Sustained, high-fidelity quantum teleportation
news.fnal.gov
Sustained, high-fidelity quantum teleportation
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Re: Sustained, high-fidelity quantum teleportation
#2I'm confused, as I'm an enthusiast but definitely no physicist.
The article states that quantum information is being teleported via entanglement. However, it was my understanding that one cannot transfer information in such a way as the "information" is only revealed when interacting with the particle.
Could someone perhaps clarify what's going on?
Re: Sustained, high-fidelity quantum teleportation
#3Does this mean information can be transmitted faster than light speed?
Re: Sustained, high-fidelity quantum teleportation
#4that page links to the “Illinois Express Quantum Network”, and is fascinating. They’re trying to build a Q-MAN from three different Q-LANs in metro Chicago as an experiment??! This is cool!
Re: Sustained, high-fidelity quantum teleportation
#5I'm confused, as I'm an enthusiast but definitely no physicist. The article states that quantum information is being teleported via entanglement. However, it was my understanding that one cannot transfer information in such a way as the "information" is only revealed when interacting with the particle. Could someone perhaps clarify what's going on?
You entangle two systems but in order to actually complete the teleportation you need to measure one system and then convey the outcome of that measurement to the other party. This information is needed by the second party in order for them to be able to correctly collapse the state of their system into one that is identical to the original system being teleported. The information that the first party must convey to the receiving party must be sent in a classical way (e.g. a phone call).
Re: Sustained, high-fidelity quantum teleportation
#6Does this mean information can be transmitted faster than light speed?
No. Long range quantum networking means that guarantees on the security of communication between quantum computers in the network can be made. Short range means that quantum compute clusters can be made, to make quantum computers that can process more qubits.
Re: Sustained, high-fidelity quantum teleportation
#7Does this mean information can be transmitted faster than light speed?
No, while entanglement acts instantaneously across a large distance, there's no way for that "signal" to carry any information. In order to complete the teleportation the two parties must somehow communicate in order to convey an additional piece of information. This communication would be classical and slower than light.
Re: Sustained, high-fidelity quantum teleportation
#8Does this mean information can be transmitted faster than light speed?
No, while entanglement acts instantaneously across a large distance, there's no way for that "signal" to carry any information. In order to complete the teleportation the two parties must somehow communicate in order to convey an additional piece of information. This communication would be classical and slower than light.
Any chance that communication could happen _before_ the measurement?
Entangle some matter, give half of it to the space team and then have inter-stellar walkie talkies?
Re: Sustained, high-fidelity quantum teleportation
#9Earlier quoted context omitted.
No, while entanglement acts instantaneously across a large distance, there's no way for that "signal" to carry any information. In order to complete the teleportation the two parties must somehow communicate in order to convey an additional piece of information. This communication would be classical and slower than light.
Any chance that communication could happen _before_ the measurement? Entangle some matter, give half of it to the space team and then have inter-stellar walkie talkies?
The whole point is the other party needs to know the result of your measurement, and you don't know that before you measured (otherwise the particles wouldn't be entangled).
Re: Sustained, high-fidelity quantum teleportation
#10Earlier quoted context omitted.
No, while entanglement acts instantaneously across a large distance, there's no way for that "signal" to carry any information. In order to complete the teleportation the two parties must somehow communicate in order to convey an additional piece of information. This communication would be classical and slower than light.
Any chance that communication could happen _before_ the measurement? Entangle some matter, give half of it to the space team and then have inter-stellar walkie talkies?
You can't use entanglement (on its own) to communicate at all.