The Experts below are selected from a list of 9444 Experts worldwide ranked by ideXlab platform

G M Tino - One of the best experts on this subject based on the ideXlab platform.

  • Sr atom interferometry with the optical Clock Transition as a gravimeter and a gravity gradiometer
    Classical and Quantum Gravity, 2019
    Co-Authors: Enlong Wang, G M Tino, Leonardo Salvi, Jonathan N. Tinsley, N Poli
    Abstract:

    We characterize the performance of a gravimeter and a gravity gradiometer based on the 1S0-3P0 Clock Transition of strontium atoms. We use this new quantum sensor to measure the gravitational acceleration with a relative sensitivity of 1.7×10-5, representing the first realisation of an atomic interferometry gravimeter based on a single-photon Transition. Various noise contributions to the gravimeter are measured and characterized, with the current primary limitation to sensitivity seen to be the intrinsic noise of the interferometry laser itself. In a gravity gradiometer configuration, a differential phase sensitivity of 1.53 rad/√Hz was achieved at an artificially introduced differential phase of π/2 rad. We experimentally investigated the effects of the contrast and visibility based on various parameters and achieve a total interferometry time of 30~ms, which is longer than previously reported for such interferometers. The characterization and determined limitations of the present apparatus employing 88Sr atoms provides a guidance for the future development of large-scale Clock-Transition gravimeters and gravity gradiometers with alkali-earth and alkali-earth-like atoms (e.g., 87Sr, Ca, Yb).

  • Sr atom interferometry with the optical Clock Transition as a gravimeter and a gravity gradiometer
    arXiv: Atomic Physics, 2019
    Co-Authors: Enlong Wang, G M Tino, Leonardo Salvi, Jonathan N. Tinsley, N Poli
    Abstract:

    We characterize the performance of a gravimeter and a gravity gradiometer based on the $^{1}$S$_{0}$-$^3$P$_0$ Clock Transition of strontium atoms. We use this new quantum sensor to measure the gravitational acceleration with a relative sensitivity of $1.7\times10^{-5}$, representing the first realisation of an atomic interferometry gravimeter based on a single-photon Transition. Various noise contributions to the gravimeter are measured and characterized, with the current primary limitation to sensitivity seen to be the intrinsic noise of the interferometry laser itself. In a gravity gradiometer configuration, a differential phase sensitivity of 1.53~rad/$\sqrt{Hz}$ was achieved at an artificially introduced differential phase of $\pi/2$~rad. We experimentally investigated the effects of the contrast and visibility based on various parameters and achieve a total interferometry time of 30~ms, which is longer than previously reported for such interferometers. The characterization and determined limitations of the present apparatus employing $^{88}$Sr atoms provides a guidance for the future development of large-scale Clock-Transition gravimeters and gravity gradiometers with alkali-earth and alkali-earth-like atoms (e.g., $^{87}$Sr, Ca, Yb).

  • Characterization of the gravity gradiometer based on the Sr optical Clock Transition
    2018 European Frequency and Time Forum (EFTF), 2018
    Co-Authors: Leonardo Salvi, G M Tino, Enlong Wang, N Poli
    Abstract:

    We present a gravity gradiometer with the strontium optical Clock Transition by integrating a double lattice launch technique to develop two atomic samples vertically and a new method to add an artificial phase shift between two samples. We experimentally characterize the launch performance and the robustness of adding the artificial phase shift. The tunable differential phase shift is particularly important for characterizing the performance of a gravity gradiometer when the separation of the two clouds is limited by the geometrical constraints. Moreover, numerical simulation results indicate that the systematic error of the differential phase measurement can be largely reduced when the ellipse phase approaches ±π/2 rad by simply tuning the relative phase between two RF signals.

  • atom interferometry with the sr optical Clock Transition
    Physical Review Letters, 2017
    Co-Authors: N Poli, Leonardo Salvi, G M Tino
    Abstract:

    A single-photon interaction atom interferometer is demonstrated using the ultra-narrow optical Clock Transition of strontium atoms.

  • Atom Interferometry with the Sr Optical Clock Transition.
    Physical review letters, 2017
    Co-Authors: N Poli, Leonardo Salvi, G M Tino
    Abstract:

    We report on the realization of a matter-wave interferometer based on single-photon interaction on the ultranarrow optical Clock Transition of strontium atoms. We experimentally demonstrate its operation as a gravimeter and as a gravity gradiometer. No reduction of interferometric contrast was observed for a total interferometer time up to ∼10  ms, limited by geometric constraints of the apparatus. Single-photon interferometers represent a new class of high-precision sensors that could be used for the detection of gravitational waves in so far unexplored frequency ranges and to enlighten the boundary between quantum mechanics and general relativity.

