Explore the concept of pseudo entropy and its applications in de Sitter holography in this advanced physics lecture by Professor Tadashi Takayanagi from Kyoto University. Delve into the generalization of entanglement entropy, examining its dependence on both initial and final states. Learn about the basic properties of pseudo entropy and its holographic calculations. Discover recent numerical results in free scalar field theory and spin systems, suggesting pseudo entropy's potential as a new quantum order parameter. Investigate the application of pseudo entropy to holography in de Sitter spaces and entanglement phase transitions. Gain insights from a renowned expert in quantum entanglement and holography, whose work has significantly contributed to relating gravitational spacetimes and quantum information.