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Control of population flow in coherently driven quantum ladders
Ruth Garcia-Fernandez1, Aigars Ekers, Leonid P Yatsenko
1Fachbereich Physik der Universität, Erwin-Schrödinger-Strasse, Kaiserslautern, Germany.
Physical Review Letters
|August 11, 2005
Summary
This study presents a robust adiabatic control technique for managing population flow in three-level quantum systems using precisely timed laser pulses, demonstrated with Na2 molecules.
Area of Science:
- Quantum mechanics
- Molecular spectroscopy
- Laser physics
Background:
- Controlling population dynamics in multilevel quantum systems is crucial for applications like quantum computing and sensing.
- Decaying excited states pose challenges due to their short lifetimes and susceptibility to decoherence.
- Precise manipulation of quantum states requires advanced control techniques.
Purpose of the Study:
- To develop and demonstrate a technique for robust adiabatic control of population flow through a preselected decaying excited level in a three-level quantum ladder.
- To investigate the efficiency and robustness of controlling population dynamics by manipulating laser pulse parameters.
- To experimentally validate the proposed technique using a specific molecular system.
Main Methods:
- Theoretical analysis of adiabatic passage through a three-level quantum ladder.
- Implementation of a control scheme using two partly overlapping coherent laser pulses.
- Experimental demonstration using sodium dimer (Na2) molecules in a specific quantum state.
- Varying the pulse delay between laser pulses to control population flow.
Main Results:
- Efficient and robust control of population flow through the intermediate or upper excited level was achieved.
- The technique demonstrated high fidelity in directing population transfer.
- Experimental results with Na2 molecules confirmed the theoretical predictions.
- Sensitivity analysis showed robustness against variations in experimental parameters.
Conclusions:
- The presented adiabatic control technique offers a reliable method for manipulating population dynamics in three-level quantum systems.
- This method provides a pathway for precise control over quantum states, even involving decaying levels.
- The successful demonstration with Na2 molecules highlights the potential applicability of this technique in molecular quantum control and spectroscopy.