Combined chips for atom optics

Günther, Andreas; Kemmler, M.; Kraft, Sebastian; Vale, Chris; Zimmermann, C.; Fortágh, József

doi:10.1103/physreva.71.063619

Cited by 66 publications

(63 citation statements)

References 22 publications

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“…Since the advent of microchip traps for cold atoms [1][2][3][4][5][6][7][8][9][10][11][12], interest in developing quantum hybrid systems, which exploit the long coherence times of Bose-Einstein condensates with the flexibility of modern micro-and nanoelectronics, continues to grow. There is potential to use such systems as quantum memory devices [13][14][15], precision measurement devices [16][17][18][19] and even rewritable electronic systems [20].…”

Section: Introductionmentioning

confidence: 99%

Evaporative cooling of cold atoms at surfaces

et al. 2014

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We theoretically investigate the evaporative cooling of cold rubidium atoms that are brought close to a solid surface. The dynamics of the atom cloud are described by coupling a dissipative GrossPitaevskii equation for the condensate with a quantum Boltzmann description of the thermal cloud (the Zaremba-Nikuni-Griffin method). We have also performed experiments to allow for a detailed comparison with this model and find that it can capture the key physics of this system provided the full collisional dynamics of the thermal cloud are included. In addition, we suggest how to optimize surface cooling to obtain the purest and largest condensates.

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Section: Introductionmentioning

confidence: 99%

Evaporative cooling of cold atoms at surfaces

et al. 2014

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“…So far, experiments have dealt with atoms prepared in the electronic ground state, due to their intrinsic stability. Despite their weak interactions, ground-state atoms on atom chips have been used to sensitively probe the intrinsic thermal noise near surfaces [3][4][5], map magnetic and electric field distributions [6][7][8][9][10][11], and investigate the Casimir-Polder potential in the micrometer range [12][13][14]. Comparatively, atoms excited to high-lying Rydberg states have extremely large transition dipole moments (scaling with n 2 ) resulting in long-range interactions and have large electric polarizabilities (∝ n 7 ) which can greatly enhance both atomatom and atom-surface interactions.…”

Section: Introductionmentioning

confidence: 99%

Spatially resolved excitation of Rydberg atoms and surface effects on an atom chip

et al. 2010

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General rightsIt is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s) and/or copyright holder(s), other than for strictly personal, individual use, unless the work is under an open content license (like Creative Commons). Disclaimer/Complaints regulationsIf you believe that digital publication of certain material infringes any of your rights or (privacy) interests, please let the Library know, stating your reasons. In case of a legitimate complaint, the Library will make the material inaccessible and/or remove it from the website. Please Ask the Library: http://uba.uva.nl/en/contact, or a letter to: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam, The Netherlands. You will be contacted as soon as possible. We demonstrate spatially resolved, coherent excitation of Rydberg atoms on an atom chip. Electromagnetically induced transparency (EIT) is used to investigate the properties of the Rydberg atoms near the gold-coated chip surface. We measure distance-dependent shifts (∼10 MHz) of the Rydberg energy levels caused by a spatially inhomogeneous electric field. The measured field strength and distance dependence is in agreement with a simple model for the electric field produced by a localized patch of Rb adsorbates deposited on the chip surface during experiments. The EIT resonances remain narrow (<4 MHz) and the observed widths are independent of atom-surface distance down to ∼20 µm, indicating relatively long lifetime of the Rydberg states. Our results open the way to studies of dipolar physics, collective excitations, quantum metrology, and quantum information processing involving interacting Rydberg excited atoms on atom chips.

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“…Typically, 3 · 10 8 Rubidium atoms from a magnetooptical trap are transferred into a standard magnetic trap and precooled by forced evaporation to a temperature of 5µK. Next, the atoms are adiabatically shifted into a micro trap transport system that allows to generate a harmonic trapping potential at an arbitrary position within a volume of 1.5 x 0.3 x 20 mm 3 (x, y, zdirection) [13]. The transport system consists of an assembly of 100µm wide gold conductors electroplated on both sides of a 250µm thick substrate ("carrier chip").…”

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confidence: 99%

“…A Bose-Einstein condensate consisting of 1.2 · 10 5 87 Rb atoms in the F=2, m F =2 hyperfine state is trapped in an elongated magnetic trap close to the surface of a chip that carries a magnetic lattice [13]. It consists of a set of 372 parallel conductors perpendicular to the long axes of the trap, each 1µm wide and separated by 1µm gaps [14].…”

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confidence: 99%

Diffraction of a Bose-Einstein Condensate from a Magnetic Lattice on a Microchip

et al. 2005

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We experimentally study the diffraction of a Bose-Einstein condensate from a magnetic lattice, realized by a set of 372 parallel gold conductors which are micro fabricated on a silicon substrate. The conductors generate a periodic potential for the atoms with a lattice constant of 4µm. After exposing the condensate to the lattice for several milliseconds we observe diffraction up to 5 th order by standard time of flight imaging techniques. The experimental data can be quantitatively interpreted with a simple phase imprinting model. The demonstrated diffraction grating offers promising perspectives for the construction of an integrated atom interferometer.

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Combined chips for atom optics

Cited by 66 publications

References 22 publications

Evaporative cooling of cold atoms at surfaces

Evaporative cooling of cold atoms at surfaces

Spatially resolved excitation of Rydberg atoms and surface effects on an atom chip

Diffraction of a Bose-Einstein Condensate from a Magnetic Lattice on a Microchip

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