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arXiv 0909.4788quant-ph
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弱非线性振子Fock态的最优产生

Optimal generation of Fock states in a weakly nonlinear oscillator

B. Khani, J. M. Gambetta, F. Motzoi, F. K. Wilhelm

摘要:

我们应用最优控制理论,以确定最短的时间内,可以创建一个能量本征态的弱非谐振子的实际约束下的线性驱动。我们表明,最佳脉冲的跳动主要是过渡到所需的状态和下一个泄漏水平的过渡频率。对于给定的非线性标度,非线性参数δ为α的幂律,α =-0.73 +/-0.029,最短可能脉冲的时间。这是相对于由简单的朗道-齐纳论证所建议的值α =1的质的改进。

英文摘要:

We apply optimal control theory to determine the shortest time in which an energy eigenstate of a weakly anharmonic oscillator can be created under the practical constraint of linear driving. We show that the optimal pulses are beatings of mostly the transition frequencies for the transitions up to the desired state and the next leakage level. The time of a shortest possible pulse for a given nonlinearity scale with the nonlinearity parameter delta as a power law of alpha with alpha=-0.73 +/-0.029. This is a qualitative improvement relative to the value alpha=1 suggested by a simple Landau-Zener argument.

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