Zobrazeno 1 - 10
of 385
pro vyhledávání: '"McGrew W"'
Autor:
Zhang, X., Beloy, K., Hassan, Y. S., McGrew, W. F., Chen, C-C, Siegel, J. L., Grogan, T., Ludlow, A. D.
Laser cooling is a key ingredient for quantum control of atomic systems in a variety of settings. In divalent atoms, two-stage Doppler cooling is typically used to bring atoms to the uK regime. Here, we implement a pulsed radial cooling scheme using
Externí odkaz:
http://arxiv.org/abs/2206.09056
Experiments involving optical traps often require careful control of the ac Stark shifts induced by strong confining light fields. By carefully balancing light shifts between two atomic states of interest, optical traps at the magic wavelength have b
Externí odkaz:
http://arxiv.org/abs/2103.12052
Autor:
Beloy, K., McGrew, W. F., Zhang, X., Nicolodi, D., Fasano, R. J., Hassan, Y. S., Brown, R. C., Ludlow, A. D.
Publikováno v:
Phys. Rev. A 101, 053416 (2020)
We develop a model to describe the motional (i.e., external degree of freedom) energy spectra of atoms trapped in a one-dimensional optical lattice, taking into account both axial and radial confinement relative to the lattice axis. Our model respect
Externí odkaz:
http://arxiv.org/abs/2004.06224
Autor:
Brewer, S. M., Chen, J. -S., Beloy, K., Hankin, A. M., Clements, E. R., Chou, C. W., McGrew, W. F., Zhang, X., Fasano, R. J., Nicolodi, D., Leopardi, H., Fortier, T. M., Diddams, S. A., Ludlow, A. D., Wineland, D. J., Leibrandt, D. R., Hume, D. B.
Publikováno v:
Phys. Rev. A 100, 013409 (2019)
We have measured the quadratic Zeeman coefficient for the ${^{1}S_{0} \leftrightarrow {^{3}P_{0}}}$ optical clock transition in $^{27}$Al$^{+}$, $C_{2}=-71.944(24)$~MHz/T$^{2}$, and the unperturbed hyperfine splitting of the $^{25}$Mg$^{+}$ $^{2}S_{1
Externí odkaz:
http://arxiv.org/abs/1903.04661
Autor:
McGrew, W. F., Zhang, X., Leopardi, H., Fasano, R. J., Nicolodi, D., Beloy, K., Yao, J., Sherman, J. A., Schäffer, S. A., Savory, J., Brown, R. C., Römisch, S., Oates, C. W., Parker, T. E., Fortier, T. M., Ludlow, A. D.
The pursuit of ever more precise measures of time and frequency is likely to lead to the eventual redefinition of the second in terms of an optical atomic transition. To ensure continuity with the current definition, based on a microwave transition b
Externí odkaz:
http://arxiv.org/abs/1811.05885
Autor:
McGrew, W. F., Zhang, X., Fasano, R. J., Schäffer, S. A., Beloy, K., Nicolodi, D., Brown, R. C., Hinkley, N., Milani, G., Schioppo, M., Yoon, T. H., Ludlow, A. D.
Publikováno v:
Nature 564, 87-90 (2018)
The passage of time is tracked by counting oscillations of a frequency reference, such as Earth's revolutions or swings of a pendulum. By referencing atomic transitions, frequency (and thus time) can be measured more precisely than any other physical
Externí odkaz:
http://arxiv.org/abs/1807.11282
Autor:
Wcisło, P., Ablewski, P., Beloy, K., Bilicki, S., Bober, M., Brown, R., Fasano, R., Ciuryło, R., Hachisu, H., Ido, T., Lodewyck, J., Ludlow, A., McGrew, W., Morzyński, P., Nicolodi, D., Schioppo, M., Sekido, M., Targat, R. Le, Wolf, P., Zhang, X., Zjawin, B., Zawada, M.
Publikováno v:
Science Advances, 4, eaau4869 (2018)
We report on the first earth-scale quantum sensor network based on optical atomic clocks aimed at dark matter (DM) detection. Exploiting differences in the susceptibilities to the fine-structure constant of essential parts of an optical atomic clock,
Externí odkaz:
http://arxiv.org/abs/1806.04762
Autor:
Beloy, K., Zhang, X., McGrew, W. F., Hinkley, N., Yoon, T. H., Nicolodi, D., Fasano, R. J., Schäffer, S. A., Brown, R. C., Ludlow, A. D.
Publikováno v:
Phys. Rev. Lett. 120, 183201 (2018)
We demonstrate the absence of a DC Stark shift in an ytterbium optical lattice clock. Stray electric fields are suppressed through the introduction of an in-vacuum Faraday shield. Still, the effectiveness of the shielding must be experimentally asses
Externí odkaz:
http://arxiv.org/abs/1803.10737
Autor:
Brown, R. C., Phillips, N. B., Beloy, K., McGrew, W. F., Schioppo, M., Fasano, R. J., Milani, G., Zhang, X., Hinkley, N., Leopardi, H., Yoon, T. H., Nicolodi, D., Fortier, T. M., Ludlow, A. D.
Publikováno v:
Phys. Rev. Lett. 119, 253001 (2017)
Optical clocks benefit from tight atomic confinement enabling extended interrogation times as well as Doppler- and recoil-free operation. However, these benefits come at the cost of frequency shifts that, if not properly controlled, may degrade clock
Externí odkaz:
http://arxiv.org/abs/1708.08829