sampling at 50 times a second
Using quantum entanglement to achieve zero transmission delay, and then only looking at it once every 20 milliseconds? You may as well just use fiber, as half of the time you will still receive information ahead of a polling-based QE system. Now, the benefit for the QE system increases as the fiber distance increases, so your idea still makes sense for mutli-planetary HFT. Just... not between Chicago and New York.