Difference between revisions of "Quantum Control"
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== Two photon absorption in strong field == | == Two photon absorption in strong field == | ||
| − | [[Image:quantum control.jpg|center| | + | [[Image:quantum control.jpg|center|600px]] |
A shaped ultrafast pulse makes it possible to stir a quantum system and thus control a quantum process via light-matter interaction. Two photon absorption(TPA) processes between two states is one of famous systema of coherent control. We study coherent control schemes for a TPA process in a strong field. For a optimal coherent scheme to enhance TPA, strong field effects(dynamic Stark shift) have to be considered. | A shaped ultrafast pulse makes it possible to stir a quantum system and thus control a quantum process via light-matter interaction. Two photon absorption(TPA) processes between two states is one of famous systema of coherent control. We study coherent control schemes for a TPA process in a strong field. For a optimal coherent scheme to enhance TPA, strong field effects(dynamic Stark shift) have to be considered. | ||
| − | [[Image:Setup_dazzler.jpg|center| | + | [[Image:Setup_dazzler.jpg|center|200px]] |
<center>''Fig.1: schematic diagram of the experimental setup''</center> | <center>''Fig.1: schematic diagram of the experimental setup''</center> | ||
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In weak field reigme, a transform-limited pulse is a optimal pulse to enhance a TPA. But it is not a optimal solution in strong field. The dynamic Stark shift disturbs a TPA process. | In weak field reigme, a transform-limited pulse is a optimal pulse to enhance a TPA. But it is not a optimal solution in strong field. The dynamic Stark shift disturbs a TPA process. | ||
| − | [[Image:Intensity_total_v4.jpg|center| | + | [[Image:Intensity_total_v4.jpg|center|200px]] |
<center>''Fig.2: fluoresence as a function of chirp rates and transform-limited intensity of pulses''</center> | <center>''Fig.2: fluoresence as a function of chirp rates and transform-limited intensity of pulses''</center> | ||
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| − | [[Image:Detuning_total_v6.jpg|center| | + | [[Image:Detuning_total_v6.jpg|center|200px]] |
<center>''Fig.3: fluorescence as a function of detuning and chirp rates''</center> | <center>''Fig.3: fluorescence as a function of detuning and chirp rates''</center> | ||
Revision as of 10:39, 10 September 2009
Two photon absorption in strong field
A shaped ultrafast pulse makes it possible to stir a quantum system and thus control a quantum process via light-matter interaction. Two photon absorption(TPA) processes between two states is one of famous systema of coherent control. We study coherent control schemes for a TPA process in a strong field. For a optimal coherent scheme to enhance TPA, strong field effects(dynamic Stark shift) have to be considered.
In weak field reigme, a transform-limited pulse is a optimal pulse to enhance a TPA. But it is not a optimal solution in strong field. The dynamic Stark shift disturbs a TPA process.
A linear chirped pulse is more optimal than a transform-limited pulse.