N Poli - One of the best experts on this subject based on the ideXlab platform.

  • Sr atom interferometry with the optical Clock Transition as a gravimeter and a gravity gradiometer
    Classical and Quantum Gravity, 2019
    Co-Authors: Enlong Wang, G M Tino, Leonardo Salvi, Jonathan N. Tinsley, N Poli
    Abstract:

    We characterize the performance of a gravimeter and a gravity gradiometer based on the 1S0-3P0 Clock Transition of strontium atoms. We use this new quantum sensor to measure the gravitational acceleration with a relative sensitivity of 1.7×10-5, representing the first realisation of an atomic interferometry gravimeter based on a single-photon Transition. Various noise contributions to the gravimeter are measured and characterized, with the current primary limitation to sensitivity seen to be the intrinsic noise of the interferometry laser itself. In a gravity gradiometer configuration, a differential phase sensitivity of 1.53 rad/√Hz was achieved at an artificially introduced differential phase of π/2 rad. We experimentally investigated the effects of the contrast and visibility based on various parameters and achieve a total interferometry time of 30~ms, which is longer than previously reported for such interferometers. The characterization and determined limitations of the present apparatus employing 88Sr atoms provides a guidance for the future development of large-scale Clock-Transition gravimeters and gravity gradiometers with alkali-earth and alkali-earth-like atoms (e.g., 87Sr, Ca, Yb).

  • Sr atom interferometry with the optical Clock Transition as a gravimeter and a gravity gradiometer
    arXiv: Atomic Physics, 2019
    Co-Authors: Enlong Wang, G M Tino, Leonardo Salvi, Jonathan N. Tinsley, N Poli
    Abstract:

    We characterize the performance of a gravimeter and a gravity gradiometer based on the $^{1}$S$_{0}$-$^3$P$_0$ Clock Transition of strontium atoms. We use this new quantum sensor to measure the gravitational acceleration with a relative sensitivity of $1.7\times10^{-5}$, representing the first realisation of an atomic interferometry gravimeter based on a single-photon Transition. Various noise contributions to the gravimeter are measured and characterized, with the current primary limitation to sensitivity seen to be the intrinsic noise of the interferometry laser itself. In a gravity gradiometer configuration, a differential phase sensitivity of 1.53~rad/$\sqrt{Hz}$ was achieved at an artificially introduced differential phase of $\pi/2$~rad. We experimentally investigated the effects of the contrast and visibility based on various parameters and achieve a total interferometry time of 30~ms, which is longer than previously reported for such interferometers. The characterization and determined limitations of the present apparatus employing $^{88}$Sr atoms provides a guidance for the future development of large-scale Clock-Transition gravimeters and gravity gradiometers with alkali-earth and alkali-earth-like atoms (e.g., $^{87}$Sr, Ca, Yb).

  • Characterization of the gravity gradiometer based on the Sr optical Clock Transition
    2018 European Frequency and Time Forum (EFTF), 2018
    Co-Authors: Leonardo Salvi, G M Tino, Enlong Wang, N Poli
    Abstract:

    We present a gravity gradiometer with the strontium optical Clock Transition by integrating a double lattice launch technique to develop two atomic samples vertically and a new method to add an artificial phase shift between two samples. We experimentally characterize the launch performance and the robustness of adding the artificial phase shift. The tunable differential phase shift is particularly important for characterizing the performance of a gravity gradiometer when the separation of the two clouds is limited by the geometrical constraints. Moreover, numerical simulation results indicate that the systematic error of the differential phase measurement can be largely reduced when the ellipse phase approaches ±π/2 rad by simply tuning the relative phase between two RF signals.

  • atom interferometry with the sr optical Clock Transition
    Physical Review Letters, 2017
    Co-Authors: N Poli, Leonardo Salvi, G M Tino
    Abstract:

    A single-photon interaction atom interferometer is demonstrated using the ultra-narrow optical Clock Transition of strontium atoms.

  • Atom Interferometry with the Sr Optical Clock Transition.
    Physical review letters, 2017
    Co-Authors: N Poli, Leonardo Salvi, G M Tino
    Abstract:

    We report on the realization of a matter-wave interferometer based on single-photon interaction on the ultranarrow optical Clock Transition of strontium atoms. We experimentally demonstrate its operation as a gravimeter and as a gravity gradiometer. No reduction of interferometric contrast was observed for a total interferometer time up to ∼10  ms, limited by geometric constraints of the apparatus. Single-photon interferometers represent a new class of high-precision sensors that could be used for the detection of gravitational waves in so far unexplored frequency ranges and to enlighten the boundary between quantum mechanics and general relativity.

Scott A Diddams - One of the best experts on this subject based on the ideXlab platform.

