Abstract This paper reviews recent efforts to realize a high‐efficiency memory for optical pulses using slow and stored light based on electromagnetically induced transparency (EIT) in ensembles of warm atoms vapor cells. After brief summary basic continuous‐wave dynamic EIT properties, studies weak classical signal optically dense coherent media are discussed, including optimization strategies efficiency pulse‐shape control, modification slow/stored spectral properties due atomic motion....

Abstract This tutorial introduces the theoretical and experimental basics of electromagnetically induced transparency (EIT) in thermal alkali vapors. We first give a brief phenomenological description EIT simple three-level systems stationary atoms derive analytical expressions for optical absorption dispersion under conditions. Then we focus on how motion affects various parameters system. Specifically, analyze Doppler broadening transitions, ballistic versus diffusive atomic limited-volume...

Abstract This article is designed as a step-by-step guide to optically pumped magnetometers based on alkali atomic vapor cells. We begin with general introduction magneto-optical response, well expected magnetometer performance merits and how they are affected by main sources of noise. followed brief comparison different realizations an overview current research, the aim helping readers identify most suitable type for specific applications. Next, we discuss some practical considerations...

We demonstrate experimentally a procedure to obtain the maximum efficiency for storage and retrieval of light pulses in atomic media. The uses time-reversal optimal input signal pulse shapes. Experimental results warm Rb vapor are good agreement with theoretical predictions substantial improvement efficiency. This optimization is applicable wide range systems.

We study procedures for the optimization of efficiency light storage and retrieval based on dynamic form electromagnetically induced transparency in hot Rb vapor. present a detailed analysis two recently demonstrated protocols: time-reversal-based iteration procedure, which finds optimal input signal pulse shape any given control field, procedure calculation an field shape. verify that are mutually consistent they both independently achieve maximum memory optical depth. observe good...

We present a joint theoretical and experimental characterization of the coherent population trapping (CPT) resonance excited on ${D}_{1}$ line $^{87}\mathrm{Rb}$ atoms by bichromatic linearly polarized laser light. observe high-contrast transmission resonances (up to $\ensuremath{\approx}25%$), which makes this excitation scheme promising for miniature all-optical atomic clock applications. also demonstrate cancellation first-order light shift proper choice frequencies relative intensities...

We study intensity distribution of transmission resonances under the conditions electromagnetically induced transparency (EIT) with lin||lin configuration in 87Rb vapor. demonstrate that for various orientations external magnetic field all seven resolved EIT exhibit maxima or minima at certain directions linear polarization laser field. This effect can be used development a high-precision vector magnetometer.

We report an experimental demonstration of anti-parity-time symmetric optical four-wave mixing in thermal rubidium vapor, where the propagation probe and stokes fields a double-Λ scheme is governed by non-Hermitian Hamiltonian. are particularly interested studying quantum intensity correlations between two near exceptional point, taking into account loss accompanied Langevin noise. Our measurements classical gain associated two-mode relative-intensity squeezing reasonable agreement with...

We propose a new method of resonant enhancement optical Kerr nonlinearity that uses multilevel atomic coherence. The is accompanied by suppression the other linear and nonlinear susceptibility terms medium. show effect results in modification Faraday rotation light propagating an 87Rb vapor cell changing ellipticity light.

Diffusion-induced Ramsey narrowing is characterized and identified as a general phenomenon, in which diffusion of coherence out an interaction region such laser beam induces spectral the associated resonance line shape. Illustrative experiments intuitive analytical model are presented for this effect, occurs commonly optically interrogated atomic systems may also be relevant to quantum dots other solid-state spin systems.

We experimentally demonstrate optimal storage and retrieval of light pulses arbitrary shape in atomic ensembles. By shaping auxiliary control pulses, we attain efficiencies approaching the fundamental limit achieve precise into any predetermined temporal profile. Our techniques, demonstrated warm Rb vapor, are applicable to a wide range systems protocols. As an example, present their potential application creation optical time-bin qubits controlled partial retrieval.

We study the modification of a traditional electromagnetically induced transparency (EIT) stored light technique that includes both EIT and four-wave mixing (FWM) in an ensemble hot Rb atoms. The standard treatment storage involves coherent reversible mapping one photonic mode onto collective spin coherence. It has been shown unwanted, competing processes such as are enhanced by can significantly modify signal optical pulse propagation. present theoretical experimental evidence to indicate...

