New answers tagged

2

If you are happy with Bob being right only in some percentage of the cases, there is a much easier protocol which does not even require entanglement: Just let Bob guess Alice's bits. He will be right in 50% of the cases. Note that once the probability to guess the right result is above 50%, communication is possible, e.g. by doing majority voting. In ...


0

Photon C is in some quantum state near Alice. A and B are entangled photons. Pairs of entangled particles can be described by a wave function that is a superposition of four possible states, each with a prob. of 1/4. Photon B is sent to Bob far away, e.g. via laser bean. Now Alice has A and has C. A wave function describes three particles, C, A and B, again ...


20

This is really a subtle point. You are right that in 25% of the cases, Bob will randomly chose the "correct" measurement basis and thus get the correct value. However, there is no way for Bob to know when he has actually chosen the right basis and when he has chosen the wrong basis, so his measurement outcome does not contain more information that a random ...


4

Quantum teleportation is a concept of transferring quantum states of matter. Not teleporting matter itself. To "clone" an object to the destination, you need to have the same material as the object already prepared at the destination. You can teleport the state of the object to the destination (of course, purely talking in theory). Then you may be able to ...



Top 50 recent answers are included