Trajectory-constrained optimal local time-continuous waveform controls for state transitions in $N$-level quantum systems

Details Trajectory-constrained optimal local time-continuous waveform controls for state transitions in $N$-level quantum systems Trajectory-constrained optimal local time-continuous waveform controls for state transitions in $N$-level quantum systems

2010-10-14

arxiv.org/abs/1010.2805v4

Physics

Quantum Physics

4 pages, 1 figures

Scientific paper

Based on a parametrization of pure quantum states we explicitly construct a sequence of (at most) $4N-5$ local time-continuous waveform controls to achieve a specified state transition for $N$-level quantum systems when sufficient controls of the Hamiltonian are available. The control magnitudes are further optimized in terms of a time-energy performance, which is a generalization of the time performance index. Trajectory-constrained optimal local time-continuous waveform controls, including both local sine-waveforms and $n^{\rm th}$-order-polynomial waveform controls are obtained in terms of time-energy performance. It is demonstrated that constrained optimal local $n^{\rm th}$-order-polynomial waveform controls approach constrained optimal bang-bang controls when $n\rightarrow\infty$.

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