Optimal control of quantum state preparation and entanglement creation in two-qubit quantum system with bounded amplitude

被引：0
作者：
Xikun Li
机构：
[1] Anhui University,School of Physics and Optoelectronic Engineering
[2] Max-Planck-Institut für Physik komplexer Systeme,Department of Physics and Astronomy
[3] Aarhus University,undefined
来源：
Scientific Reports | / 13卷
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摘要：
We consider the optimal control problem in a two-qubit system with bounded amplitude. Two cases are studied: quantum state preparation and entanglement creation. Cost functions, fidelity and concurrence, are optimized over bang-off controls for various values of the total duration, respectively. For quantum state preparation problem, three critical time points are determined accurately, and optimal controls are estimated. A better estimation of the quantum speed limit is obtained, so is the time-optimal control. For entanglement creation problem, two critical time points are determined, one of them is the minimal time to achieve maximal entanglement (unit concurrence) starting from the product state. In addition, the comparisons between bang-off and chopped random basis (CRAB) are made.
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