  • The absolute frequency of the 87 Sr optical Clock Transition
    Metrologia, 2008
    Co-Authors: Gretchen K. Campbell, Andrew D. Ludlow, Martin M. Boyd, Tanya Zelevinsky, Sebastian Blatt, Jan Thomsen, Michael J. Martin, Marcio H. G. De Miranda, Scott A Diddams
    Abstract:

    The absolute frequency of the 1 S0– 3 P0 Clock Transition of 87 Sr has been measured to be 429 228 004 229 873.65 (37) Hz using lattice-confined atoms, where the fractional uncertainty of 8.6 × 10 −16 represents one of the most accurate measurements of an atomic Transition frequency to date. After a detailed study of systematic effects, which reduced the total systematic uncertainty of the Sr lattice Clock to 1.5 × 10 −16 , the Clock frequency is measured against a hydrogen maser which is simultaneously calibrated to the US primary frequency standard, the NIST Cs fountain Clock, NIST-F1. The comparison is made possible using a femtosecond laser based optical frequency comb to phase coherently connect the optical and microwave spectral regions and by a 3.5 km fibre transfer scheme to compare the remotely located Clock signals. (Some figures in this article are in colour only in the electronic version)

  • observation of the 1s0 3p0 Clock Transition in 27al
    Physical Review Letters, 2007
    Co-Authors: T Rosenband, P O Schmidt, D B Hume, W M Itano, Tara M Fortier, J E Stalnaker, Kyoungwhan Kim, Scott A Diddams, J C J Koelemeij, J C Bergquist
    Abstract:

    We report, for the first time, laser spectroscopy of the 1S0-->3P0 Clock Transition in 27Al+. A single aluminum ion and a single beryllium ion are simultaneously confined in a linear Paul trap, coupled by their mutual Coulomb repulsion. This coupling allows the beryllium ion to sympathetically cool the aluminum ion and also enables transfer of the aluminum's electronic state to the beryllium's hyperfine state, which can be measured with high fidelity. These techniques are applied to measure the Clock Transition frequency nu=1,121,015,393,207,851(6) Hz. They are also used to measure the lifetime of the metastable Clock state tau=20.6+/-1.4 s, the ground state 1S0 g factor gS=-0.000,792,48(14), and the excited state 3P0 g factor gP=-0.001,976,86(21), in units of the Bohr magneton.

  • Observation of the {sup 1}S{sub 0}{yields}{sup 3}P{sub 0} Clock Transition in {sup 27}Al{sup +}
    Physical review letters, 2007
    Co-Authors: T Rosenband, P O Schmidt, D B Hume, W M Itano, Kyoungwhan Kim, Scott A Diddams, J C J Koelemeij, J C Bergquist, Jason Stalnaker, D. J. Wineland
    Abstract:

    We report, for the first time, laser spectroscopy of the {sup 1}S{sub 0}{yields}{sup 3}P{sub 0} Clock Transition in {sup 27}Al{sup +}. A single aluminum ion and a single beryllium ion are simultaneously confined in a linear Paul trap, coupled by their mutual Coulomb repulsion. This coupling allows the beryllium ion to sympathetically cool the aluminum ion and also enables transfer of the aluminum's electronic state to the beryllium's hyperfine state, which can be measured with high fidelity. These techniques are applied to measure the Clock Transition frequency {nu}=1 121 015 393 207 851(6) Hz. They are also used to measure the lifetime of the metastable Clock state {tau}=20.6{+-}1.4 s, the ground state {sup 1}S{sub 0} g factor g{sub S}=-0.000 792 48(14), and the excited state {sup 3}P{sub 0} g factor g{sub P}=-0.001 976 86(21), in units of the Bohr magneton.

  • Stable Laser System for Probing the Clock Transition at 578 nm in Neutral Ytterbium
    2007 IEEE International Frequency Control Symposium Joint with the 21st European Frequency and Time Forum, 2007
    Co-Authors: Christopher W. Oates, Scott A Diddams, Z. W. Barber, Jason Stalnaker, Chad Hoyt, T. M. Fortier, Leo W. Hollberg
    Abstract:

    We describe a new laser system we have developed to probe the ultra-narrow 1S0 harr 3P0 Clock Transition at 578 nm in neutral ytterbium. The yellow light is produced by sum frequency generation in a periodically poled waveguide. With approximately 100 mW each from a fiber laser and Nd:YAG laser, we produce 10 mW of visible light. Stabilization of the laser to a resonance of a high finesse, environmentally isolated cavity has enabled resolution of spectroscopic features as narrow as 5 Hz.

