Static detuning

Figure 4. Excited state population as a function of dimensionless time yc t. Dashed line static detuning A a/7c = 0.5. Dot-dashed line static detuning As/jc = 0.25. Solid and long-dashed lines periodic shifts of the detuning between A a and Ab in the sudden change approximation as shown in Fig. 3. Solid line starting with detuning Aa- Long-dashed line starting with detuning A b ...

The times ta and r/> spent at each static detuning value A a and A/> arc proportional to the periods Ta and Tb of the static population-oscillations, respectively. The coefficients linking 754 and tb to Ta and Tb depend on the difference A4 — A/> but not on the initial value A a or A b- The dynamic asymptotic value of the excited-state population is mainly controlled by the initial value of the detuning whereas the oscillations amplitude is controlled by... 

Figure 5. Fidelity of a superposition state (8) as a function of the dimensionless time 7ct. Dot-dashed line static detuning Aa/7c = 0.5. Long-dashed line periodic shifts of the detuning A at from the large value A a/7c = 0.5 to the smaller one As /7c = 0.25 in the sudden change approximation. Solid line periodic shifts and control phase gates. The start and the end of the gate operation are shown by arrows. The rectangle indicates the position of the enlarged view of the right panel.

In other words the resonances are detuned from R by the static field shift equivalent to N photons, the same result as obtained in the dressed state picture. 

Most of the data are acquired in the same way as described above. K atoms are excited to the 29s and 27d states by the laser excitation, 4s —> 4p — 29s, 27d. The atoms are allowed to collide for 1 //s, after which a rapidly rising detuning pulse is applied, followed by the more slowly rising field ionization pulse. Atoms which have made the transition to the 29p state are selectively ionized by the field ionization pulse and detected. This signal is monitored as the small static tuning field is scanned. The amplitude and phase of the rf field are changed as parameters. 

Thus far, studies of coherent optical processes in a PBG have assumed fixed (static) values of the atomic transition frequency [Quang 1997], However, in order to operate quantum logic gates, based on pairwise entanglement of atoms by field-induced dipole-dipole interactions [Brennen 1999 Petrosyan 2002 Opatrny 2003], one should be able to switch the interaction on- and off-, most conveniently by AC Stark-shifts of the transition frequency of one atom relative to the other, thereby changing its detuning from the PBG edge. 

The axis of the surface coil must be orthogonal to both the static magnetic field and the excitation field. Because the latter is difficult to achieve, inductive coupling of the receiver to the transmitter can be reduced by detuning diodes (Fig. 2.3.8), which are switched into the conducting state by the induced voltage [Beni, Ede2]. 

Figure 18. Excitation spectra showing three methods to identify molecules close to the tip at I. IX (sample 2, d a 250 nm. Upper panel saturation method spectra taken with (a) Pc = 100 pW, and (b) 25 pW. Middle panel static Stark shift method, traces labeled by Ft. Bottom panel Stark shift with transverse dithering method, traces labeled by Ft. The scale is exact for the lowest trace in each panel while the other traces are shifted vertically upward. (0 detuning = 592.067 nm.)...

Figure 15.9 Deflection in the turbine blade measured by displacement transducers (Soi—S03) due to gradually increased quasi-static loads at LTP = 2300 mm from the mounting position and recorded composite behaviour measured by the bridge detuning of the integrated CFY sensors (Choi—Chos) LTP, load transmission point).

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