Quantum technologies based on adiabatic techniques can be highly effective, but often at the cost of being very slow. Here we introduce a set of experimentally realistic, non-adiabatic protocols for spatial state preparation, which yield the same fidelity as their adiabatic counterparts, but on fast timescales. In particular, we consider a charged particle in a system of three tunnel-coupled quantum wells, where the presence of a magnetic field can induce a geometric phase during the tunnelling processes. We show that this leads to the appearance of complex tunnelling amplitudes and allows for the implementation of spatial non-adiabatic passage. We demonstrate the ability of such a system to transport a particle between two different wells and to generate a delocalised superposition between the three traps with high fidelity in short times.

中文翻译：

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使用几何相位的非绝热空间通道

基于绝热技术的量子技术可能非常有效，但通常会非常缓慢。在这里，我们介绍了一组用于空间状态准备的实验上可行的，非绝热协议，这些协议与绝热协议具有相同的保真度，但是时间尺度很快。特别地，我们考虑了三个隧道耦合量子阱系统中的带电粒子，在该系统中，磁场的存在会在隧穿过程中感应出几何相位。我们表明，这导致出现复杂的隧穿振幅，并允许实现空间非绝热通道。我们证明了这种系统能够在两个不同的井之间传输粒子，并在短时间内以高保真度在三个陷阱之间产生离域叠加。