  • Absolute frequency measurements of the /sup 1/S/sub 0/-/sup 3/P/sub 0/ optical Clock Transition at 578 nm in neutral Yb
    Digest of the LEOS Summer Topical Meetings 2005., 1
    Co-Authors: Christopher W. Oates, Tara M Fortier, Scott A Diddams, Chad Hoyt, Zeb W. Barber, Leo W. Hollberg
    Abstract:

    This work has focused on two atoms, Sr and Yb, due in part to the relatively high abundance of their odd isotopes, the use of which is necessary for appreciable direct excitation probability. The Sr Clock Transition has been measured (with an uncertainty of 20 kHz) using atoms in a magneto-optic trap (MOT), and has been excited with atoms confined in a one dimensional lattice. Here we report direct excitation of the Yb Clock Transition (at 578 nm) with atoms in a second-stage MOT, and the first fs-laser comb-based absolute measurements of the Clock frequency for two different isotopes. These measurements lead to a nearly millionfold improvement in our knowledge of the Transition frequencies, an important step toward Doppler-free spectroscopy of Yb atoms in a lattice.

James K. Thompson - One of the best experts on this subject based on the ideXlab platform.

  • frequency measurements of superradiance from the strontium Clock Transition
    Physical Review X, 2018
    Co-Authors: Matthew A. Norcia, Julia R. K. Cline, Juan A Muniz, John Robinson, Ross Hutson, Akihisa Goban, Edward G Marti, James K. Thompson
    Abstract:

    The frequency stability of superradiant light emitted from an optical Clock Transition in cold strontium atoms surpasses that of active microwave atomic Clocks, paving the way for a next generation of high-precision optical frequency references to be used outside the laboratory environment.

  • Frequency Measurements of Superradiance from the Strontium Clock Transition
    Physical Review X, 2018
    Co-Authors: Matthew A. Norcia, Julia R. K. Cline, Juan A Muniz, John Robinson, Ross Hutson, Akihisa Goban, G. Edward Marti, James K. Thompson
    Abstract:

    We present the first characterization of the spectral properties of superradiant light emitted from the ultra-narrow, 1 mHz linewidth optical Clock Transition in an ensemble of cold $^{87}$Sr atoms. Such a light source has been proposed as a next-generation active atomic frequency reference, with the potential to enable high-precision optical frequency references to be used outside laboratory environments. By comparing the frequency of our superradiant source to that of a state-of-the-art cavity-stabilized laser and optical lattice Clock, we observe a fractional Allan deviation of $6.7(1)\times 10^{-16}$ at 1 second of averaging, establish absolute accuracy at the 2 Hz ($4\times 10^{-15}$ fractional frequency) level, and demonstrate insensitivity to key environmental perturbations.

  • Superradiance on the millihertz linewidth strontium Clock Transition.
    Science advances, 2016
    Co-Authors: Matthew A. Norcia, Matthew Winchester, Julia R. K. Cline, James K. Thompson
    Abstract:

    Laser frequency noise contributes a significant limitation to today’s best atomic Clocks. A proposed solution to this problem is to create a superradiant laser using an optical Clock Transition as its gain medium. This laser would act as an active atomic Clock and would be highly immune to the fluctuations in reference cavity length that limit today’s best lasers. We demonstrate and characterize superradiant emission from the millihertz linewidth Clock Transition in an ensemble of laser-cooled 87Sr atoms trapped within a high-finesse optical cavity. We measure a collective enhancement of the emission rate into the cavity mode by a factor of more than 10,000 compared to independently radiating atoms. We also demonstrate a method for seeding superradiant emission and observe interference between two independent Transitions lasing simultaneously. We use this interference to characterize the relative spectral properties of the two lasing subensembles.

  • Superradiance on the milliHertz linewidth strontium Clock Transition
    arXiv: Atomic Physics, 2016
    Co-Authors: Matthew A. Norcia, Matthew Winchester, Julia R. K. Cline, James K. Thompson
    Abstract:

    Today's best atomic Clocks are limited by frequency noise on the lasers used to interrogate the atoms. A proposed solution to this problem is to create a superradiant laser using an optical Clock Transition as its gain medium. This laser would act as an active atomic Clock, and would be highly immune to the fluctuations in reference cavity length that limit today's best lasers. Here, we demonstrate and characterize superradiant emission from the mHz linewidth Clock Transition in an ensemble of laser-cooled $^{87}$Sr atoms trapped within a high-finesse optical cavity. We measure a collective enhancement of the emission rate into the cavity mode by a factor of more than 10,000 compared to independently radiating atoms. We also demonstrate a method for seeding superradiant emission and observe interference between two independent Transitions lasing simultaneously. We use this interference to characterize the relative spectral properties of the two lasing sub-ensembles.

Andrei Derevianko - One of the best experts on this subject based on the ideXlab platform.