State-insensitive dichromatic optical-dipole trap for rubidium atoms: calculation and the dicromatic laser's realization

Wang, Junmin; Guo, Shanlong; Ge, Yulong; Cheng, Yongjie; Yang, Baodong; He, Jun

doi:10.1088/0953-4075/47/9/095001

Cited by 7 publications

(7 citation statements)

References 30 publications

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“…The trapping laser repopulates atoms into both ground states via scattering through D1 transition, however, this effect is slow and any population that does decay to dark ground state during the loading process is pumped with a re-pump laser back to |g prior to interrogation. The steady-state absorption of this four-level atomic system is modelled using the density matrix, ρ, which is governed by the Liouville equations [31,32] of the general form:…”

Section: Modellingmentioning

confidence: 99%

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Dual-Color Magic-Wavelength Trap for Suppression of Light Shifts in Atoms

et al. 2019

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We present an optical approach to compensating for spatially varying ac-Stark shifts that appear on atomic ensembles subject to strong optical control or trapping fields. The introduction of an additional weak light field produces an intentional perturbation between atomic states that is tuned to suppress the influence of the strong field. The compensation field suppresses sensitivity in one of the transition frequencies of the trapped atoms to both the atomic distribution and motion. We demonstrate this technique in a cold rubidium ensemble and show a reduction in inhomogeneous broadening in the trap. This two-colour approach emulates the magic trapping approach that is used in modern atomic lattice clocks but provides greater flexibility in choice of atomic species, probe transition, and trap wavelength.

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Section: Modellingmentioning

confidence: 99%

“…In other circumstances, it has been suggested that bichromatic traps might offer a solution [27][28][29]. Indeed, some calculated possibilities for Rb and Cs have been published [28][29][30]. Nonetheless, to our knowledge no-one has yet demonstrated a bichromatic magic trap for an optical transition.…”

Section: Introductionmentioning

confidence: 97%

Dual-Color Magic-Wavelength Trap for Suppression of Light Shifts in Atoms

et al. 2019

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“…Thus the transition frequency between the ground and the excited states are shifted. Taking the multilevel structure of the atom into account, the light shift for the atoms in a linearly polarized ODT is given by [18,25,26]:…”

Section: Experiments Results and Discussionmentioning

confidence: 99%

Measurement of magic-wavelength optical dipole trap by using the laser-induced fluorescence spectra of trapped single cesium atoms

Liu¹,

Jin²,

Sun³

et al. 2017

Opt. Express

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Based on the multi-level model, we have calculated light shifts for Zeeman states of hyperfine levels of cesium (Cs) 6S ground state and 6P excited state. The magic-wavelength linearly-polarized optical dipole trap (ODT) for Cs 6S |F = 4, m = + 4ñ - 6P |F = 5, m = + 5ñ transition is experimentally constructed and characterized by using the laser-induced fluorescence spectra of trapped single Cs atoms. The magic wavelength is 937.7 nm which produces almost the same light shift for 6S |F = 4, m = + 4ñ ground state and 6P |F = 5, m = + 5ñ excited state with linearly-polarized ODT laser beam. Compared to undisturbed Cs 6S |F = 4, m = + 4ñ - 6P |F = 5, m = + 5ñ transition frequency in free space, the differential light shift is less than 0.7 MHz in a linearly-polarized 937.7 nm ODT, which is less than 1.2% of the trap depth. We also discussed influence of the trap depth and the bias magnetic field on the measurement results.

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“…The calculation of the polarizability of 6S 1/2 state is similar to Ref. [23]. The dynamic polarizability of the 43S 1/2 state is given by The positions of the 43S 1/2 ↔ nP transitions are indicated by the arrow lines together with the corresponding nP labels in Fig.…”

Section: Magic Odt For Ground-state and Rydberg-state Cs Atomsmentioning

confidence: 97%

“…[20] and experimentally demonstrated in strong-coupling cavity quantum electrodynamics system [21] for applications in quantum measurement and precision metrology [22]. Previous studies on the magic-wavelength ODT of neutral atoms mainly focus on the transition from ground state to a low-excited state [21][22][23][24][25][26]. In 2005, a blue-detuned magic-wavelength bottle beam trap was proposed for trapping the 5S 1/2 ground state and 50D 5/2 Rydberg state of Rb atoms [27], and recently Barredo et al experimentally demonstrated the bottle beam trap for Rydberg-state Rb atoms [18].…”

Section: Introductionmentioning

confidence: 99%

Towards implementation of a magic optical-dipole trap for confining ground-state and Rydberg-state cesium cold atoms

Bai,

Liu,

et al. 2020

Preprint

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In most of the experiments involving confinement of ground-state atoms by using of an optical-dipole trap (ODT) and Rydberg excitation of the atoms, one has to switch off ODT during Rydberg excitation and coherent manipulation because Rydberg atoms normally cannot be confined in a conventional ODT. This yields the extremely low repetition rate of the experimental sequence, and the spatial diffusion of the atoms during the period of switching off ODT greatly restricts coherence of the system. For a red-detuned ODT formed by a focused single-spatial-mode Gaussian laser beam with a typical 1/e 2 beam waist diameter of several ten micrometers, we performed the calculation of ODT's magic detuning for confinement of cesium ground state and Rydberg state with the same potential well. We used a highprecision sum-over-states method to calculate the dynamic polarizabilities of the 6S 1/2 ground state and highly-excited (nS 1/2 and nP 3/2 ) Rydberg state of cesium atoms, and identify corresponding magic detuning for optical wavelengths in the range of 850 − 2000 nm. We estimated the trapping lifetime of cesium Rydberg atoms confined in the magic ODT by including different dissipative mechanisms. Furthermore, we have experimentally realized a 1879.43-nm single-frequency laser system with a wattlevel output power for setting up the magic ODT for 6S 1/2 ground-state and 84P 3/2 Rydberg-state cesium cold atoms. It is of great significance for implementing highfidelity quantum logic gates and other quantum information protocols involving highlyexcited Rydberg atoms in ODT.

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State-insensitive dichromatic optical-dipole trap for rubidium atoms: calculation and the dicromatic laser's realization

Cited by 7 publications

References 30 publications

Dual-Color Magic-Wavelength Trap for Suppression of Light Shifts in Atoms

Dual-Color Magic-Wavelength Trap for Suppression of Light Shifts in Atoms

Measurement of magic-wavelength optical dipole trap by using the laser-induced fluorescence spectra of trapped single cesium atoms

Towards implementation of a magic optical-dipole trap for confining ground-state and Rydberg-state cesium cold atoms

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