Topic
Atomic coherence
About: Atomic coherence is a research topic. Over the lifetime, 877 publications have been published within this topic receiving 29395 citations.
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TL;DR: In this paper, the effect of coherent population trapping may result in resonant enhancement of higher-order nonlinearities, accompanied by suppression of other linear and nonlinear susceptibility terms.
Abstract: We show that the effect of coherent population trapping may result in resonant enhancement of ${\ensuremath{\chi}}^{(5)}$ or higher-order nonlinearities. The enhancement is accompanied by suppression of the other linear and nonlinear susceptibility terms. This effect has promise for a realistic scheme of photon phase gates necessary for practical implementation of quantum processing protocols.
60 citations
TL;DR: In this article, the authors report experimental storage and retrieval of weak coherent states of light at telecommunication wavelengths using erbium ions doped into a solid, using two photon-echo-based quantum storage protocols.
Abstract: We report experimental storage and retrieval of weak coherent states of light at telecommunication wavelengths using erbium ions doped into a solid. We use two photon-echo-based quantum storage protocols. The first one is based on controlled reversible inhomogeneous broadening (CRIB). It allows the retrieval of the light on demand by controlling the collective atomic coherence with an external electric field, via the linear Stark effect. We study how atoms in the excited state affect the signal-to-noise ratio of the CRIB memory. Additionally we show how CRIB can be used to modify the temporal width of the retrieved light pulse. The second protocol is based on atomic frequency combs. Using this protocol we verify that the reversible mapping is phase preserving by performing an interference experiment with a local oscillator. These measurements are enabling steps toward solid-state quantum memories at telecommunication wavelengths. We also give an outlook on possible improvements.
60 citations
TL;DR: In this article, a Tavis-Cummings model was used to characterize the velocity-dependent dynamics of the atoms as well as the dependency on the cavity detuning, and the authors experimentally and theoretically characterized the lasing threshold and evolution of such a system.
Abstract: Highly stable laser sources based on narrow atomic transitions provide a promising platform for direct generation of stable and accurate optical frequencies. Here we investigate a simple system operating in the high-temperature regime of cold atoms. The interaction between a thermal ensemble of $^{88}\mathrm{Sr}$ at mK temperatures and a medium-finesse cavity produces strong collective coupling and facilitates high atomic coherence, which causes lasing on the dipole forbidden $^{1}S_{0}\ensuremath{\leftrightarrow}^{3}P_{1}$ transition. We experimentally and theoretically characterize the lasing threshold and evolution of such a system and investigate decoherence effects in an unconfined ensemble. We model the system using a Tavis-Cummings model and characterize the velocity-dependent dynamics of the atoms as well as the dependency on the cavity detuning.
59 citations
TL;DR: This paper reveals that most previous results for the ladder-type EIT include the DROP effect, and can observe the double structure transmittance spectrum, a narrow spectrum due to the EIT and a broad spectrum in the 5S1/2(F=2)-5P3/2 (F'=3)-5D5/2
Abstract: We present the double resonance optical pumping (DROP) effect of ladder-type electromagnetically induced transparency (EIT) in the 5S1/2- 5P3/2-5D5/2 transition of 87Rb atoms. When many atoms of the ladder-type atomic system are simultaneously resonant with the two laser fields, the population of one ground state can be optically pumped into another ground state through intermediate states and excited states. In this paper, we reveal that most previous results for the ladder-type EIT include the DROP effect. When the probe laser is very weak and the coupling laser is strong, we can observe the double structure transmittance spectrum, a narrow spectrum due to the EIT and a broad spectrum due to the DROP, in the 5S1/2(F=2)- 5P3/2(F’=3)-5D5/2(F”=4) cycling transition.
59 citations
TL;DR: It is found that the frequency measurement of the emitted light localizes the atom in half-wavelength domain and the probability of finding the atom at a particular position can reach 100% when a photon with certain frequency is detected.
Abstract: We propose a scheme for two-dimensional (2D) atom localization based on the controlled spontaneous emission, in which the atom interacts with two orthogonal standing-wave fields. Due to the spatially dependent atom-field interaction, the position probability distribution of the atom can be directly determined by measuring the resulting spontaneously emission spectrum. The phase sensitive property of the atomic system leads to quenching of the spontaneous emission in some regions of the standing-waves, which significantly reduces the uncertainty in the position measurement of the atom. We find that the frequency measurement of the emitted light localizes the atom in half-wavelength domain. Especially the probability of finding the atom at a particular position can reach 100% when a photon with certain frequency is detected. By increasing the Rabi frequencies of the driving fields, such 2D sub-half-wavelength atom localization can acquire high spatial resolution.
58 citations