Search for new physics with atoms and molecules

Safronova, M. S.; Budker, Dmitry; DeMille, David; Kimball, Derek F. Jackson; Derevianko, Andrei; Clark, Charles W.

doi:10.1103/revmodphys.90.025008

Cited by 1,366 publications

(1,182 citation statements)

References 1,007 publications

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“…Optical atomic clocks are currently the most precise and accurate absolute frequency references [1][2][3][4][5][6][7][8][9], while their microwave-domain counterparts are used to define the second [10,11] and for other practical applications, including communication and navigation [12,13]. Precision frequency metrology has also been proposed as a means of studying quantum many-body physics [14,15], searching for exotic physics [16][17][18], and exploring fundamental quantum limits imposed by gravity [19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Frequency Measurements of Superradiance from the Strontium Clock Transition

et al. 2018

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We present the first characterization of the spectral properties of superradiant light emitted from the ultranarrow, 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 6.7ð1Þ × 10 −16 at 1 s of averaging, establish absolute accuracy at the 2-Hz (4 × 10 −15 fractional frequency) level, and demonstrate insensitivity to key environmental perturbations.

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Section: Introductionmentioning

confidence: 99%

Frequency Measurements of Superradiance from the Strontium Clock Transition

et al. 2018

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“…A Fermi-degenerate three-dimensional optical lattice clock was demonstrated in [6], with a synchronous clock comparison between two regions of the 3D lattice yielding a measurement precision of 5 × 10 −19 in 1 hour of averaging time. Improved precision of the atomic clocks enables many applications, including relativistic geodesy [7], very long baseline interferometry [8], search for the variation of the fundamental constants [9] and dark matter [10,11], tests of the Lorentz invariance [12], redefinition of the second [13], and others. Further improvement of clock precision is needed for these applications and implementation of new ideas, such as the use of atomic clocks for the gravitational wave detection [14].…”

Section: Introductionmentioning

confidence: 99%

Multipolar Polarizabilities and Hyperpolarizabilities in the Sr Optical Lattice Clock

Porsev

Safronova

et al. 2018

Phys. Rev. Lett.

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We address the problem of the lattice Stark shifts in the Sr clock caused by the multipolar M 1 and E2 atom-field interactions and by the term nonlinear in lattice intensity and determined by the hyperpolarizability. We have developed an approach to calculate hyperpolarizabilities for atoms and ions based on a solution of the inhomogeneous equation which allows to effectively and accurately carry out complete summations over intermediate states. We applied our method to the calculation of the hyperpolarizabilities for the clock states in Sr. We also carried out an accurate calculation of the multipolar polarizabilities for these states at the magic frequency. Understanding these Stark shifts in optical lattice clocks is crucial for further improvement of the clock accuracy.

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“…Currently, extensive experimental efforts worldwide have been focused on the development of complementary techniques to perform high-precision measurements of IS in atomic transitions, across different isotopic chains [7][8][9][10]. Alongside the experimental progress, the development of many-body methods plays a central role in these studies as it provides the means to extract nuclear-structure and fundamental-physics parameters from experimental observations [11]. Reliable atomic calculations are critical to establish firm conclusions from highprecision experiments in nuclear [12] and fundamental-physics research [13].…”

Section: Introductionmentioning

confidence: 99%

Analytic response relativistic coupled-cluster theory: the first application to indium isotope shifts

et al. 2020

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With increasing demand for accurate calculation of isotope shifts of atomic systems for fundamental and nuclear structure research, an analytic energy derivative approach is presented in the relativistic coupled-cluster (CC) theory framework to determine the atomic field shift and mass shift (MS) factors. This approach allows the determination of expectation values of atomic operators, overcoming fundamental problems that are present in existing atomic physics methods, i.e. it satisfies the Hellmann-Feynman theorem, does not involve any non-terminating series, and is free from choice of any perturbative parameter. As a proof of concept, the developed analytic response relativistic CC theory has been applied to determine MS and field shift factors for different atomic states of indium. High-precision isotope-shift measurements of -104 127 In were performed in the 246.8 nm (5p 2 P 3/2  9s 2 S 1/2 ) and 246.0 nm (5p 2 P 1/2  8s 2 S 1/2 ) transitions to test our theoretical results. An excellent agreement between the theoretical and measured values is found, which is known to be challenging in multi-electron atoms. The calculated atomic factors allowed an accurate determination of the nuclear charge radii of the ground and isomeric states of the -104 127 In isotopes, providing an isotone-independent comparison of the absolute charge radii.

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Search for new physics with atoms and molecules

Cited by 1,366 publications

References 1,007 publications

Frequency Measurements of Superradiance from the Strontium Clock Transition

Frequency Measurements of Superradiance from the Strontium Clock Transition

Multipolar Polarizabilities and Hyperpolarizabilities in the Sr Optical Lattice Clock

Analytic response relativistic coupled-cluster theory: the first application to indium isotope shifts

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