Can the two-time interpretation of quantum mechanics solve the measurement problem?

•Introduces the two state vector formalism for quantum mechanics, due to Aharonov et al.•Criticizes the claim that the two-time interpretation, can solve the measurement problem.•A key feature: the backwards-evolving wavefunction, is given an alternative interpretation.

Over many years, Aharonov and co-authors have proposed a new interpretation of quantum mechanics: the two-time interpretation. This interpretation assigns two wavefunctions to a system, one of which propagates forwards in time and the other backwards. In this paper, I argue that this interpretation does not solve the measurement problem. In addition, I argue that it is neither necessary nor sufficient to attribute causal power to the backwards-evolving wavefunction 〈Φ| and thus its existence should be denied, contra the two-time interpretation. Finally, I follow Vaidman in giving an epistemological reading of 〈Φ|.