Double optical resonance

Whitley, R. M.; Stroud, C. R.

doi:10.1103/physreva.14.1498

Cited by 456 publications

(180 citation statements)

References 24 publications

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“…The dephasing is introduced phenomenologically by a decay rate Γ out of the three level system. This system is an analog of the excitation of an optical three level system and can be fully described by the according optical Bloch equations [21]. In the case of coherent couplings (Γ = 0), this system describes the dipole blockade as an analog to the Autler-Townes splitting in the optical system.…”

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confidence: 99%

Rabi Oscillations and Excitation Trapping in the Coherent Excitation of a Mesoscopic Frozen Rydberg Gas

et al. 2008

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We demonstrate the coherent excitation of a mesoscopic ensemble of about 100 ultracold atoms to Rydberg states by driving Rabi oscillations from the atomic ground state. We employ a dedicated beam shaping and optical pumping scheme to compensate for the small transition matrix element. We study the excitation in a weakly interacting regime and in the regime of strong interactions. When increasing the interaction strength by pair state resonances we observe an increased excitation rate through coupling to high angular momentum states. This effect is in contrast to the proposed and previously observed interaction-induced suppression of excitation, the so-called dipole blockade.PACS numbers: 03.65. Yz, 32.80.Pj, 32.80.Rm, 34.20.Cf, 34.60.+z Rydberg atoms, with their rich internal structure, have been in the focus of atomic physics for more than a century [1]. In the last decade Rydberg physics were extended to laser-cooled atomic gases which allowed the study of a frozen system with controllable, strong interactions and negligible thermal contributions. This has opened a wide field in both experiment and theory covering such diverse areas as resonant energy transfer [2,3], plasma formation [4,5], exotic molecules [6,7], and quantum random walks [8,9]. In addition, these frozen Rydberg systems have been proposed as a possible candidate for quantum information processing [10,11]. However, the coherent excitation of Rydberg atoms, an important prerequisite for quantum information protocols, has proven a challenging task. While Rabi oscillations between different Rydberg states have been demonstrated and thoroughly analyzed before [12], Rabi oscillations between the ground state and Rydberg states of atoms have not been observed directly so far, mainly owing to the small transition matrix element.In this Letter we report on the experimental realization and observation of Rabi oscillations between the ground and Rydberg states of ultracold atoms. We demonstrate how strong interatomic interactions influence the coherent excitation of a mesoscopic cloud of atoms. We show that an interaction-induced coupling to a larger number of internal states can be used to trap the excitation. Employed in a controlled way, this effect offers future applications in the experimental realization of quantum random walks with exciton trapping [9].Our experiments are performed with a magneto-optical trap (MOT) of about 10 7 87 Rb atoms at densities of 10 10 cm −3 and temperatures below 100 µK. Rydberg excitation is achieved with two counterpropagating laser beams at 780 nm and 480 nm (see Fig. 1). The laser at 780 nm is collimated to a waist of 1.1 mm ensuring a constant Rabi frequency of 2π × 55 MHz over the excitation volume as determined from Autler-Townes splittings [13]. The laser at 480 nm is referenced to a temperature stabilized Zerodur-resonator and its beam is shaped with a diffractive optical element that produces a flattop beam profile which is characterized with an adapted CCD camera with a spatial resolution of 5.6 µm. The m...

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Rabi Oscillations and Excitation Trapping in the Coherent Excitation of a Mesoscopic Frozen Rydberg Gas

et al. 2008

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“…To adequately describe this case requires the use of a full quantum electrodynamical theoretical treatment. Such a treatment was originally given by Ackerhalt et al (1973) and Ackerhalt and Eberly (1974) for a two-state atom and extended to a three-state, stepwise excitation scheme by Whitley and Stroud (1976). , Murray et al (1990) and Trajmar et al (1990) have extended the treatment to an arbitrary number of states.…”

Section: (B) the Heisenberg Operator Methodsmentioning

confidence: 99%

Applications of Lasers to Collision Studies

MacGillivray¹,

Standage

1990

Aust. J. Phys.

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“…Studies on coherent population trapping (CPT) and electromagnetically induced transparency (EIT) set the basis for many coherent control techniques based on combined detuned lasers and adiabatic transfer [10][11][12][13][14][15][16]. The * Electronic address: carles.serrat-jurado@upc.edu concept of CPT was employed to demonstrate pumping of atomic systems in a particular state, and has been theoretically analyzed by Arimondo and Orriols [11] and Gray et al [12] based on the solution of the Bloch-like equations of motion for a 3-level system with applications in Sodium atoms.…”

Section: Introductionmentioning

confidence: 99%

“…The * Electronic address: carles.serrat-jurado@upc.edu concept of CPT was employed to demonstrate pumping of atomic systems in a particular state, and has been theoretically analyzed by Arimondo and Orriols [11] and Gray et al [12] based on the solution of the Bloch-like equations of motion for a 3-level system with applications in Sodium atoms. This concept was further experimentally demonstrated by Whitley and Stroud [14]. The main goal of these studies was to optimally pump as much population as possible to the excited state from the ground state with the requirements of a proper combination of density matrix (DM) relaxation rates, Rabi frequencies and precise detuning of the laser field.…”

Section: Introductionmentioning

confidence: 99%

Control of rubidium low-lying Rydberg states with trichromatic femtosecond π pulses for ultrafast quantum information processing

2017

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We propose an ultrafast femtosecond time scale trichromatic π-pulse illumination scheme for coherent excitation and manipulation of low-lying Rydberg states in rubidium. Selective population of nP 3/2 levels with principal quantum numbers n 12 using 75 fs laser pulses is achieved. The density-matrix equations of a four-level ladder system beyond the rotating-wave approximation have to be solved to clarify the balance between the principal quantum numbers, the duration of the laser pulses and the associated ac-Stark effects for the fastest optimal excitation. The mechanism is robust for femtosecond control using different level configurations for applications in ultrafast quantum information processing and spectroscopy.

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Double optical resonance

Cited by 456 publications

References 24 publications

Rabi Oscillations and Excitation Trapping in the Coherent Excitation of a Mesoscopic Frozen Rydberg Gas

Rabi Oscillations and Excitation Trapping in the Coherent Excitation of a Mesoscopic Frozen Rydberg Gas

Applications of Lasers to Collision Studies

Control of rubidium low-lying Rydberg states with trichromatic femtosecond π pulses for ultrafast quantum information processing

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