Control of mixed-state quantum systems by a train of short pulses

Details Control of mixed-state quantum systems by a train of short pulses Control of mixed-state quantum systems by a train of short pulses

2005-10-14

arxiv.org/abs/quant-ph/0510114v1

Phys. Rev. A 72, 032704 (2005)

Physics

Quantum Physics

10 pages, 8 figures

Scientific paper

10.1103/PhysRevA.72.032704

A density matrix approach is developped for the control of a mixed-state quantum system using a time-dependent external field such as a train of pulses. This leads to the definition of a target density matrix constructed in a reduced Hilbert space as a specific combination of the eigenvectors of a given observable through weighting factors related with the initial statistics of the system. A train of pulses is considered as a possible strategy to reach this target. An illustration is given by considering the laser control of molecular alignment / orientation in thermal equilibrium.

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