Self Replication and Signalling

TL;DR

This paper explores whether perfect quantum self-replication could enable faster-than-light communication, concluding that such replication would violate the no-signalling principle and imply superluminal signaling.

Contribution

It demonstrates that perfect quantum self-replication, unlike cloning, would also lead to superluminal signaling, highlighting fundamental limits in quantum information.

Findings

Perfect self-replication implies superluminal signaling

Self-replication violates the no-signalling principle

Cloning and self-replication have different implications for causality

Abstract

It is known that if one could clone an arbitrary quantum state one could send signal faster than the speed of light. However it remains interesting to see that if one can perfectly self replicate an arbitrary quantum state, does it violate the no signalling principle? Here we see that perfect self replication would also lead to superluminal signalling.