 This paper discusses the use of femtosecond coherent antistokes Raman spectroscopy, cars, to study the vibrational dynamics of a single graphene nanoribbon, GNR. This technique allows for tracking and controlling the quantum coherence between different phonon modes within the GNR, providing insight into the underlying mechanisms of the vibrational dynamics. This article was authored by Yang Luo, Alberto Martin Jimenez, Michelle Bissara, and others.