![]() My search online has not been fruitful, since the only similar questions I’ve seen just say something like “When you have entangled photons, measurements on one member of the pair cannot tell you anything about whether the other member has been measured or not.”, which seems to be contradicted by the above experiment. ![]() I’d be very appreciative if you could clear this up for me. If the ‘s’ photon shows an interference pattern, then you would know the result of the electron (or know that forces beyond your control erase the information for some other reason). For instance, measuring the ‘s’ photon and detecting interference patterns or not, while the ‘p’ photon is bouncing around in some system, waiting to have its polarization be either erased or measured depending on the result of some future event, like an election result. The fact that the ‘s’ photon in the experiment showed interference patterns when the ‘p’ photon was going to be erased, but hadn’t been yet, makes me think that photons can retrieve information from the future. Of course, even stranger situations are possible. If he sees an interference pattern, he knows that Alice must have “erased” the polarization information on her corresponding ‘p’ photons, and if not that she has instead measured it. At a predetermined time Bob releases his photons one by one into a double slit setup as in the experiment. Suppose Alice and Bob generate many entangled photons and then travel to opposite sides of the galaxy, Alice taking the ‘p’ photons and Bob taking the ‘s’ photons. In the experiment, changing whether the polarization of the ‘p’ photon is erased or not changes whether or not interference patterns appear for the ‘s’ photon. ![]() Of course, this violates the “no-communication theorem”, so I assume it’s due to a misunderstanding on my part. As soon as Alice's interference pattern disappears, she knows she's supposed to take the clothes out to the dry cleaners.Based on my understanding of the “Double-Slit Quantum Eraser Experiment”, documented here:, it seems that Faster-Than-Light communication is possible. Bob tells Alice, "As soon as I force my particle to pick a state, take the clothes to the dry cleaners." In his room, Bob forces his particle to pick a state, while Alice is observing the interference pattern from her photons in her room. ![]() While quantum entanglement doesnt allow for communication faster than the speed of light, instant agreement can. We can use entangled qubits to create instantaneous agreement on information across very long distances. But the phenomenon can be used to secure a classical communications channel against. I know that you can't send any information over the channel to the other side faster than light because you don't know which side picked which state, but what if all I'm interested in is that the other side picked any state?įor example, if Alice is in one room while Bob is in another. Quantum entanglement can be used for communication by taking advantage of the unique correlations exhibited by entangled qubits. No, quantum entanglement cant be used to communicate at any speed. And yes, entanglement is faster than light, but is absolutely useless when it comes to transmitting information faster than light because the particles have to get to their destination at sub-luminal (or luminal for massless particles) speeds. ![]() I was wondering if it was possible to communicate a signal through to the other side faster than light. He is referring to a phenomenon known as quantum entanglement. I've been reading some stuff about quantum entanglement and I stumbled upon an article talking about a delayed choice quantum eraser experiment using parametric down conversion. ![]()
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