中国物理B

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HIGHER-ORDER CORRECTION FOR ROTATING WAVE APPROXIMATION, RABI TRANSFORMATION, AND ITS APPLICATIONS IN THE JAYNES-CUMMINGS MODEL

王晓光, 孙昌璞

1996 (12): 881-889. doi: 10.1088/1004-423X/5/12/001

摘要 ( 1263 )

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Taking into account the consistence of the quantum adiabatic approximation and the rotating wave approximation in essence, we propose a method to study the interaction between atom and radiation field in a quantized cavity systematically. By using the exact solution of Jaynes-Cummings model as the lowest-order approximation, the effect of high frequency terms on the dynamics of atom-cavity field system is studied analytically.

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OBSERVATIONS OF HOMOCLINIC CHAOS THROUGH ALTERNATING PERIODIC-CHAOTIC SEQUENCES IN A NONLINEAR CIRCUIT

马连喜, 孙红岩, 王龙

1996 (12): 890-900. doi: 10.1088/1004-423X/5/12/002

摘要 ( 1076 )

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Homoclinic chaos in the alternating periodic-chaotic sequences is observed in a nonlinear circuit with sinusoidal driving force. In particular, a complete Alternating Periodic-Chaotic sequence is recorded with a high-resolution up to P⁽⁸⁾ state. The experimental results, analyzed by constructing the time of flight and the next maximal amplitude return maps, are in good agreement with the scenario described by Shilnikov. The underlying dynamics of homoclinic chaos is determined from the next amplitude return map, to be that of a unimodal map and thus a strong dissipation case.

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A NEW MEASURE FOR THE JAYNES-CUMMINGS MODEL DYNAMICS DISTANCE BETWEEN DENSITY OPERATORS

黄燕霞, 郭光灿

1996 (12): 901-910. doi: 10.1088/1004-423X/5/12/003

摘要 ( 1113 )

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We use the distance between density operators to study the dynamical evolution of the Jaynes-Cummings model with an additional Kerr medium, and to compare the result with the corresponding von Neumann entropy. We have shown that the distance between density operators can provide more detailed information about the dynamical behavior of the quantum system than von Neumann entropy.

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QUANTUM THEORY OF n-PHOTON CORRELATED-SPONTANEOUS-EMISSION LASERS

胡响明, 彭金生

1996 (12): 911-922. doi: 10.1088/1004-423X/5/12/004

摘要 ( 989 )

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In this paper, n-photon correlated-spontaneous-emission lasers (GEL's) are studied via the quantum theory of Scully-Lamb. It is shown that inversionless lazing can be exhibited; and phase squeezing can be produced in the inversionless region when the laser intensity is smaller than a certain value. The unified approach to n-photon CEL's is given and the properties between n-photon CEL's (n≥3) and CEL's of n = 1,2 are compared.

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ANALYTICAL MODELING OF THE RECOMBINATION CURRENT IN THE BASE-EMITTER SPACE CHARGE REGION OF HETEROJUNCTION BIPOLAR TRANSISTORS

严北平, 罗晋生

1996 (12): 923-929. doi: 10.1088/1004-423X/5/12/005

摘要 ( 1111 )

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An analytical modeling of the recombination current in the base-emitter space charge region of heterojunction bipolar transistors is derived. The recombination rates as functions of distance in the space charge region are calculated for different hase doping concentrations. The relations between the space charge recombination current and the applied voltage have been determined.

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