I swear, throw the words "quantum teleportation" into a press release and science reporters lose their damn minds. It's impossible to encode information via quantum entanglement. Entanglement is a...
I swear, throw the words "quantum teleportation" into a press release and science reporters lose their damn minds.
It's impossible to encode information via quantum entanglement. Entanglement is a fundamentally random phenomenon. In order to encode information you have to interact with the particles, at which point their states become fixed and quantum teleportation is impossible.
I really wish they'd chosen a better name for the phenomenon, because "teleportation" just leads people to make wild and wildly inaccurate speculations.
This actually involves entanglement and the article simply mentions that without hyping up entanglement in any way. Why are you saying they lost their damn minds?
This actually involves entanglement and the article simply mentions that without hyping up entanglement in any way. Why are you saying they lost their damn minds?
The writer is assuming that because the quantum state of entangled particles can be determined by observing just one particle, the state information is actually transmitted between the two...
Exemplary
The writer is assuming that because the quantum state of entangled particles can be determined by observing just one particle, the state information is actually transmitted between the two "instantaneously," and that can be a carrier for classical information. (Edit for clarity: the determination of states does occur "instantaneously," as the states are not actually determined until the particles interact with something, but this cannot be a carrier of classical information, for the reasons I badly sketch out further down.) The "instantaneous" communication supposed to occur between two entangled particles can only work when the states of those particles is probabilistic and indeterminate. You can't set the state for one particle without setting the state for both at the point of transmission, which negates its utility as a medium of information transmission beyond what we're already capable of.
You can "instantaneously" know information about one entangled particle that's very far away by the state of the other, but that state isn't actually determined until you destructively observe the proximate particle. There's no way to encode classical information prior to destructively observing one or the other particle, therefore what information is "instantaneously" transmitted is fundamentally random.
I have been putting "instantaneously" in quotes because the concept itself is problematic when talking about quantum and relativistic effects. People call c "the speed of light," but really that's inaccurate, or at least incomplete. Really, c is the speed of causality. It's the minimum time anything can take to affect anything else in the universe measured by distance. When you say that something is faster than light, you're essentially saying that it reverses causality, which the universe apparently really dislikes.
In that sense, you can "instantaneously" know the state of a faraway particle without matter or energy being exchanged between the two particles, but that information you glean has to be fundamentally meaningless, otherwise it runs afoul of causality.
The feat of this experiment is in the transmission via standard communications lines and the filtering employed. It isn't a leap forward in faster-than-light communications, because the universe does not allow causality to break by allowing information to move over distances faster than causality can occur. The writer has misunderstood how information works, or else has simply disregarded it in excitement. This sort of thing seems to happen a lot when the words "quantum teleportation" are trotted in, which is why I say they "lose their damn minds."
I wouldn't go as far as "lost their damn minds", but there's several parts which seem either just wrong, or very misleading. For instance ??? How is it any faster, or more secure than classical...
I wouldn't go as far as "lost their damn minds", but there's several parts which seem either just wrong, or very misleading. For instance
Quantum teleportation, a process that harnesses the power of quantum entanglement, enables an ultra-fast and secure method of information sharing between distant network users.
??? How is it any faster, or more secure than classical communication? It doesn't justify that statement at all.
Unlike traditional communication methods, quantum teleportation does not require the physical transmission of particles. Instead, it relies on entangled particles exchanging information over great distances.
Well, except for the part where quantum teleportation requires classical information to be sent as a pre-requisite. Which, y'know, requires the physical transmission of particles. I guess that can be technically correct, but it's really misleading when the information you sent with quantum teleportation actually cannot be used without sharing classical information.
Sure, but the university's press release says: So it sounds to me (keeping in mind that I know fuck all about this stuff) that you're right, the state of entangled particles becomes fixed when...
It's impossible to encode information via quantum entanglement. Entanglement is a fundamentally random phenomenon. In order to encode information you have to interact with the particles, at which point their states become fixed and quantum teleportation is impossible.
The process works by harnessing quantum entanglement, a technique in which two particles are linked, regardless of the distance between them. Instead of particles physically traveling to deliver information, entangled particles exchange information over great distances — without physically carrying it.
“By performing a destructive measurement on two photons — one carrying a quantum state and one entangled with another photon — the quantum state is transferred onto the remaining photon, which can be very far away,” said Jordan Thomas, a Ph.D. candidate in Kumar’s laboratory and the paper’s first author. “The photon itself does not have to be sent over long distances, but its state still ends up encoded onto the distant photon. Teleportation allows the exchange of information over great distances without requiring the information itself to travel that distance.”
