A股三大指数集体上涨，沪指重回4000点！科创50指数涨逾3%，海光信息涨逾8%，寒武纪涨近6%

Core Viewpoint - The ChiNext 50 Index has increased by over 3%, indicating a positive market sentiment towards technology stocks, particularly in the semiconductor sector [1] Group 1: Market Performance - The ChiNext 50 Index rose by more than 3% [1] - Haiguang Information saw a rise of over 8% [1] - Cambricon Technologies experienced an increase of nearly 6% [1]