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Experimental study of the dependences of retrieval efficiencies on time delay between magneto-optical-trap being turned off and optical storage

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Chinese Physics B 2016年第2期25卷 175-180页

作者：陈力荣徐忠孝李萍温亚飞曾炜卿武跃龙田龙李淑静王海 The State Key of quantum optics and quantum optics Devices Institute of Opto-Electronics Shanxi University

We report an experimental study of electromagnetically induced transparency（EIT）-based light storage in a cloud of cold atoms loaded into a magneto-optical-trap（MOT）. After the MOT is turned off, the retrieval efficiencies of rightand left-circularly polarized signal light fields each as a function of storage time are measured for different time delays between MOT off and the storage event, respectively. The results show that in the delay ranging from 0.015 ms to 3.5 ms,the retrieval efficiency for a zero-storage time（0.2 μs） and the storage lifetime can exceed 15% and 1.4 ms, *** measured results will provide important help for optimizing the storage of the polarized entanglement photons in cold atomic ensembles.

关键词： light storage electromagnetically induced transparency cold atomic ensemble experimental rep-etition rate

Coherent effect of triple-resonant optical parametric amplification inside a cavity with injection of a squeezed vacuum field

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Chinese Physics B 2013年第9期22卷 421-426页

作者：邸克张靖 State Key Laboratory of quantum optics and quantum optics Devices Institute of Opto-ElectronicsShanxi University

In theory, we study the quantum tluctuatlons ot tlae suDllarmonlc renecteu nela Irom a ulplc-rc^ulltUtt IdU^ClIClatC optical parametric amplifier （OPA） inside an optical cavity. We discuss two cases, where the linewidth of the harmonic field is either much narrower or broader than the subharmonic field. Since an electromagnetically-induced-transparency （EIT）-like effect can be simulated in a triple-resonant OPA, the output spectra from a triple-resonant OPA with a squeezed vacuum input may simulate the phenomenon of the response of an EIT medium for squeezed states. This scheme can be implemented with present experimental setups.

关键词： triple-resonant optical parametric amplification electromagnetically-induced-transparency (EIT)-like effect squeezed vacuum field

A compact Einstein–Podolsky–Rosen entangled light source

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Chinese Physics B 2015年第7期24卷 92-97页

作者：王雅君杨文海郑耀辉彭堃墀 State Key Laboratory of quantum optics and quantum optics Devices Institute of Opto-ElectronicsShanxi University

We present a stable entangled light source that integrates the pump laser, entanglement generator, detectors, and electronic control systems. By optimizing the design of the mechanical elements and the optical path, the size of the source is minimized, and the quantum correlations over 6 d B can be directly provided by the entangled source. The compact and stable entangled light source is suitable for practical applications in quantum information science and technology. The presented protocol provides a useful reference for manufacturing products of bright entangled light sources.

关键词： compact entangled light source Bell-state detection

Feshbach resonances in an ultracold mixture of 87Rb and 40K

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Chinese Physics B 2011年第10期20卷 198-203页

作者：王鹏军付正坤柴世杰张靖 State Key Laboratory of quantum optics and quantum optics Devices Institute of Opto-Electronics Shanxi University

We report the experimental preparations of the absolute ground states of 87Rb and 40K atoms （｜F = 1, mF = 1 ）＋｜F = 9/2, rnF ： -9/2）） by means of the radio-frequency and microwave adiabatic rapid passages, and the observation of magnetic Feshbach resonances in an ultracold mixture of bosonic STRb and fermionic 40K atoms between 0 T and 6.0 × 10^-2 T, including 7 homonuclear and 4 heteronuclear Feshbach resonances. The resonances are identified by the abrupt trap loss of atoms induced by the strong inelastic three-body collisions. These Feshbach resonances should enable the experimental control of interspecies interactions.

关键词： adiabatic rapid passages homonuclear Feshbach resonance heteronuclear Feshbach res-onances

Measurement of intensity difference squeezing via non-degenerate four-wave mixing process in an atomic vapor

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Chinese Physics B 2013年第9期22卷 415-420页

作者：于旭东孟增明张靖 State Key Laboratory of quantum optics and quantum optics Devices Institute of Opto-ElectronicsShanxi University

We report the measurement of the intensity difference squeezing via the non-degenerate four-wave mixing process in a rubidium atomic vapor medium. Two pairs of balanced detection systems are employed to measure the probe and the conjugate beams, respectively. It is convenient to get the quantum shot noise limit, the squeezed and the amplified noise power spectra. We also investigate the influence of the input extra quadrature amplitude noise of the probe beam. The influence of the extra noise can be minimized and the squeezing can be optimized under the proper parameter condition. We measure the -3.7-dB intensity difference squeezing when the probe beam has a 3-dB extra quadrature amplitude noise. This result is slightly smaller than -4.1 dB when the ideal coherent light （no extra noise） for the probe beam is used.

