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electromagnetically induced transparency and quadripartite macroscopic entanglement generated in a ring cavity

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Chinese Physics B 2013年第2期22卷 255-260页

作者：马永红周玲 School of Physics and Optoelectronics Engineering Dalian University of Technology School of Mathematics Physics and Biological EngineeringInner Mongolia University of Science and Technology

We propose a feasible scheme to generate electromagnetically induced transparency（EIT） and quadripartite macroscopic entanglement in an optomechanical system with one fixed mirror and three movable perfectly reflecting *** explore the EIT phenomena in this optomechanical *** show the appearance of EIT dips in the output ***,we demonstrate how steady-state quadripartite entanglement can be generated via radiation *** also quantify the bipartite entanglement in each field-mirror subsystem and in the mirror-mirror *** show that a high intensity of entanglement between two subsystems can be achieved.

关键词： electromagnetically induced transparency optomechanical system quadripartite macroscopic entanglement

electromagnetically induced transparency in a three-mode optomechanical system

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Chinese Physics B 2014年第11期23卷 315-319页

作者：严晓波谷开慧付长宝崔淬砺吴金辉 College of Physics Jilin University College of Electronic Science Northeast Petroleum University

We study a three-mode double-cavity optomechanical system in which an oscillating membrane of perfect reflection is inserted between two fixed mirrors of partial transmission. We find that electromagnetically induced transparency （EIT） can be realized and controlled in this optomechanical system by adjusting the relative intensity and the relative phase between left-hand and right-hand input （probe and coupling） fields. In particular, one perfect EIT window is seen to occur when the two probe fields are exactly out of phase and the EIT window＇s width is very sensitive to the relative intensity of two coupling fields. Our numerical findings may be extended to achieve optomechanical storage and switching schemes applicable in quantum information processing.

关键词： cavity optomechanics electromagnetically induced transparency radiation pressure coupling in-tensity and phase control

electromagnetically induced transparency and Absorption of A Monochromatic Light Controlled by a Radio Frequency Field

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Communications in Theoretical Physics 2015年第2期63卷 229-235页

作者：蔡勋明 College of Information Engineering Guizhou Minzu University

electromagnetically induced transparency and absorption of a monochromatic light controlled by a radio frequency field in the cold multi-Zeeman-sublevel atoms are theoretically investigated. These Zeeman sublevels are coupled by a radio frequency （RF） field. Both electrom^gnetically induced transparency and electromagnetically induced absorption can be obtained by tuning the frequency of RF field for both the linear polarization and elliptical polarization monochromatic lights. When the transfer of coherence via spontaneous emission from the excited state to the ground state is considered, electromagnetically induced absorption can be changed into electromagnetically induced transparency with the change of intensity of radio field. The transparency windows controlled by the RF field can have potential applications in the magnetic-field measurement and quantum information processing.

关键词： electromagnetically induced transparency electromagnetically induced absorption absorption spectrum

electromagnetically induced transparency in a Zeeman-sublevels Λ-system of cold ^87Rb atoms in free space

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Chinese Physics B 2016年第3期25卷 200-204页

作者：蒋小军张海潮王育竹 Key Laboratory for Quantum Optics and Center for Cold Atom Physics of Chinese Academy of Sciences Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai 201800 China University of Chinese Academy of Sciences Beijing 100049 China

We report the experimental investigation of electromagnetically induced transparency （EIT） in a Zeeman-sublevels A-type system of cold 87Rb atoms in free space. We use the Zeeman substates of the hyperfine energy states 52 S 1/2, F =- 2 and 52P3/2, F1 = 2 of 87Rb D2 line to form a A-type EIT scheme. The EIT signal is obtained by scanning the probe light over 1 MHz in 4 ms with an 80 MHz arbitrary waveform generator. More than 97% transparency and 100 kHz EIT window are observed. This EIT scheme is suited for an application of pulsed coherent storage atom clock （Yan B, et al. 2009 Phys. Rev. A 79 063820）.

关键词： electromagnetically induced transparency Zeeman-sublevels cold atoms

electromagnetically induced transparency of single Λ-type three-level atoms in a high-finesse optical cavity

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Chinese Physics B 2013年第3期22卷 158-162页

作者：孙燕芬谭磊徐岩 Department of Physics L liang University Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education Lanzhou University College of Science Shandong University of Science and Technology

We study the features of electromagnetically induced transparency（EIT） in a single Λ-type three-level atom placed in a high-finesse cavity under the action of a coupling laser and a probe *** calculations show that three transparency windows appear when the pump strength is large *** can be explained by the residual pump in the cavity mostly resulting in energy *** level ｜3 is split into four slightly different energy levels,and interference takes place between the excitation ***,it is also shown that the frequencies of the EIT windows can be tuned by changing the coupling field detuning 2,and that the reflection profile is very sensitive to the cavity field detuning △c.

