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Generation and Coherent Control of Pulsed Quantum Frequency Combs

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A new quantum control scheme for multilevel systems based on effective decomposition by intense laser fields.

¹Department of Fundamental Science and Technology, Graduate School of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan. michi@chem.keio.ac.jp

The Journal of Chemical Physics

|March 12, 2009

Summary

A novel quantum control scheme effectively isolates multilevel systems using intense lasers. This method manipulates coherent dynamics and suppresses dissipation in quantum systems.

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Area of Science:

Quantum Control
Laser Physics
Quantum Dynamics

Background:

Controlling quantum systems with multiple energy levels is challenging.
Dissipative processes can disrupt desired quantum dynamics.
Precisely manipulating quantum states requires advanced techniques.

Purpose of the Study:

To propose a new quantum control scheme for general multilevel systems.
To effectively isolate a target subspace within these systems.
To demonstrate control over both coherent and dissipative dynamics.

Main Methods:

Utilizing intense continuous-wave (cw) lasers under specific conditions.
Employing the Green function method combined with projection operators.
Developing an effective Hamiltonian to govern the isolated subspace dynamics.

Main Results:

The proposed scheme successfully isolates target quantum levels.
Coherent population dynamics can be manipulated effectively.
Dissipative effects within the system are significantly suppressed.

Conclusions:

The developed quantum control scheme offers precise manipulation of multilevel systems.
It provides a method to overcome decoherence and control quantum dynamics.
This approach is applicable to various quantum systems, including those with dissipation.