关键词： four-wave mixing process intensity difference squeezing self-balanced detection

The difference in noise property between the Autler-Townes splitting medium and the electromagnetically induced transparent medium

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Chinese Physics B 2012年第3期21卷 222-227页

作者：李中华李媛豆亚芳张俊香 State Key Laboratory of quantum optics and quantum optics Devices Institute of Opto-ElectronicsShanxi University

The quantum noise of squeezed probe light passing through an atomic system with different electromagnetically induced transparency and AutlewTownes splitting effects is investigated theoretically. It is found that the optimal squeezing preservation of the outgoing probe beam occurs in the strong-coupling-field regime rather than in the weak- coupling-field regime. In the weak-coupling-field regime, which was recently recognized as the electromagnetically induced transparency regime （Abi-Salloum T Y 2010 Phys. Rev. A 81 053836）, the output amplitude noise is affected mainly by the atomic noise originating from the random decay process of atoms. While in the strong-coupling-field regime, defined as the Autler-Townes splitting regime, the output amplitude noise is affected mainly by the phase-to- amplitude conversion noise. This is useful in improving the quality of the experiment for efficient quantum memory, and hence has an application in quantum information processing.

关键词： Autler Townes splitting electromagnetically induced transparency quantum noise

Experimental investigation of evaporative cooling mixture of bosonic ^(87)Rb and fermionic ^(40)K atoms with microwave and radio frequency radiation

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Chinese Physics B 2011年第1期20卷 515-520页

作者：王鹏军熊德智付正坤张靖 State Key Laboratory of quantum optics and quantum optics Devices Institute of Opto-ElectronicsShanxi University

We investigate sympathetic cooling fermions 40K by evaporatively cooling bosonic 87Rb atoms in a magnetic trap with microwave and radio frequency induced evaporations in detail. The mixture of bosonic and fermionic atoms is prepared in their polarized spin states IF = 9/2, mF = 9/2） for 40K and IF = 2, mF=2〉 for 87Rb, which is trapped in Quadrupole-Ioffe-Configuration trap. Comparing microwave with radio frequency evaporatively cooling bosonic STRb atoms with sympathetically cooling Fermi gas 40K, we find that the presence of rubidium atoms in the [2, 1} Zeeman states, which are generated in the evaporative process, gives rise to a significant loss of 40K due to inelastic collisions. Thus, the rubidium atoms populated in the [2, 1} Zeeman states should be removed in order to effectively perform sympathetically cooling 40K with the evaporatively cooled STRb atoms.

关键词： microwave and radio frequency induced evaporation sympathetically cooling inelasticcollisions

Autler-Townes doublet in the absorption spectra for the transition between excited states of cold cesium atoms

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Chinese Physics B 2010年第11期19卷 301-306页

作者：梁强兵杨保东杨建峰张天才王军民 State Key Laboratory of quantum optics and quantum optics Devices and Institute of Opto-ElectronicsShanxi University

Autler-Townes splitting in absorption spectra of the excited states 6^ 2P3/2 - 8^2S1/2 Of cold cesium atoms confined in a magneto-optical trap has been observed. Experimental data of the Autler-Townes splitting fit well to the dressedatom theory, by which the fact of the cold atoms dressed by cooling/trapping laser beams is revealed. The results of the theoretical fitting with experiment not only told us the effective Rabi frequency cold atoms experienced, but also could be used for measuring the probability amplitudes of the dressed states.

关键词： Autler-Townes doublet dressed state Rabi frequency probability amplitude

Generation of self-oscillations from a singly resonant periodically poled potassium titanyl phosphate crystal frequency doubler

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Chinese Physics B 2013年第6期22卷 418-423页

作者：李渊骥刘勤冯晋霞张宽收 State Key Laboratory of quantum optics and quantum optics Devices Institute of Opto-ElectronicsShanxi University

We report on the generation of self-oscillations from a continuously pumped singly resonant frequency doubler based on a periodically poled potassium titanyl phosphate crystal （PPKTP）. The sustained square-wave and staircase curve of self-oscillations are obtained when the incident pump powers are below and above the threshold of subharmonic-pumped parametric oscillation （SPO）, respectively. The self-oscillations can be explained by the competition between the phase shifts induced by cascading nonlinearity and thermal effect, and the influence of fundamental nonlinear phase shift by the generation of SPO. The simulation results are in good agreement with the experiment data.

关键词： self-oscillations singly resonant frequency doubler phase shift