Petiziol Francesco, Arimondo Ennio, Giannelli Luigi, Mintert Florian, Wimberger Sandro
Department of Mathematical, Physical and Computer Sciences, University of Parma, Parco Area delle Scienze 7/A, 43124, Parma, Italy.
National Institute for Nuclear Physics (INFN), Milano Bicocca Section, Parma Group, Parco Area delle Scienze 7/A, 43124, Parma, Italy.
Sci Rep. 2020 Feb 10;10(1):2185. doi: 10.1038/s41598-020-59046-8.
The difficulty in combining high fidelity with fast operation times and robustness against sources of noise is the central challenge of most quantum control problems, with immediate implications for the realization of quantum devices. We theoretically propose a protocol, based on the widespread stimulated Raman adiabatic passage technique, which achieves these objectives for quantum state transfers in generic three-level systems. Our protocol realizes accelerated adiabatic following through the application of additional control fields on the optical excitations. These act along frequency sidebands of the principal adiabatic pulses, dynamically counteracting undesired transitions. The scheme facilitates experimental control, not requiring new hardly-accessible resources. We show numerically that the method is efficient in a very wide set of control parameters, bringing the timescales closer to the quantum speed limit, also in the presence of environmental disturbance. These results hold for complete population transfers and for many applications, e.g., for realizing quantum gates, both for optical and microwave implementations. Furthermore, extensions to adiabatic passage problems in more-level systems are straightforward.
将高保真度与快速操作时间以及对噪声源的鲁棒性相结合的困难是大多数量子控制问题的核心挑战，这对量子器件的实现有着直接影响。我们从理论上提出了一种基于广泛应用的受激拉曼绝热通道技术的协议，该协议可在通用三能级系统中实现量子态转移的这些目标。我们的协议通过在光激发上应用额外的控制场来实现加速绝热跟踪。这些控制场沿着主要绝热脉冲的频率边带起作用，动态抵消不期望的跃迁。该方案便于实验控制，不需要新的难以获取的资源。我们通过数值模拟表明，该方法在非常广泛的控制参数集下都是有效的，即使在存在环境干扰的情况下，也能使时间尺度更接近量子速度极限。这些结果适用于完全粒子数转移以及许多应用，例如用于实现量子门，无论是光学实现还是微波实现。此外，将其扩展到更多能级系统中的绝热通道问题也很简单。
