Alibaba Group Holding Ltd. has secured a high-profile customer in China Unicom for its AI chips, suggesting the Chinese tech leader’s nascent semiconductor efforts are gaining traction in its home market.China’s e-commerce leader has signed a contract with the country’s No. 2 wireless carrier to deploy its Pingtouge or “T-Head” AI accelerators, according to a video posted late Tuesday by state broadcaster CCTV. The chips will go into the mobile operator’s big new data center in northwestern Chin...