IISER MOHALI

Abstract: Quantum state preparation is a cornerstone of quantum technologies, underpinning applications in computation, communication, and sensing. While identification and control of systems and devices based on classical mechanics is commonly achieved in everyday technology, we are still unable to accurately control quantum systems. Due to their size and sensitivity to the environment and to our limited understanding of their underlying laws, natural and engineered quantum systems are particularly difficult to characterize and control. The need for accurate state preparation protocol becomes increasingly pronounced in non-Markovian open quantum systems, where environmental memory and model uncertainties pose significant challenges to achieving high-fidelity control. Here, we introduce a generalized invariant-based protocol for single-qubit state preparation under arbitrary noise conditions. Our framework extends invariant-based control to realistic open-system regimes, providing a versatile route toward robust quantum state engineering on NISQ hardware and other platforms exhibiting non-Markovian dynamics. This research sits at the intersection of physics, engineering, and computation, making it relevant for those interested in both fundamental science and emerging quantum technologies.

Reference: https://arxiv.org/abs/2510.15340