关键词： Λ-type three-level atom high-finesse optical cavity electromagnetically induced transparency

electromagnetically induced transparency in an Atom-Molecule Bose-Einstein Condensate

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Communications in Theoretical Physics 2007年第3X期48卷 461-464页

作者： JIN Guang-Ri Chul Koo Kim Kyun Nahm Institute of Physics and Applied Physics Yonsei University Seoul 120-749 Korea Department of Physics Yonsei University Wonju 220-710 Korea

We propose a new measurement scheme for the atom-molecule dark state by using electromagnetically induced transparency （FIT） technique. Based on a density-matrix formalism, we calculate the absorption coefficient numerically. The appearance of the EIT dip in the spectra profile gives clear evidence for the creation of the dark state in the atom-molecule Bose--Einstein condensate.

关键词： electromagnetically induced transparency dark state Bose-Einsteln condensate

electromagnetically induced transparency via localized surface plasmon mode-assisted hybrid cavity QED

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Chinese Physics B 2023年第11期32卷 456-464页

作者：李晓苗刘发民李子更朱虹燕王帆钟晓岚 School of Physics Beihang UniversityBeijing 100191China

In recent years, most studies have focused on the perfect absorption and high-efficiency quantum memory of the onesided system, ignoring the characteristics of its optical switching contrast. Thus, the performance of all-optical switching and optical transistors is limited. Herein, we propose a localized surface plasmon(LSP) mode-assisted cavity QED system which consists of a Λ-shaped three-level quantum emitter(QE), a metal nanoparticle and a one-sided optical cavity with a fully reflected mirror. In this system, the QE coherently couples to the cavity and LSP mode respectively, which is manipulated by the control field. As a result, considerably high and stable switch contrast of 90% can be achievable due to the strong confined field of the LSP mode and perfect absorption of the optical medium. In addition, we obtain a power dependent effect between the control field and the transmitted frequency as a result of the converted dark state. We employ the Heisenberg–Langevin equation and numerical master equation formalisms to explain high switching, controllable output light and the dark state. Our system introduces an effective method to improve the performance of optical switches based on the one-sided system in quantum information storage and quantum communication.

关键词： quantum optics electromagnetically induced transparency all-optical switching localized surface plasmon

Monte Carlo simulations of electromagnetically induced transparency in a square lattice of Rydberg atoms

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Chinese Physics B 2021年第7期30卷 283-288页

作者： Shang-Yu Zhai Jin-Hui Wu Center for Quantum Sciences Northeast Normal UniversityChangchun 130117China School of Physics Northeast Normal UniversityChangchun 130024China

We study the steady optical response of a square lattice in which all trapped atoms are driven by a probe and a coupling fields into the ladder configuration of electromagnetically induced transparency(EIT).It turns out to be a manybody problem in the presence of van der Waals(vd W)interaction among atoms in the upmost Rydberg state,so Monte Carlo(MC)calculation based on density matrix equations have been done after introducing a sufficiently large cut-off *** is found that the absorption and dispersion of EIT spectra depends critically on a few key parameters like lattice dimension,unitary vd W shift,probe Rabi frequency,and coupling *** modulating these parameters,it is viable to change symmetries of the absorption and dispersion spectra and control on demand depth and position of the transparency *** MC calculation is expected to be instructive in understanding many-body quantum coherence effects and in manipulating non-equilibrium quantum phenomena by utilizing vd W interactions of Rydberg atoms.

关键词： electromagnetically induced transparency Rydberg atomic lattices Monte Carlo simulations

Transient electromagnetically induced transparency spectroscopy of^(87)Rb atoms in buffer gas

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Chinese Physics B 2022年第7期31卷 235-240页

作者： Zi-Shan Xu Han-Mu Wang Zeng-Li Ba Hong-Ping Liu State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics Wuhan Institute of Physics and MathematicsInnovation Academy for Precision Measurement Science and TechnologyChinese Academy of SciencesWuhan 430071China University of Chinese Academy of Sciences Beijing 100049China School of Physical Science University of Science and Technology of ChinaHefei 230026China

We study the transient response dynamics of^(87)Rb atomic vapor buffered in 8 torr Ne gas through an electromagnetically induced transparency configured inΛ-***,the temporal transmission spectra versus probe detuning by switching on and off the coupling one show complex *** transmitted probe light intensity drops to a minimum value when the coupling light turns off,showing a strong *** at the moment of turning on the coupling light at a subsequent delayed time,the atomic medium shows a fast transient *** account for the transient switching feature,in the time-dependent optical Bloch equation,we must take the transverse relaxation dephasing process of atomic vapor into account,as well as the fluorescence relaxation along with the optical *** work supplies a technique to quantify the transverse relaxation time scale and to sensitively monitor its variation along the environment by observing the transient dynamics of coherent medium,which is helpful in characterizing the coherent feature of the atomic medium.

关键词： electromagnetically induced transparency rubidium atom transverse relaxation rate