This Project Grant award, provided by the National Science Foundation's (NSF) Mathematical and Physical Sciences (MPS) program (CFDA 47.049), supports experimental research on the quantum theory of lattice heat transport in single-walled carbon nanotubes (SWCNTs). The $425,206 award to the University of Texas at Austin aims to advance multiprobe measurement techniques to detect the quantized phonon conductance predicted for SWCNTs at temperatures up to 10 K. If successful, this research is expected to enhance understanding of condensed matter physics principles and provide educational outreach opportunities on quantum and thermal science. No subawards are planned under this grant, which runs from April 1, 2024 to March 31, 2027.