Problems with modelling closed timelike curves as post-selected teleportation

TL;DR

This paper critiques the modeling of closed timelike curves as post-selected teleportation, highlighting issues like backward signaling and paradox formation, which challenge the consistency of such models.

Contribution

It demonstrates that modeling CTCs as post-selected teleportation leads to problematic signaling and paradoxes, questioning the validity of this approach.

Findings

Signaling to past times is possible before CTC creation.

Information paradoxes can form in this model.

The approach may be fundamentally inconsistent.

Abstract

In this comment on S.Lloyd, et al, Phys.Rev.Lett. 106, 040403 (2011), we show that modelling closed timelike curves (CTCs) as post-selected teleportation allows signalling to past times before the creation of the CTC and allows information paradoxes to form.