To get an idea of how entanglement distillation will work in practice, it is helpful to look at an example of this process in action. In this lecture, Filip Rozpedek outlines a simplified entanglement distillation protocol which uses individual measurements with Alice and Bob’s devices to determine if they have accidentally been given a separable state. These measurements are reminiscent of quantum error correction, discussed in Module 3. The main difference here is that, when Alice and Bob detect that an error has occurred, they don’t need to correct it, they can simply discard their bits and try again.

Main takeaways

• By creating 2 entangled pairs one can use a gate and measurement scheme to get a measurement result which verifies an entangled state.
• Instead of 2 pairs, we end up with only 1 entangled state. In general, one can create the protocol such that this single entangled state is more entangled than either of the two initial states.