论文标题
使用不同方案的半导体量子点制备期间的声子波数据包发射
Phonon wave packet emission during state preparation of a semiconductor quantum dot using different schemes
论文作者
论文摘要
半导体量子点中的载波 - 载波相互作用会极大地影响激发态的光学制备。对于RABI制备方案中使用的共振激发，极性伴随着声子波数据包的发射，从而导致制备保真度的退化。在本文中，分析了用于不同相干激发方案的声子波数据包。一个例子是依靠激励的绝热快速通道方案。在这里，也发出了声子波数据包，但是制备保真度仍然可能是统一性。重点是对最近提出的两种脉冲引起的最近提出的摇摆方案的撞击。与RABI方案类似，尽管有失调，但仍发现了降解和声子波数据包发射。如果挥杆频率与最大声子光谱密度重合，则会发出一系列的波数据包，从而产生更强的降解。从我们的结果中获得的见解将进一步有助于设计量子点的最佳准备方案。
The carrier-phonon interaction in semiconductor quantum dots can greatly affect the optical preparation of the excited state. For resonant excitation used in the Rabi preparation scheme, the polaron is formed accompanied by the emission of a phonon wave packet, leading to a degradation of preparation fidelity. In this paper, phonon wave packets for different coherent excitation schemes are analyzed. One example is the adiabatic rapid passage scheme relying on a chirped excitation. Here, also a phonon wave packet is emitted, but the preparation fidelity can still be approximately unity. A focus is on the phonon impact on a recently proposed swing-up scheme, induced by two detuned pulses. Similar to the Rabi scheme, a degradation and a phonon wave packet emission is found, despite the detuning. If the swing-up frequency coincides with the maximum of the phonon spectral density, a series of wave packets is emitted yielding an even stronger degradation. The insight gained from our results will further help in designing an optimal preparation scheme for quantum dots.
