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New Micro-Ring Resonator Creates Quantum Entanglement On a Silicon Chip
Zothecula writes: The quantum entanglement of particles, such as photons, is a prerequisite for the new and future technologies of quantum computing, telecommunications, and cyber security. Real-world applications that take advantage of this technology, however, will not be fully realized until devices that produce such quantum states leave the realms of the laboratory and are made both small and energy efficient enough to be embedded in electronic equipment. In this vein, European scientists (abstract) have created and installed a tiny "ring-resonator" on a microchip that is claimed to produce copious numbers of entangled photons while using very little power to do so.
With which I will do ... what, exactly?
As usual, every story to do with quantum anything is pretty much gibberish to the layperson.
Sounds like a quantum mood ring, but I have no idea.
Lost at C:>. Found at C.
Sometimes I have to use my beard like a food filter. I guess you could consider it a quantum entanglement device in large scale.
Harrison's Postulate - "For every action there is an equal and opposite criticism"
Oh really?
Entanglement communicates state by some mechanism that has no measurable latency. Making a computing device based on entanglement would be amazing.
Someone figured out how to quantum fart on a microchip?
"...quantum computing, telecommunications, and cyber security."
Bullshit. Bullshit. DING!!! Cyber security. Now, what happens when we have this whole quantum cyber security system in place, and somebody figures out how to hack it? The entire infrastructure becomes useless. You can claim it is "unhackable", because it is quantum, but that is just the laws of physics as we know them now. The flaw in the idea of security is the same flaw that exists in inflation. It can't go on forever. One day the whole house of cards is going to come tumbling down. And, when it does, it is going to take everyone with it.
I thought that quantum entanglement couldn't transfer coherent communication since it is basically randomized and useful information transfer between particles was impossible.
copious, entangled......
What exactly is on these scientists minds when they come up with their descriptions?
Do their mothers know?
:-)
Well, there goes RSA.
and pretty much any pure algorithm's domain when its range can be determined. (Physical security = best security)
If the entangled photons were far apart, THEN we have secure communications.
IOW: What you do to one happens to the other (similar to this idea http://en.wikipedia.org/wiki/The_Corsican_Brothers )
Oh, there both on the same chip?
Neat but useless unless you can separate the 2.
Quantum physics has proven (over a century) that photons can be entangled, meaning that two completely different photons, in different places, can instantly influence each other. Instant is a whole lot faster than electrons can move.
Also, re encryption. When photons are entangled, it can also be looked at as the same photon at two different places at one time, so there is no transfer of information at all because the data is being transmitted to and from the same photon.
I don't respond to AC's.
Can't wait for my "spooky modem" with secure point to point 0 latency communication to anywhere in the 'verse.
This is actually pretty cool, mostly because it's an efficient source of photon pairs. The time-energy entanglement means that photons with particular energies always come out at particular relative times (that is, pairs of photons are produced by splitting one higher energy photon into two lower energy photons, which are emitted at the same time). Photon pairs like this can be used to do quantum key distribution, a secure method of distributing encryption keys, or, with a memory and some clever entanglement swapping protocols, the entanglement resource could be transported over long distances to do true quantum communication, where measurement in one place guarantees a result at the other place, and anyone listening in will destroy the communication channel.
The linked article states "As photons exited the resonator, the researchers were able to observe that a remarkably high percentage of them exhibited the telltale characteristics of entanglement. ". What number constitutes "remarkably high"? There is no value in the article as there is nothing to be learned other then the researchers are likely looking for more grant money to continue their quest to a "really remarkably high" percentage of something that has "characteristics of entanglement". What are the specifics that lead them to believe that? Is it cold fusion level science?. I see this as useless.
A better source for entangled photon pairs will come in handy for Quantum Cryptography, but Quantum Computing requires many entangled qubits.
There is no indication how these resonators could produce more than pair-wise entanglement, after all this is very different from the Josephson junction loops that D-Wave and the future Google chip are build on. These allow an arbitrary coupling via the magnetic flux (only restricted by the chip's geometry).
Regrettably, this just yet another poorly written pop-science article not informed by any actual knowledge of quantum information science. If I had a cent for each of them I'd be rich by now.