.; Lücke, Bernd; Pezzè, L.; Arlt, Jan J.; Ertmer, Wolfgang; Lisdat, C.; Santos, Luis; Smerzi, A.; Klempt, Carsten (Bellingham, WA : S P I E - International Society for Optical Engineering, 2017)
    Since the pioneering work of Ramsey, atom interferometers are employed for precision metrology, in particular to measure time and to realize the second. In a classical interferometer, an ensemble of atoms is prepared in ...
  • Closed-cycle, low-vibration 4 K cryostat for ion traps and other applications 
    Micke, P.; Stark, J.; King, S.A.; Leopold, T.; Pfeifer, T.; Schmöger, L.; Schwarz, M.; Spieß, L.J.; Schmidt, P.O.; Crespo López-Urrutia, J.R. ([Erscheinungsort nicht ermittelbar] : American Institute of Physics, 2019)
    In vacuo cryogenic environments are ideal for applications requiring both low temperatures and extremely low particle densities. This enables reaching long storage and coherence times, for example, in ion traps, essential ...
  • Evaluation of a Sr+ 88 Optical Clock with a Direct Measurement of the Blackbody Radiation Shift and Determination of the Clock Frequency 
    Steinel, M.; Shao, H.; Filzinger, M.; Lipphardt, B.; Brinkmann, M.; Didier, A.; Mehlstäubler, T. E.; Lindvall, T.; Peik, E.; Huntemann, N. (College Park, Md. : APS, 2023)
    We report on an evaluation of an optical clock that uses the S21/2→D25/2 transition of a single Sr+88 ion as the reference. In contrast to previous work, we estimate the effective temperature of the blackbody radiation ...
  • First international comparison of fountain primary frequency standards via a long distance optical fiber link 
    Guéna, J.; Weyers, S.; Abgrall, M.; Grebing, C.; Gerginov, V.; Rosenbusch, P.; Bize, Sebastien; Lipphardt, B.; Denker, H.; Quintin, N.; Raupach, S.M.F.; Nicolodi, D.; Stefani, F.; Chiodo, N.; Koke, S.; Kuhl, A.; Wiotte, F.; Meynadier, F.; Camisard, E.; Chardonnet, C.; Le Coq, Y.; Lours, M.; Santarelli, G.; Amy-Klein, A.; Le Targat, R.; Lopez, O.; Pottie, P.-E.; Grosche, G. (Bristol : Institute of Physics Publishing, 2017)
    We report on the first comparison of distant caesium fountain primary frequency standards (PFSs) via an optical fiber link. The 1415 km long optical link connects two PFSs at LNESYRTE (Laboratoire National de métrologie ...
  • Gravitational Redshift Tests with Atomic Clocks and Atom Interferometers 
    Di Pumpo, Fabio; Ufrecht, Christian; Friedrich, Alexander; Giese, Enno; Schleich, Wolfgang P.; Unruh, William G. (College Park, MD : American Physical Society, 2021)
    Atomic interference experiments can probe the gravitational redshift via the internal energy splitting of atoms and thus give direct access to test the universality of the coupling between matter-energy and gravity at ...
  • On-line estimation of local oscillator noise and optimisation of servo parameters in atomic clocks 
    Leroux, Ian D.; Scharnhorst, Nils; Hannig, Stephan; Kramer, Johannes; Pelzer, Lennart; Stepanova, Mariia; Schmidt, Piet O. (Bristol : Institute of Physics Publishing, 2017)
    For atomic frequency standards in which fluctuations of the local oscillator (LO) frequency are the dominant noise source, we examine the role of the the servo algorithm that predicts and corrects these frequency fluctuations. ...
  • Optical atomic clocks 
    Ludlow, Andrew D.; Boyd, Martin M.; Ye, Jun; Peik, E.; Schmidt, Piet O. (College Park, MD : American Physical Society, 2015)
    Optical atomic clocks represent the state of the art in the frontier of modern measurement science. In this article a detailed review on the development of optical atomic clocks that are based on trapped single ions and ...
  • Quantum Variational Optimization of Ramsey Interferometry and Atomic Clocks 
    Kaubruegger, Raphael; Vasilyev, Denis V.; Schulte, Marius; Hammerer, Klemens; Zoller, Peter (College Park, Md. : APS, 2021)
    We discuss quantum variational optimization of Ramsey interferometry with ensembles of N entangled atoms, and its application to atomic clocks based on a Bayesian approach to phase estimation. We identify best input states ...
  • Relativistic geodesy 
    Flury, Jakob (Bristol : Institute of Physics Publishing, 2016)
    Quantum metrology enables new applications in geodesy, including relativistic geodesy. The recent progress in optical atomic clocks and in long-distance frequency transfer by optical fiber together pave the way for using ...
  • Robust optical clock transitions in trapped ions using dynamical decoupling 
    Aharon, Nati; Spethmann, Nicolas; Leroux, Ian D.; Schmidt, Piet O.; Retzker, Alex (Bristol : Institute of Physics Publishing, 2019)
    We present a novel method for engineering an optical clock transition that is robust agaiast external field fluctuations and is able to overcome limits resulting from field inhomogeneities. The technique is based on the ...
  • Towards a transportable aluminium ion quantum logic optical clock 
    Hannig, Stephan; Pelzer, L.; Scharnhorst, N.; Kramer, J.; Stepanova, M.; Xu, Z.T.; Spethmann, N.; Leroux, I.D.; Mehlstäubler, Tanja E.; Schmidt, Piet O. (American Institute of Physics : [S.l.], 2019)
    With the advent of optical clocks featuring fractional frequency uncertainties on the order of 10-17 and below, new applications such as chronometric leveling with few-centimeter height resolution emerge. We are developing ...