ALMA 2040+, technologies beyond the current upgrade

The upgrade of the ALMA Wideband Single-Channel Correlator (WSU) is currently underway, making it an opportune time to explore additional possibilities and technologies for further enhancing ALMA's capabilities. In this discussion, we will explore a broad range of potential technologies that could be implemented in the medium to long term, looking toward the years 2040 and beyond. These technologies include extended baselines, focal plane arrays, phased array feeds, additional antennas, and the construction of a large single-dish submillimeter telescope. Additionally, we will consider the technological advancements necessary to realize these goals.