Improved Parallel Repetition for GHZ-Supported Games via Spreadness

Yang P. Liu, Shachar Lovett, Kunal Mittal

We prove that for any 3-player game $\mathcal{G}$, whose query distribution has the same support as the GHZ game (i.e., all $x,y,z\in \{0,1\}$ satisfying $x+y+z=0(\mathrm{mod}2)$), the val…