Optical nonlinearity of Rydberg electromagnetically induced transparency in thermal vapor using the optical-heterodyne-detection technique

Bhowmick, Arup; Sahoo, Sushree S.; Mohapatra, Ashok K.

doi:10.1103/physreva.94.023839

Cited by 6 publications

(18 citation statements)

References 46 publications

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“…The ladder-type EIT takes advantage of the dramatic changes in the optical properties to achieve high-resolution Rydberg spectroscopy and to demonstrate a direct nondestructive optical detection of highly excited Rydberg states [34]. More complex phenomena were also studied taking noncoherent effects into account [35]. The Rydberg excitation in ladder-type three-level atoms using two optical fields includes two effects: two one-photon resonances (two-step) and two-photon coherent excitation.…”

Section: Theoretical Modelmentioning

confidence: 99%

Inverted-ladder-type optical excitation of potassium Rydberg states with hot and cold ensembles

et al. 2020

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We present experimental results on the sub-Doppler Rydberg spectroscopy of potassium in a hot cell and cold atoms, using two counterpropagating laser beams of 405 and 980 nm as an inverted ladder-type excitation configuration (4S 1/2-5P 3/2-nS 1/2 and nD 3/2,5/2). Such an inverted ladder-type scheme is predicted to be without the sub-Doppler electromagnetically induced transparency feature in a thermal ensemble under the weak-probe approximation. Instead, we utilize a strong probe field and successfully observe a transparency window with a width narrower than 50 MHz. Our all-order numerical simulation is in satisfactory agreement with the experimental results. This narrow linewidth allows us to measure the energy levels of the Rydberg levels from n = 20-70 with improved accuracy. The deduced ionization energy agrees with the previous measurements. Furthermore, the two-photon Rydberg excitation scheme was applied to the cold ensembles to study the ground-state atoms population decrease in the magneto-optical trap for various Rydberg states. Our experimental observations suggested two distinct regimes of the trap losses under different probe detuning conditions. While the far off-resonance case (p 0) can be described by the picture of dressed atom, the on-resonance case (p ∼ 0) reveals more interesting results. The higher Rydberg states suffer larger trap loss. Besides, even with similar level energies, the excitation to nD states result in faster escape of the ground-state atom from trap than nearby nS states.

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Section: Theoretical Modelmentioning

confidence: 99%

Inverted-ladder-type optical excitation of potassium Rydberg states with hot and cold ensembles

et al. 2020

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“…4(a) . Optical heterodyne detection technique (OHDT) 42 , 45 was used to measure the dispersion of the probe beam propagating through a magnetically shielded rubidium vapor cell. The details of the OHDT and the theoretical model for relating the dispersion with Rydberg population can be found in ref.…”

Section: Resultsmentioning

confidence: 99%

“…For the coupling laser the power was varied following the n 3/2 law, so as to keep the coupling rabi frequency constant for all the n states. The Rabi frequencies of the probe and coupling beams were determined from their intensity using the method discussed in ref 42 . The inhomogeneity of the laser intensity profile is neglected in the model and the averaged Rabi frequencies were used to compare with the experimental observation.…”

Section: Resultsmentioning

confidence: 99%

“…The above integral can be solved analytically to find the total number of atoms contributing to the anti-blockade as . Rydberg population can be related to the dispersion which is a measurable quantity using optical heterodyne detection technique as 42 . Averaging over the velocity distribution of the first atom, the dispersion of the probe due to anti-blockade can be evaluated as …”

Section: Methodsmentioning

confidence: 99%

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Rydberg interaction induced enhanced excitation in thermal atomic vapor

Kara

Bhowmick

Mohapatra

2018

Sci Rep

Self Cite

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We present the experimental demonstration of interaction induced enhancement in Rydberg excitation or Rydberg anti-blockade in thermal atomic vapor. We have used optical heterodyne detection technique to measure Rydberg population due to two-photon excitation to the Rydberg state. The anti-blockade peak which doesn’t satisfy the two-photon resonant condition is observed along with the usual two-photon resonant peak which can’t be explained using the model with non-interacting three-level atomic system. A model involving two interacting atoms is formulated for thermal atomic vapor using the dressed states of three-level atomic system to explain the experimental observations. A non-linear dependence of vapor density is observed for the anti-blockade peak which also increases with increase in principal quantum number of the Rydberg state. A good agreement is found between the experimental observations and the proposed interacting model. Our result implies possible applications towards quantum logic gates using Rydberg anti-blockade in thermal atomic vapor.

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Section: Theoretical Modelmentioning

confidence: 99%

Inverted Ladder Type Optical Excitation of Potassium Rydberg States with Hot and Cold Ensembles

Chen,

Chang,

Huang

et al. 2019

Preprint

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We present experimental results on the sub-Doppler Rydberg spectroscopy of potassium in a hot cell and cold atoms, performed with two counter-propagating laser beams of 405 nm and 980 nm in the inverted ladder-type system (4S 1/2 -5P 3/2 -nS 1/2 and nD 3/2,5/2 ). Such an inverted laddertype scheme is predicted to be without sub-Doppler electromagnetically induced transparency (EIT) feature in a thermal ensemble under the weak-probe approximation. Instead, we chose a strong probe field beyond the weak-probe approximation, and successfully observed a transparency window with a width narrower than 50 MHz. Our all-order numerical simulation is in satisfactory agreement with the experimental results. This narrow linewidth allows us to measure the energy levels of the Rydberg levels from n=20-70 with improved accuracy. The deduced ionization energy agrees with the previous measurements. Furthermore, on the cold ensemble, our experiment studied the mechanism of the trap loss induced by the two-photon Rydberg excitation. We found that the dephasing loss induced by the dipole-dipole interaction dominates the trap loss while the detuning from the intermediate state ∆p ∼0 and the Rydberg state is occupied. Such a loss of the D state is stronger than that of the S state, because of its non-spherical symmetry. And, for ∆p >0 and nearly no population on the Rydberg state, the perturbation from the excitation fields results in a reduction of trap efficiency.

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Optical nonlinearity of Rydberg electromagnetically induced transparency in thermal vapor using the optical-heterodyne-detection technique

Cited by 6 publications

References 46 publications

Inverted-ladder-type optical excitation of potassium Rydberg states with hot and cold ensembles

Inverted-ladder-type optical excitation of potassium Rydberg states with hot and cold ensembles

Rydberg interaction induced enhanced excitation in thermal atomic vapor

Inverted Ladder Type Optical Excitation of Potassium Rydberg States with Hot and Cold Ensembles

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