Zobrazeno 1 - 10
of 715
pro vyhledávání: '"Brown, R. C. A."'
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:
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:
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
Autor:
Schioppo, M., Brown, R. C., McGrew, W. F., Hinkley, N., Fasano, R. J., Beloy, K., Yoon, T. H., Milani, G., Nicolodi, D., Sherman, J. A., Phillips, N. B., Oates, C. W., Ludlow, A. D.
Publikováno v:
Nature Photonics 11, 48-52 (2017)
Atomic clocks based on optical transitions are the most stable, and therefore precise, timekeepers available. These clocks operate by alternating intervals of atomic interrogation with dead time required for quantum state preparation and readout. Thi
Externí odkaz:
http://arxiv.org/abs/1607.06867
Autor:
Goldschmidt, E. A., Boulier, T., Brown, R. C., Koller, S. B., Young, J. T., Gorshkov, A. V., Rolston, S. L., Porto, J. V.
Publikováno v:
Phys. Rev. Lett. 116, 113001 (2016)
We observe interaction-induced broadening of the two-photon 5s-18s transition in 87Rb atoms trapped in a 3D optical lattice. The measured linewidth increases by nearly two orders of magnitude with increasing atomic density and excitation strength, wi
Externí odkaz:
http://arxiv.org/abs/1510.08710
Autor:
Goldschmidt, E. A., Norris, D. G., Koller, S. B., Wyllie, R., Brown, R. C., Porto, J. V., Safronova, U. I., Safronova, M. S.
Magic wavelengths, for which there is no differential ac Stark shift for the ground and excited state of the atom, allow trapping of excited Rydberg atoms without broadening the optical transition. This is an important tool for implementing quantum g
Externí odkaz:
http://arxiv.org/abs/1503.02881
Publikováno v:
Rev. Sci. Instrum. 84, 096101 (2013)
We present two complementary designs of pneumatically actuated and kinematically positioned optics mounts: one designed for vertical mounting and translation, the other designed for horizontal mounting and translation. The design and measured stabili
Externí odkaz:
http://arxiv.org/abs/1412.8565
Publikováno v:
Science, Vol. 348, pp. 540-544 (2015)
The competition of magnetic exchange interactions and tunneling underlies many complex quantum phenomena observed in real materials. We study non-equilibrium magnetization dynamics in an extended 2D system by loading effective spin-1/2 bosons into a
Externí odkaz:
http://arxiv.org/abs/1411.7036