Compact Gravimeter with Spin-Squeezed Atoms in Optical Lattices

Atomic interferometry in optical lattices is a new trend for developing a practical quantum gravimeter. Here, we propose a compact and portable gravimetry scheme with an ensemble of ultracold atoms in gravitationally tilted spin-dependent optical lattices. The fast coherent separation and recombination of atoms can be realized via polarization-synthesized optical lattices. The input atomic wave packet is coherently split into two parts by a spin-dependent shift and a subsequent $\frac{\ensuremath{\pi}}{2}$ pulse. Then the two parts are held for accumulating a relative phase related to the gravity. Lastly the two parts are recombined for interference by a $\frac{\ensuremath{\pi}}{2}$ pulse and a subsequent spin-dependent shift. The $\frac{\ensuremath{\pi}}{2}$ pulses not only preclude the spin-dependent energies in the accumulated phase, but also avoid the error sources, such as dislocation of optical lattices in the holding process. In addition, we develop an analytical method for the sensitivity in multipath interferometry.Atomic interferometry in optical lattices is a new trend for developing a practical quantum gravimeter. Here, we propose a compact and portable gravimetry scheme with an ensemble of ultracold atoms in gravitationally tilted spin-dependent optical lattices. The fast coherent separation and recombination of atoms can be realized via polarization-synthesized optical lattices. The input atomic wave packet is coherently split into two parts by a spin-dependent shift and a subsequent $\frac{\ensuremath{\pi}}{2}$ pulse. Then the two parts are held for accumulating a relative phase related to the gravity. Lastly the two parts are recombined for interference by a $\frac{\ensuremath{\pi}}{2}$ pulse and a subsequent spin-dependent shift. The $\frac{\ensuremath{\pi}}{2}$ pulses not only preclude the spin-dependent energies in the accumulated phase, but also avoid the error sources, such as dislocation of optical lattices in the holding process. In addition, we develop an analytical method for the sensitivity in multipath interferometry.

arXiv:1804.10376Physical Review ANov 19, 201812 citations

Spin-spin interaction and squeezing in optical lattices

Anders Søndberg Sørensen, Klaus Mølmer

Jan 1, 19990 citations

Coherent control of atomic motion in an optical lattice for precise measurements of gravity

Marco G. Tarallo, Andrea Alberti, N. Poli +3 more

Bulletin of the American Physical SocietyJun 17, 20110 citations

Compact atomic gravimeter based on a pulsed and accelerated optical lattice

M. Andia, Raphaël Jannin, F. Nez +3 more

We present a scheme of a compact atomic gravimeter based on atom interferometry. Atoms are maintained against gravity using a sequence of coherent accelerations performed by the Bloch oscillations technique. We demonstrate a sensitivity of $4.8\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}8}$ with an integration time of 4 min. Combining this method with an atomic elevator allows us to measure the local gravity at different positions in the vacuum chamber. This method can be of relevance to improve the measurement of the Newtonian gravitational constant $G$ .We present a scheme of a compact atomic gravimeter based on atom interferometry. Atoms are maintained against gravity using a sequence of coherent accelerations performed by the Bloch oscillations technique. We demonstrate a sensitivity of $4.8\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}8}$ with an integration time of 4 min. Combining this method with an atomic elevator allows us to measure the local gravity at different positions in the vacuum chamber. This method can be of relevance to improve the measurement of the Newtonian gravitational constant $G$.

arXiv:1309.1713Physical Review ASep 25, 201345 citations

Atomic gravimeter robust to environmental effects

Cristian Daniel Panda, Matt Tao, Miguel Ceja +2 more

Atomic accelerometers and gravimeters are usually based on freely falling atoms in atomic fountains, which not only limits their size but also their robustness to environmental factors, such as tilts, magnetic fields, and vibrations. Such limitations have precluded their broad adoption in the field, for geophysics, geology, and inertial navigation. More recently, atom interferometers based on holding atoms in an optical lattice have been developed. Such gravimeters also suppress the influence of vibrations in the frequency range of ∼1 Hz and above by several orders of magnitude relative to conventional atomic gravimeters. Here, we show that such interferometers are robust to tilts of more than 8 mrad with respect to the vertical and can suppress the effect of even strong environmental magnetic fields and field gradients by using atoms in the F=3, 4 hyperfine ground states as co-magnetometers, potentially eliminating the need for shielding. We demonstrate gravimeter sensitivity of 0.7 mGal/Hz (1 mGal = 10 μm/s2) in a compact geometry where atoms only travel over millimeters of space.Atomic accelerometers and gravimeters are usually based on freely falling atoms in atomic fountains, which not only limits their size but also their robustness to environmental factors, such as tilts, magnetic fields, and vibrations. Such limitations have precluded their broad adoption in the field, for geophysics, geology, and inertial navigation. More recently, atom interferometers based on holding atoms in an optical lattice have been developed. Such gravimeters also suppress the influence of vibrations in the frequency range of ∼1 Hz and above by several orders of magnitude relative to conventional atomic gravimeters. Here, we show that such interferometers are robust to tilts of more than 8 mrad with respect to the vertical and can suppress the effect of even strong environmental magnetic fields and field gradients by using atoms in the F=3, 4 hyperfine ground states as co-magnetometers, potentially eliminating the need for shielding. We demonstrate gravimeter sensitivity of 0.7 mGal/Hz (1 mGal = 10 μm/s2) in a compact geometry where atoms only travel over millimeters of space.

arXiv:2305.05555Applied Physics LettersAug 7, 202312 citations

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