It lets you bypass some classical limits. It's a well known idea. For example, John Preskill mentioned entangled telescopes in a non-technical talk back in Febr

It lets you bypass some classical limits. It's a well known idea. For example, John Preskill mentioned entangled telescopes in a non-technical talk back in February [1]. A specific case is "NOON" states [2]: > NOON states are an important concept in quantum metrology and quantum sensing for their ability to make precision phase measurements when used in an optical interferometer. --- Here's an example that doesn't exactly use entanglement, but does use quantum stuff to give you the general flavor. Suppose you have an optical setup like this: B | v A --> ◩ -----> D1 | | v D2 When a photon is emitted from A, or B, it passes through a beam splitter then continues on to the two detectors and triggers one of them. If the detectors are classical, then there's no way for you to distinguish whether A or B emitted the photon. Both are a 50/50 split. But if the detectors can store their readings at various times as quantum information and keep that information coherent, then you can bring the stored qubits together, simulate un-applying the beam splitter, and voila! The same basic idea applies to telescopes: photons from different sources spread out in slightly different ways, and we can undo some of that spreading with quantum computation. 1: https://youtu.be/lN8zT_Yk5sg?t=3m58s https://youtu.be/lN8zT_Yk5sg?t=3m58s 2: https://en.wikipedia.org/wiki/NOON_state https://en.wikipedia.org/wiki/NOON_state