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We here introduce a Fortran code that computes anharmonic free energy ofsolids from first-principles based on our phonon quasiparticle approach. Inthis code, phonon quasiparticle properties, i.e., renormalized phononfrequencies and lifetimes, are extracted from mode-projected velocityauto-correlation functions (VAF) of modes sampled by molecular dynamics (MD)trajectories. Using renormalized frequencies as input, the code next constructsan effective harmonic force constant matrix to calculate anharmonic phonondispersions over the whole Brillouin zone and thus the anharmonic free energyin the thermodynamic limit ($N \rightarrow \infty$). We illustrate the use ofthis code to compute ab initio temperature-dependent anharmonic phonons of Siin the diamond structure.

phq: a Fortran code to compute phonon quasiparticle properties and dispersions