particles and connections (General)

by David Turell @, Saturday, February 11, 2017, 14:55 (159 days ago) @ dhw
edited by David Turell, Saturday, February 11, 2017, 15:16

Dhw's question: "How do you interact with part of yourself and yet not be present? (“All that IS is God’s creation and a part of him.”)". Lets look at Musser's new article:

https://www.quantamagazine.org/20160119-time-entanglement/?utm_source=Quanta+Magazine&a...

"In 2012, Jay Olson and Timothy Ralph, both physicists at the University of Queensland in Australia, laid out a procedure to encrypt data so that it can be decrypted only at a specific moment in the future. Their scheme exploits quantum entanglement, a phenomenon in which particles or points in a field, such as the electromagnetic field, shed their separate identities and assume a shared existence, their properties becoming correlated with one another’s. Normally physicists think of these correlations as spanning space, linking far-flung locations in a phenomenon that Albert Einstein famously described as “spooky action at a distance.” But a growing body of research is investigating how these correlations can span time as well. What happens now can be correlated with what happens later, in ways that elude a simple mechanistic explanation. In effect, you can have spooky action at a delay.

"These correlations seriously mess with our intuitions about time and space. Not only can two events be correlated, linking the earlier one to the later one, but two events can become correlated such that it becomes impossible to say which is earlier and which is later. Each of these events is the cause of the other, as if each were the first to occur.

***

"To understand entanglement in time, it helps to first understand entanglement in space, as the two are closely related. In the spatial version of a classic entanglement experiment, two particles, such as photons, are prepared in a shared quantum state, then sent flying in different directions.

***

"as though Alice’s particle knew what happened to Bob’s, and vice versa. This is true even when nothing connects the particles — no force, wave or carrier pigeon. The correlation appears to violate “locality,” the rule that states that effects have causes, and chains of cause and effect must be unbroken in space and time.

"In the temporal case, though, the mystery is subtler, involving just a single polarized photon. Alice measures it, and then Bob remeasures it. Distance in space is replaced by an interval of time. The probability of their seeing the same outcome varies with the angle between the polarizers; in fact, it varies in just the same way as in the spatial case. On one level, this does not seem to be strange. Of course what we do first affects what happens next. Of course a particle can communicate with its future self.

***

"The obvious explanation for this result would be if the photon stores both bits and releases one based on Bob’s choice. But if that were the case, you’d expect Bob to be able to obtain information about both bits — to measure both of them or at least some characteristic of both, such as whether they are the same or different. But he can’t. No experiment, even in principle, can get at both bits — a restriction known as the Holevo bound. “Quantum systems seem to have more memory, but you can’t actually access it,” said Costantino Budroni.

***

"So the question of a particle’s supermemory remains a mystery. For now, if you ask why quantum particles produce the strong temporal correlations, physicists basically will answer: “Because.”

***

"Even a perfect vacuum, which is defined as the absence of particles, will still have quantum fields. And these fields are always vibrating. Space looks empty because the vibrations cancel each other out. And to do this, they must be entangled. The cancellation requires the full set of vibrations; a subset won’t necessarily cancel out. But a subset is all you ever see.

***

" In 1976 Bill Unruh, a theoretical physicist at the University of British Columbia, showed that the detection rate goes up if the detector is accelerating, since the detector loses sensitivity to the regions of space it is moving away from. Accelerate it very strongly and it will click like mad, and the particles it sees will be entangled with particles that remain beyond its view.

"In 2011 Olson and Ralph showed that much the same thing happens if the detector can be made to accelerate through time....the particles it picks up will be entangled with particles in a hidden region of time — namely, the future."

See the second chapter


Complete thread:

 RSS Feed of thread

powered by my little forum