PSPACE is also equal to PCTC, problems solvable by classical computers using closed timelike curves,. as well as to BQPCTC, problems solvable by quantum computers using closed timelike curves.
PSPACE is also equal to PCTC problems ,solvable by classical computers using closed timelike curves, as well as to. BQPCTC, problems solvable by quantum computers using closed timelike curves.