## Posts Tagged ‘**symbolic logic**’

## “Reality leaves a lot to the imagination”*…

Here’s a curious thought experiment. Imagine a cloud of quantum particles that are entangled—in other words, they share the same quantum existence. The behavior of these particles is chaotic. The goal of this experiment is to send a quantum message across this set of particles. So the message has to be sent into one side of the cloud and then extracted from the other.

The first step, then, is to divide the cloud down the middle so that the particles on the left can be controlled separately from those on the right. The next step is to inject the message into the left-hand part of the cloud, where the chaotic behavior of the particles quickly scrambles it.

Can such a message ever be unscrambled?

Today, we get an answer thanks to the work of Adam Brown at Google in California and a number of colleagues, including Leonard Susskind at Stanford University, the “father of string theory.” This team shows exactly how such a message can be made to surprisingly reappear.

“The surprise is what happens next,” they say. After a period in which the message seems thoroughly scrambled, it abruptly unscrambles and recoheres at a point far away from where it was originally inserted. “The signal has unexpectedly refocused, without it being at all obvious what it was that acted as the lens,” they say.

But their really extraordinary claim is that such an experiment throws light on one of the deepest mysteries of the universe: the quantum nature of gravity and spacetime…

Quantum entanglement, and what it might tell us about quantum gravity– the fascinating story in full: “How a tabletop experiment could test the bedrock of reality.”

[The *arXiv* paper on which this article reports, “Quantum Gravity in the Lab: Teleportation by Size and Traversable Wormholes,” is here.]

* John Lennon

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**As we contemplate connection,** we might spare a thought for George Boole; the philosopher and mathematician died on this date in 1864. Boole helped establish modern symbolic logic– he created symbols to stand for logical operations– and an algebra of logic (that is now called “Boolean algebra”). Boole made important contributions to the study of differential equations and other aspects of math; his algebra has found important applications in topology, measure theory, probability, and statistics. But it’s for the foundational contribution that his symbolic logic has made to computer science– from circuit design to programming– that he’s probably best remembered.

**Happy Birthday (1894), James Thurber!!**

## Use by…

**James Kendall** and his wife Rosie own and publish * Brighton SOURCE Magazine*. Recently, Rosie’s mother, a 90-year-old widow who lived through the Blitz, gave up her long-time home to move to assisted living. In the process of helping her make the transition, James documented the contents of his mother-in-law’s pantry, and gathered the photos in a collection he calls “

**Best Before…**”

Waste not; want not.

[TotH to **Kottke.org**]

**As we rethink the concept of slow food,** we might wish a systematically-happy birthday to George Boole; the philosopher and mathematician was born on this date in 1815. Boole helped establish modern symbolic logic– he created symbols to stand for logical operations– and an algebra of logic (that is now called “Boolean algebra”). Boole made important contributions to the study of differential equations and other aspects of math; his algebra has found important applications in topology, measure theory, probability, and statistics. But it’s for the foundational contribution that his symbolic logic has made to computer science– from circuit design to programming– that he’s probably best remembered.

## It’s kind of like a Sofia Coppola film…

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Head on over to **Hispster Ipsum** for the coolest of layouts…

**As we affect a posture of amused indifference,** we might wish a symbolically-logical Happy Birthday to mathematician Guiseppe Peano; he was born on this date in 1858. The author of over 200 books and papers, he was a founder of mathematical logic and set theory, to which he contributed much of the symbolic notation still in use.