Quantum Entanglement (Essential Knowledge)

Quantum Entanglement (Essential Knowledge) - Jed Brody ****

An entry in MIT Press's pocket-sized Essential Knowledge series, this is an attempt to take on one of the strangest and most mind-bending aspects of physics - quantum entanglement - in a new way.

There are several books describing the historical development and implications of quantum entanglement, but what Jed Brody does is take an experimentalist's view and helps the reader understand what is involved in a Bell inequality and how a test of quantum entanglement in this fashion really works.

There are other bits as well - a very rapid introduction and a rather tagged-on feeling bit about quantum theory and relativity, plus a too-brief-to-understand trip into the unlikely world of quantum Bayesianism. But the crucial part of the book, and the reason it gets four stars, is that experimental bit. Specifically what Brody does, something that I have never seen before in any other book on the subject, is give an explanation of a specific Bell inequality that proves why the outcome of a particular measurement runs counter to local realism - that's a real achievement. Usually, the best that can be done is to tell the reader such an experiment will prove the outcome without explaining why.

There is one big proviso. I think this is a great book if you have already picked up the background to quantum entanglement (try The God Effect for this, rather than Brody's 'further reading' recommendations), but it really wouldn't be so useful if you haven't absorbed the context, history and meaning - so if the bits of the review above referring to a Bell inequality, say, don't mean a lot to you, do some background reading first.

Even with that background, some of the later examples that Brody gives involve just too much twisted logic to easily get your brain around - but I still think that the relatively small part of the book that involves working through a basic Bell inequality is well worth laying your hands on it, and make this title unique.

Definitely one of the better additions to this quirky series.

Paperback:

Kindle:

Using these links earns us commission at no cost to you

Review by Brian Clegg

Comments

God: the Science, the Evidence - Michel-Yves Bolloré and Olivier Bonnassies ***

This is, to say the least, an oddity, but a fascinating one. A translation of a French bestseller, it aims to put forward an examination of the scientific evidence for the existence of a deity… and various other things, as this is a very oddly structured book (more on that in a moment). In The God Delusion , Richard Dawkins suggested that we should treat the existence of God as a scientific claim, which is exactly what the authors do reasonably well in the main part of the book. They argue that three pieces of scientific evidence in particular are supportive of the existence of a (generic) creator of the universe. These are that the universe had a beginning, the fine tuning of natural constants and the unlikeliness of life. To support their evidence, Bolloré and Bonnassies give a reasonable introduction to thermodynamics and cosmology. They suggest that the expected heat death of the universe implies a beginning (for good thermodynamic reasons), and rightly give the impression tha...

Humble Pi - Matt Parker ****

Matt Parker had me thoroughly enjoying this collection of situations where maths and numbers go wrong in everyday life. I think the book's title is a little weak - 'Humble Pi' doesn't really convey what it's about, but that subtitle 'a comedy of maths errors' is far more informative. With his delightful conversational style, honed in his stand-up maths shows, it feels as if Parker is a friend down the pub, relating the story of some technical disaster driven by maths and computing, or regaling us with a numerical cock-up. These range from the spectacular - wobbling and collapsing bridges, for example - to the small but beautifully formed, such as Excel's rounding errors. Sometimes it's Parker's little asides that are particularly attractive. I loved his rant on why phone numbers aren't numbers at all (would it be meaningful for someone to ask you what half your phone number is?). We discover the trials and tribulations of getting cal...

Quantum 2.0 - Paul Davies ****

Unlike the general theory of relativity or cosmology, quantum physics is an aspect of physics that has had a huge impact on everyday lives, particularly through the deployment of electronics, but also, for example, where superconductivity has led to practical applications. But when Paul Davies is talking about version 2.0, he is specifically describing quantum information, where quantum particles and systems are used in information technology. This obviously includes quantum computers, but Davies also brings in, for example, the potential for quantum AI technology. Quantum computers have been discussed for decades - algorithms had already been written for them as early as the 1990s - but it's only now that they are starting to become usable devices, not at the personal level but in servers. In his usual approachable style, Davies gives us four chapters bringing us up to speed on quantum basics, but then brings in quantum computing. After this we don't get solid quantum informat...

Search This Blog