We suggest a technique based on the transfer of topological charge from applied laser radiation to directional and coherent optical fields generated in ladder-type excited atomic media identify major processes responsible for their appearance. As an illustration, Rb vapours we analyse transverse intensity phase profiles forward-directed collimated blue near-IR light using self-interference astigmatic transformation techniques when either or both two resonant beams carry orbital angular...

We present a realization of magnetic sensor based on electromagnetically induced transparency (EIT) resonances observed in hot Rb vapor using lin∥lin polarized dichromatic light and evaluate scalar vector capabilities the for measuring Earth-like fields. demonstrate measurement sensitivity 2

We experimentally investigate four-wave mixing (FWM) in a diamond interaction scheme using 85 Rb vapor, and identify the optimal conditions for joint amplification relative intensity squeezing of two optical fields: one near D 1 transition ( λ = 794.6 nm) other telecom O-band 1324 nm). achieved reduction noise by up to 2.6 ± 0.4 dB compared with shot level, signifying non-classical quantum correlations. The observed level is primarily limited available pump laser power, which constrains...

We study the modifications of Rydberg EIT resonances in non-collinear geometry which two required optical fields cross at a small non-zero angle. observe strong broadening and amplitude reduction even for angles when compared to exact counter-propagating co-propagating collinear geometries. confirm that such peak deterioration results from additional Doppler due transverse velocity distribution atoms. The numerical simulation closely matches experimental measurements. While provides improved...

We show that the effective decay rate of Zeeman coherence, generated in a (87)Rb vapor by linearly polarized laser light, increases significantly with atomic density. explain this phenomenon as result radiation trapping. Our study shows trapping must be taken into account to fully understand many electromagnetically induced transparency experiments optically thick media.

When linearly polarized light propagates through a medium in which elliptically would undergo self-rotation, squeezed vacuum can appear the orthogonal polarization. A simple relationship between self-rotation and degree of squeezing is developed. Taking into account absorption, we find optimum conditions for any that produce self-rotation. We then analytic expressions amount produced by an atomic vapor when near-resonant with transition various low-angular-momentum states. Finally, consider...

We present preliminary results from an experimental study of slow light in anti-relaxation-coated Rb vapor cells, and describe the construction testing such cells. The ground state decoherence rate allowed by coated cell walls leads to a dual-structured electromagnetically induced transparency (EIT) spectrum with very narrow (<100 Hz) peak on top broad pedestal. Such dual-structure EIT permits optical probe pulses propagate greatly reduced group velocity two time scales. discuss ongoing...

We report on experimentally observed addition, subtraction, and cancellation of orbital angular momentum (OAM) in the process parametric four-wave mixing that results frequency up- down-converted emission Rb vapor. Specific features OAM transfer from resonant laser fields with different optical topological charges to spatially temporally coherent blue light (CBL) have been considered. conservation nonlinear wave a wide range experimental conditions, including noncollinear geometry applied...

We investigate the prospects of using two-mode intensity squeezed twin-beams, generated in Rb vapor, to improve sensitivity spectroscopic measurements by engaging two-photon Raman transitions. As a proof principle demonstration, we demonstrated quantum-enhanced $5D_{3/2}$ hyperfine structure with reduced requirements for pump laser power and vapor number density.

We utilize the generation of large atomic coherence to enhance resonant nonlinear magneto-optic effect by several orders magnitude, thereby eliminating power broadening and improving fundamental signal-to-noise ratio. A proof-of-principle experiment is carried out in a dense vapor Rb atoms. Detailed numerical calculations are good agreement with experimental results. Applications such as optical magnetometry or search for violations parity time reversal symmetry feasible.

We experimentally study the group time delay for a light pulse propagating through hot $^{87}\mathrm{Rb}$ vapor in presence of strong coupling field $\ensuremath{\Lambda}$ configuration. demonstrate that ultraslow propagation is transformed into superluminal as one-photon detuning increases due to change transmission resonance line shape. Negative velocity low $\ensuremath{-}c∕{10}^{6}=\ensuremath{-}80\phantom{\rule{0.3em}{0ex}}\mathrm{m}∕\mathrm{s}$ recorded. also find advance regime grows...