arXiv:1004.3727 · Physical Review A

Light storage in a magnetically dressed optical lattice

Yaroslav O. Dudin, Ran Zhao, T. A. B. Kennedy, A. Kuzmich

Published Apr 29, 2010• 50 citations

Abstract

Differential Stark shift compensation for ground-state $^{87}\mathrm{Rb}$ atoms trapped in an elliptically polarized optical lattice and ``magic'' magnetic field was recently proposed and demonstrated experimentally by N. Lundblad et al. [e-print arXiv:0912.1528] and analyzed theoretically by A. Derevianko [e-print arXiv:0912.3233]. Here we demonstrate enhanced hyperfine coherence times using the magic field technique. We observe coherent light storage with a $0.32$-s lifetime in an atomic Rb gas confined in a one-dimensional optical lattice and magnetic field.

DOI: 10.1103/physreva.81.041805

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Publisher’s Note: Light storage in a magnetically dressed optical lattice [Phys. Rev. APLRAAN1050-294710.1103/PhysRevA.81.04180581, 041805 (2010)]

Yaroslav O. Dudin, R. Zhao, T. A. B. Kennedy +1 more

with incorrect text on page 1.On page 1, right-hand column, the last sentence of the second paragraph should read as "By comparing results for the three distinct coherences, we establish residual magnetic sensitivity of the approach as a major limiting factor on the observed storage lifetimes, and identify differential vector and rank-2 tensor ac-Stark contributions to the measured magnetic field values.".

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arXiv:1004.3727 · Physical Review A

Light storage in a magnetically dressed optical lattice

Yaroslav O. Dudin, Ran Zhao, T. A. B. Kennedy, A. Kuzmich

Published Apr 29, 2010• 50 citations

arXiv HTML PDF

Abstract

Differential Stark shift compensation for ground-state

^{87}\mathrm{Rb}

atoms trapped in an elliptically polarized optical lattice and ``magic'' magnetic field was recently proposed and demonstrated experimentally by N. Lundblad et al. [e-print arXiv:0912.1528] and analyzed theoretically by A. Derevianko [e-print arXiv:0912.3233]. Here we demonstrate enhanced hyperfine coherence times using the magic field technique. We observe coherent light storage with a

0.32

-s lifetime in an atomic Rb gas confined in a one-dimensional optical lattice and magnetic field.

DOI: 10.1103/physreva.81.041805

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Light storage on the minute scale is an important capability for future scalable quantum information networks spanning intercontinental distances. We employ an ultracold atomic gas confined in a one-dimensional optical lattice for long-term light storage. The differential ac Stark shift of the ground-level microwave transition used for storage is reduced to a sub-Hz level by the application of a magic-valued magnetic field. The $1/e$ lifetime for storage of coherent states of light is prolonged up to 16 s by a microwave dynamic decoupling protocol.Light storage on the minute scale is an important capability for future scalable quantum information networks spanning intercontinental distances. We employ an ultracold atomic gas confined in a one-dimensional optical lattice for long-term light storage. The differential ac Stark shift of the ground-level microwave transition used for storage is reduced to a sub-Hz level by the application of a magic-valued magnetic field. The $1/e$ lifetime for storage of coherent states of light is prolonged up to 16 s by a microwave dynamic decoupling protocol.

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Experimental observation of magic-wavelength behavior of Rb87 atoms in an optical lattice

