Docstoc

0207016

Document Sample
0207016 Powered By Docstoc
					                    [a4paper,pra,showpacs,twocolumn]revtex4 amsfonts amssymb amsmath calc graphicx [T1]fontenc [latin2]inputenc
               document Quantum trajectory approach to stochastically-induced quantum interference effects in coherently-
               driven two-level atoms
                    A. Karpati P. Adam W. Gawlik† B. Lobodzi´ ski† Present address: DESY Zeuthen, Platanenallee 6,
                                                                   n
               D-15738 Zeuthen, Germany.
                    J. Janszky 42.50.Lc, 42.50.Gy Department of Nonlinear and Quantum Optics,
                    abstract Stochastic perturbation of two-level atoms strongly driven by a coherent light field is analyzed
               by the quantum trajectory method. A new method is developed for calculating the resonance fluorescence
               spectra from numerical simulations. It is shown that in the case of dominant incoherent perturbation, the
               stochastic noise can unexpectedly create phase correlation between the neighboring atomic dressed states.
               This phase correlation is responsible for quantum interference between the related transitions resulting in
               anomalous modifications of the resonance fluorescence spectra.




8 Zeuthen, Germany.

                                                                  1
                    0.7
                    0.6
S(ω) [arb. units]


                    0.5
                    0.4
                    0.3
                    0.2
                    0.1             Numeric
                                    Analytic
                     0
                          -3   -2    -1     0    1   2   3
                                           ω/Ω
       9
       8
       7
       6
FWHM




       5
       4
       3                              Γ/Ω=10
       2                               Γ/Ω=3
       1                               Γ/Ω=5
                                   Fitted line
       0
           1   2   3   4   5   6 7      8   9 10 11 12
                               Ω/|s-|
          |2,n
|1,n




                 |2,n-1
 |1,n-1
                    0.25

                     0.2
S(ω) [arb. units]




                    0.15

                     0.1

                    0.05
                                  Numeric
                                  Analytic
                      0
                       -10   -5         0    5   10
                                       ω/Ω
                     0.1
                    0.09                       Numeric
                                               Analytic
                    0.08
S(ω) [arb. units]



                    0.07
                    0.06
                    0.05
                    0.04
                    0.03
                    0.02
                    0.01
                        -15   -10   -5    0      5        10   15
                                         ω/Ω
              0.6
                                         |s-|/Ω
              0.5                          γ/Ω
dip width/Ω



              0.4

              0.3

              0.2

              0.1

               0
                    2   4   6   8   10 12 14 16 18 20
                                    Γ/Ω
                     1.8
                                            Numeric
                     1.6                    Analytic
                     1.4
S(ω) [arb. units]


                     1.2
                       1
                     0.8
                     0.6
                     0.4
                     0.2
                       0
                    -0.2
                           -6   -4   -2    0    2      4   6
                                          ω/Ω
                     0.1
                    0.09
                    0.08
S(ω) [arb. units]



                    0.07
                    0.06
                    0.05
                    0.04
                    0.03
                    0.02      Numeric
                              Analytic
                    0.01
                        -15    -10       -5         0   5   10
                                              ω/Ω
            2π


           3π/2
∆φ [rad]




             π


            π/2


             0
                  0   200   400        600   800   1000
                                  Ωt
            2π


           3π/2
∆φ [rad]




             π


            π/2


             0
                  0   200   400        600   800   1000
                                  Ωt
            2π


           3π/2
∆φ [rad]




             π


            π/2


             0
                  0   200   400        600   800   1000
                                  Ωt
            1
                                    Γ/Ω=0.2
          0.8                       Γ/Ω=1.1
          0.6                         Γ/Ω=5

          0.4
Ccos(τ)




          0.2
            0
          -0.2
          -0.4
          -0.6
              -20 -15 -10 -5   0      5   10   15   20
                               Ωτ
            1
                                    Γ/Ω=0.2
          0.8                       Γ/Ω=1.1
          0.6                         Γ/Ω=5

          0.4
Csin(τ)




          0.2
            0
          -0.2
          -0.4
          -0.6
              -20 -15 -10 -5   0      5   10   15   20
                               Ωτ

				
DOCUMENT INFO