So it sounds to me (keeping in mind that I know fuck all about this stuff) that you're right, the state of entangled particles becomes fixed when observed, but that's why and how this experiment works?[1]
It doesn't even seem to me like this is the interesting or groundbreaking part of the study. The important bit here seems to be that this sort of "quantum information exchange" can occur within the same fiber optic lines we already use:
“Quantum teleportation has the ability to provide quantum connectivity securely between geographically distant nodes,” Kumar said. “But many people have long assumed that nobody would build specialized infrastructure to send particles of light. If we choose the wavelengths properly, we won’t have to build new infrastructure. Classical communications and quantum communications can coexist.”
The last part is wrong, or at least misleading to the point of being wrong. Quantum teleportation requires that classical information be sent between the two parties per the No-communication...
“The photon itself does not have to be sent over long distances, but its state still ends up encoded onto the distant photon. Teleportation allows the exchange of information over great distances without requiring the information itself to travel that distance.”
The last part is wrong, or at least misleading to the point of being wrong. Quantum teleportation requires that classical information be sent between the two parties per the No-communication Theorem, and classical information needs to have a physical medium.
Engineers at Northwestern University successfully demonstrated quantum teleportation over a fiber optic cable carrying internet traffic. By utilizing a less crowded wavelength and special filters, they were able to transmit quantum information alongside traditional internet data. This breakthrough opens the door to a future where quantum and classical networks can coexist, offering unprecedented security and speed.
I swear, throw the words "quantum teleportation" into a press release and science reporters lose their damn minds.
It's impossible to encode information via quantum entanglement. Entanglement is a fundamentally random phenomenon. In order to encode information you have to interact with the particles, at which point their states become fixed and quantum teleportation is impossible.
I really wish they'd chosen a better name for the phenomenon, because "teleportation" just leads people to make wild and wildly inaccurate speculations.
This actually involves entanglement and the article simply mentions that without hyping up entanglement in any way. Why are you saying they lost their damn minds?
The writer is assuming that because the quantum state of entangled particles can be determined by observing just one particle, the state information is actually transmitted between the two "instantaneously," and that can be a carrier for classical information. (Edit for clarity: the determination of states does occur "instantaneously," as the states are not actually determined until the particles interact with something, but this cannot be a carrier of classical information, for the reasons I badly sketch out further down.) The "instantaneous" communication supposed to occur between two entangled particles can only work when the states of those particles is probabilistic and indeterminate. You can't set the state for one particle without setting the state for both at the point of transmission, which negates its utility as a medium of information transmission beyond what we're already capable of.
You can "instantaneously" know information about one entangled particle that's very far away by the state of the other, but that state isn't actually determined until you destructively observe the proximate particle. There's no way to encode classical information prior to destructively observing one or the other particle, therefore what information is "instantaneously" transmitted is fundamentally random.
I have been putting "instantaneously" in quotes because the concept itself is problematic when talking about quantum and relativistic effects. People call c "the speed of light," but really that's inaccurate, or at least incomplete. Really, c is the speed of causality. It's the minimum time anything can take to affect anything else in the universe measured by distance. When you say that something is faster than light, you're essentially saying that it reverses causality, which the universe apparently really dislikes.
In that sense, you can "instantaneously" know the state of a faraway particle without matter or energy being exchanged between the two particles, but that information you glean has to be fundamentally meaningless, otherwise it runs afoul of causality.
The feat of this experiment is in the transmission via standard communications lines and the filtering employed. It isn't a leap forward in faster-than-light communications, because the universe does not allow causality to break by allowing information to move over distances faster than causality can occur. The writer has misunderstood how information works, or else has simply disregarded it in excitement. This sort of thing seems to happen a lot when the words "quantum teleportation" are trotted in, which is why I say they "lose their damn minds."
I wouldn't go as far as "lost their damn minds", but there's several parts which seem either just wrong, or very misleading. For instance
??? How is it any faster, or more secure than classical communication? It doesn't justify that statement at all.
Well, except for the part where quantum teleportation requires classical information to be sent as a pre-requisite. Which, y'know, requires the physical transmission of particles. I guess that can be technically correct, but it's really misleading when the information you sent with quantum teleportation actually cannot be used without sharing classical information.
well, maybe the EiC did. staff writes articles, generally someone on the level of EiC makes a title to attract eyes.
Sure, but the university's press release says:
So it sounds to me (keeping in mind that I know fuck all about this stuff) that you're right, the state of entangled particles becomes fixed when observed, but that's why and how this experiment works?[1]
It doesn't even seem to me like this is the interesting or groundbreaking part of the study. The important bit here seems to be that this sort of "quantum information exchange" can occur within the same fiber optic lines we already use:
The last part is wrong, or at least misleading to the point of being wrong. Quantum teleportation requires that classical information be sent between the two parties per the No-communication Theorem, and classical information needs to have a physical medium.
Summary