Proceedings of MATSUS Spring 2025 Conference (MATSUSSpring25)
DOI: https://doi.org/10.29363/nanoge.matsusspring.2025.355
Publication date: 16th December 2024
Artificial quantum systems with synthetic dimensions enable the exploration of novel quantum phenomena that are challenging to create in conventional materials. The synthetic degrees-of-freedom effectively increase the system's dimensionality without altering its physical structure, allowing for the study of higher-dimensional physics in lower-dimensional setups. However, synthetic quantum systems can suffer from intrinsic disorder, leading to rapid decoherence and limiting their scalability and collective coherence. This disorder-induced decoherence is a major obstacle in quantum information science and technology. Here we show that long-range interactions can mitigate decoherence and create persistent collective coherence preserved in highly symmetric collective excited states. These states exhibit exceptional robustness, capable of storing long-lived quantum memory despite disorder. We introduce an order parameter to quantify collective coherence, identifying a sharp transition from a zero to a non-zero collective coherence at a critical interaction strength or critical disorder. We denote this phenomenon as “supercoherence” and show its universality in a wide range of systems. This phenomenon not only challenges traditional views on the inevitability of decoherence in disordered quantum systems but also opens new avenues for harnessing collective coherence for quantum information storage and processing.
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