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We demonstrate the cancellation of the differential ac Stark shift of the microwave hyperfine clock transition in trapped $^{87}\mathrm{Rb}$ atoms. Recent progress in metrology exploits so-called magic wavelengths, whereby an atomic ensemble can be trapped with laser light whose wavelength is chosen so that both levels of an optical atomic transition experience identical ac Stark shifts. Similar magic-wavelength techniques are not possible for the microwave hyperfine transitions in the alkali metals due to their simple electronic structure. We show, however, that ac Stark shift cancellation is indeed achievable for certain values of wavelength, polarization, and magnetic field. The cancellation comes at the expense of a small magnetic-field sensitivity. The technique demonstrated here has implications for experiments involving the precise control of optically trapped neutral atoms.We demonstrate the cancellation of the differential ac Stark shift of the microwave hyperfine clock transition in trapped $^{87}\mathrm{Rb}$ atoms. Recent progress in metrology exploits so-called magic wavelengths, whereby an atomic ensemble can be trapped with laser light whose wavelength is chosen so that both levels of an optical atomic transition experience identical ac Stark shifts. Similar magic-wavelength techniques are not possible for the microwave hyperfine transitions in the alkali metals due to their simple electronic structure. We show, however, that ac Stark shift cancellation is indeed achievable for certain values of wavelength, polarization, and magnetic field. The cancellation comes at the expense of a small magnetic-field sensitivity. The technique demonstrated here has implications for experiments involving the precise control of optically trapped neutral atoms.

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In this paper, we have demonstrated that optically generated fictitious magnetic fields can be utilized to extend the lifetime of quantum memories in cold atomic ensembles. All the degrees of freedom of an AC Stark shift, such as polarization, spatial profile, and temporal waveform, can be readily controlled in a precise manner. Temporal fluctuations over several experimental cycles and spatial inhomogeneities along a cold atomic gas have been compensated by an optical beam. The advantage of employing fictitious magnetic fields for quantum storage lies in the speed and spatial precision with which these fields can be synthesized. Our simple and versatile technique can find widespread application in coherent pulse and single-photon storage across various atomic species. Published by the American Physical Society 2024In this paper, we have demonstrated that optically generated fictitious magnetic fields can be utilized to extend the lifetime of quantum memories in cold atomic ensembles. All the degrees of freedom of an AC Stark shift, such as polarization, spatial profile, and temporal waveform, can be readily controlled in a precise manner. Temporal fluctuations over several experimental cycles and spatial inhomogeneities along a cold atomic gas have been compensated by an optical beam. The advantage of employing fictitious magnetic fields for quantum storage lies in the speed and spatial precision with which these fields can be synthesized. Our simple and versatile technique can find widespread application in coherent pulse and single-photon storage across various atomic species. Published by the American Physical Society 2024

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Publisher’s Note: Light storage in a magnetically dressed optical lattice [Phys. Rev. APLRAAN1050-294710.1103/PhysRevA.81.04180581, 041805 (2010)]

Yaroslav O. Dudin, R. Zhao, T. A. B. Kennedy +1 more

Physical Review AMay 12, 20101 citation

Differential Stark shift compensation for ground-state

^{87}\mathrm{Rb}

0.32

-s lifetime in an atomic Rb gas confined in a one-dimensional optical lattice and magnetic field.

1/e

lifetime for storage of coherent states of light is prolonged up to 16 s by a microwave dynamic decoupling protocol.

We demonstrate the cancellation of the differential ac Stark shift of the microwave hyperfine clock transition in trapped

^{87}\mathrm{Rb}

atoms. Recent progress in metrology exploits so-called magic wavelengths, whereby an atomic ensemble can be trapped with laser light whose wavelength is chosen so that both levels of an optical atomic transition experience identical ac Stark shifts. Similar magic-wavelength techniques are not possible for the microwave hyperfine transitions in the alkali metals due to their simple electronic structure. We show, however, that ac Stark shift cancellation is indeed achievable for certain values of wavelength, polarization, and magnetic field. The cancellation comes at the expense of a small magnetic-field sensitivity. The technique demonstrated here has implications for experiments involving the precise control of optically trapped neutral atoms.

^{7}\mathrm{Li}

to observe $0.59\ifmmode\pm\else\textpm\fi{}0.02\text{ }\text{ }\mathrm{Hz}$ linewidth with interrogation time of 2 s and $0.82\ifmmode\pm\else\textpm\fi{}0.06\text{ }\text{ }\mathrm{s}$ coherence time of a superposition state. Implications of the narrow linewidth and the long coherence time for precision spectroscopy and quantum information processing using atoms in an optical lattice are discussed.