Zobrazeno 1 - 10
of 80
pro vyhledávání: '"HUME, D. B."'
Quantum algorithms such as dynamical decoupling can be used to improve the sensitivity of a quantum sensor to a signal while suppressing sensitivity to noise. Atomic clocks are among the most sensitive quantum sensors, with recent improvements in clo
Externí odkaz:
http://arxiv.org/abs/2302.12956
Autor:
Clements, E. R., Kim, M. E., Cui, K., Hankin, A. M., Brewer, S. M., Valencia, J., Chen, J. -S., Chou, C. W., Leibrandt, D. R., Hume, D. B.
Publikováno v:
Phys. Rev. Lett. 125, 243602 (2020)
Laser decoherence limits the stability of optical clocks by broadening the observable resonance linewidths and adding noise during the dead time between clock probes. Correlation spectroscopy avoids these limitations by measuring correlated atomic tr
Externí odkaz:
http://arxiv.org/abs/2007.02193
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:
Hankin, A. M., Clements, E. R., Huang, Y., Brewer, S. M., Chen, J. -S., Chou, C. W., Hume, D. B., Leibrandt, D. R.
Publikováno v:
Phys. Rev. A 100, 033419 (2019)
We describe a framework for calculating the frequency shift and uncertainty of trapped-ion optical atomic clocks caused by background-gas collisions, and apply this framework to an $^{27}$Al$^+$ clock to enable a total fractional systematic uncertain
Externí odkaz:
http://arxiv.org/abs/1902.08701
Autor:
Brewer, S. M., Chen, J. -S., Hankin, A. M., Clements, E. R., Chou, C. W., Wineland, D. J., Hume, D. B., Leibrandt, D. R.
Publikováno v:
Phys. Rev. Lett. 123, 033201 (2019)
We describe an optical atomic clock based on quantum-logic spectroscopy of the $^1$S$_0$ $\leftrightarrow$ $^3$P$_0$ transition in $^{27}$Al$^{+}$ with a systematic uncertainty of ${9.4 \times 10^{-19}}$ and a frequency stability of ${1.2\times10^{-1
Externí odkaz:
http://arxiv.org/abs/1902.07694
Publikováno v:
Phys. Rev. Lett. 118, 053002 (2017)
We report on Raman sideband cooling of ${^{25}\text{Mg}^+}$ to sympathetically cool the secular modes of motion in a $^{25}\text{Mg}^+$-$^{27}\!\text{Al}^+$ two-ion pair to near the three-dimensional (3D) ground state. The evolution of the Fock-state
Externí odkaz:
http://arxiv.org/abs/1608.05047
A major challenge in quantum metrology is the generation of entangled states with macroscopic atom number. Here, we demonstrate experimentally that atomic squeezing generated via non-linear dynamics in Bose Einstein condensates, combined with suitabl
Externí odkaz:
http://arxiv.org/abs/1405.6022
Publikováno v:
Phys. Rev. Lett. 111, 253001 (2013)
Many cold atom experiments rely on precise atom number detection, especially in the context of quantum-enhanced metrology where effects at the single particle level are important. Here, we investigate the limits of atom number counting via resonant f
Externí odkaz:
http://arxiv.org/abs/1307.7598
Publikováno v:
Phys. Rev. Lett. 107, 243902 (2011)
We demonstrate a general method for state detection of trapped ions that can be applied to a large class of atomic and molecular species. We couple a "spectroscopy" ion (Al+) to a "control" ion (Mg+) in the same trap and perform state detection throu
Externí odkaz:
http://arxiv.org/abs/1108.5922
We place two atoms in quantum superposition states and observe coherent phase evolution for 3.4x10^15 cycles. Correlation signals from the two atoms yield information about their relative phase even after the probe radiation has decohered. This techn
Externí odkaz:
http://arxiv.org/abs/1101.3766