Researchers Entangle Light Beam With Glass Bead, Ars Technica Reports
Ars Technica reports that a group of researchers entangled a light beam with a glass bead, an achievement the publication describes as an experimental tour-de-force.
According to Ars Technica, quantum entanglement is the idea that if two objects are linked, their behavior will in some ways be correlated. The article used the relationship between a person's upper and lower arm as an analogy: because they are connected at the elbow, their relative positions are strongly correlated, and no one finds this surprising because the arm is visibly a single object.
Two photons can also be joined in a sense, meaning they can have correlations, the report said. The article cited several reasons people are naively surprised by this. One reason, the report said, is that people think of photons as separate objects that cannot be joined, which it called a mistake of understanding. Another is that when two photons are connected, they are connected only in limited ways.
Ars Technica gave one example of those limits: two photons may be wholly uncorrelated in terms of polarization while being strongly correlated in terms of energy.
The report also addressed the language often used for entanglement. It said writing about the subject is always a challenge because of clichés such as mysterious, ghostly, spooky, and weird. It said entanglement is none of those things and yet also all of those things, a superposition of clichés.
Editor's Summary A group of researchers has entangled a light beam with a glass bead, according to Ars Technica, which called the work an experimental tour-de-force and quite an achievement. The report explains entanglement as correlation between linked objects and says two photons can be joined in limited ways, such as strong energy correlation with no polarization correlation. The available excerpt does not provide further details about the experimental method or the team.