In my last few posts I have been summarizing papers I’ve read into digestable components, and I’ve hit a point where I cannot faithfully deconstruct them perfectly. So I’m having writer’s block at the moment for my next post.

So I’m trying a new concept: publishing what inspired me as notes!

Quantum Correlations with No Causal Order

As always, all credits to the authors, all mistakes are my own.

This paper¹ presents a look into the weirdness of quantum mechanics that I’ve felt missing since quantum teleportation, the notion of causal structure or lack thereof. In short, with only local quantum mechanics, you don’t need to assume the world has global cause-effect structure.

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A quantum network is fundamentally, a system of interconnected quantum repeaters, each one exchanging qubits with another. In my last post, we had a quick overview of the quantum network system, so in this post, let’s talk more about the links between repeaters themselves.

As with all quantum computing, this is largely theoretical and subject to change when a physical adaptation of quantum networks is realized. This post was largely a summary of work by Jones, C. et al. ¹ all credit goes to them and any errors are my own.

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Quantum computing, much like classical computing is limited when doing computation on a single machine. Today, you don’t really feel that since only having 1000 physical qubits on a single machine is the state of the art ¹. But for future use cases and with more qubits to work with, more importantly increased resource requirements, having a way to communicate between them is a neccessity. This is why some are working towards quantum communication, including myself.

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