What does it mean to have a distributed quantum computer? Because if these distributed quantum computers are connected by classical communication channels (e.g. the internet), then it has been proven that this cannot provide any quantum speedup over just a single quantum computer.
So to actually get a quantum speedup, these quantum computers will need to be connected with quantum channels, which are possible IRC with fiber optic links (eg. by using the quantum state of the photons). But that is not the case.
See Jozsa & Linden 2003: https://arxiv.org/abs/quant-ph/0201143
So to actually get a quantum speedup, these quantum computers will need to be connected with quantum channels, which are possible IRC with fiber optic links (eg. by using the quantum state of the photons). But that is not the case.