What's so unusual about entanglement?

[Simon Phoenix]

You can. Even though the outcomes are completely random(philosophy), if you have many different entangled states, you can choose when to measure("collapse") each pair and depending on the timing between 'measurements', use it as a morse code to send messages(presumably) to the other part of the galaxy. The difficulty is mostly technical to preserve the entanglement intact long enough.

Sorry Bruno - that's just completely incorrect.

There is no measurement Bob can do on his particle alone that will inform him whether Alice has performed a measurement or not - or indeed whether Alice has performed some other (unitary) transformation on her particle.

In order to send a message there must be a correlated change - so something Alice does must cause a corresponding (correlated) change in something that Bob can measure.

Bob's particle is described by a density operator that is just one half the identity operator - and this completely characterizes the probabilities of his measurements. There is no measurement Bob can do that will enable him to distinguish whether his particle is one of an entangled pair - or whether it is simply a single, uncorrelated, particle prepared uniformly at random in an up or down state. Hence there is no conceivable way in which Alice can communicate information to Bob by doing something (anything) to her particle.