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Decoding Reality: The Universe as Quantum Information

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1 star:		(5)

 

 

An ambitious book, as it purports to answer nothing less than the ultimate questions of reality: why is there a reality in the first place, and where does it come from? The author intends to provide the ultimate answer to the infinitely recurrent or regressive questions of reality ("How and why did the beginning (of it all) happen ? If the answer is a Big Bang, then whence the Big Bang? If God, then how did God arise, and so forth, ad infinitum")

Does the book succeed ? If it did, it could qualify as nothing short of the greatest advance in physics, or for that matter in any science or philosophy, ever. Let's look at it.

First, a note about style.
The book is divided up in three parts.

The first part is written in a perhaps somewhat overly familar, chatty style, with a sprinkling of oft-lame jokes (e.g. "being insane does not exclude being intelligent, as half of my department can attest to"), overuse perhaps of the words 'I' and 'my', and oversimplifications which, as often happens, muddle up rather than clarify (e.g. " the information content I of an even is inversely proportional to the log of its inverse probability P of occurrence, hence: I= Log (1/P) " . Say again ? This means rather that I= È(ò)* Log (1/P) , where È is some to be defined lump-all function and ò a set of tbd variables. Setting a priori È(ò) to equal 1 is not warranted. Indeed, further on in the text the author examines some of the contributive influencing factors - the È(ò) part of the definition.)

Then there is the constant defining or explanation or rehashs of concepts that in 99% of the cases will be long familiar to the reader. The author is likely not at fault here, editors of popular science books seem to insist these days on simple reminders - however anyone who would read newspapers once in a while, and most definitely anyone who would pick up a book like this, would be familiar with those concepts already and belaboring them at length soon begins to look like padding. Indeed, the author states that if it weren't for redundancies he could have reduced the 200 pages of this book to 25 ! (maybe more like fifty or sixty perhaps by my reckoning.)

The second and third part get more into the meat of the author's argument, and as such the chatty style mostly disappears to give way to more gravitas.

Now everyone carries with them to some extent the bent of what their occupational focus is, and tend to see the world through that bias: rather often what the author labels as being 'information' seems to be semantics rather than substance. For instance, the whole argument about entropy describes exactly what entropy is also according to traditional thermodynamics - whether it be labelled 'information' or 'statistical thermodynamics' or anything else does not really matter at all as long as we understand what the concept describes. Relabelling it 'information', although quite OK, does not contribute substance.

The core of the argument (on page 201) I will not spoil here, but it's not wholly convincing on several grounds. First, although he does not further dwell on it, the author favors the 'Copenhagen' (or observer effect) interpretation of quantum physics, which is used to buttress & underpin his argument. It is however but one of several possible interpretations, not as yet settled as the ultimate interpretation. And some other interpretations would offer different routes to the emergence of reality from nothing. The author's scenario of the role of information as creating reality from information-induced "symmetry breaking ab nihilo" - in other words his argument is that pure nothingness can be bootstrapped into reality from randomly induced information about the nothingness- could be invalidated by other possible interpretations of quantum reality.

Another plank in the author's argument is the accommodation of infinites in a finite reality - an argument that a limited set of laws cannot account for an infinite set of events, some random and some deterministic. Again here - some interpretations of quantum physics would probably gainsay this view.

Overall - a great effort and an intelligent discussion. Whether it contains the smoking gun as to how reality may bootstrap itself - I shall leave to the judgment of other readers.

The principle argument of the book is that information is the fundamental element that constitutes our universe - more fundamental than energy, or its condensed offspring, matter. While this is a large claim, the early part of the book is a delight: a simple and clear introduction to the basics of information theory, elaborated with easy-to-understand examples that only occasionally lead the reader mildly astray. The author outlines why the majority of information-bearing systems in nature tend to be digital (digital encoding requires less energy and is simpler to error-correct) but he ignores important exceptions (phenomenon such as pressure waves are analog).

Major problems with the author's argument soon appear, however. One problem is that Vedral accepts as axiomatic the notion that less common events convey greater amounts of information in consequence of the fact that they are less common. But a moment's reflection suggests that the story cannot be so simple. Less common events do not necessarily contain more information, nor do they necessarily require more information to describe them. Although the author illustrates his idea by talking about how common words are shorter and less common words are longer, it is merely a generalized tendency towards efficiency that has resulted in the inverse log-proportional distribution of word frequency/word length in many (but by no means all) languages. To see why infrequency per se does not imply greater information content, imagine that there is only one kind of car on Earth, but it can come in two colors: blue and red. Out of every ten cars made, nine are blue and one is red. We know therefore that our probability of seeing a red car is 1:10 but it would be absurd to argue that the red car intrinsically contains or represents more information than its blue counterparts. Thus a basic foundation of the author's argument is unsound, and so the reader needs to be somewhat skeptical about the logical structure that is erected thereafter.

Later in the book, Vedral goes on to state - without providing sufficient grounds - that disorder is actually information accumulation, and that entropy is equivalent to information saturation. Presumably the author means that organized systems become disorganized over time as a result of interacting with their environment, and so the disorder is a kind of record of that interaction. But the reader may have two objections. The first objection is that whatever connection is meant is not in fact stated, and the second objection is that if we are correct in guessing the author's intention (that disorder is a record of the system's past interactions with its environment) then the author has just twisted information theory right out of its socket. Information, if the word is to have any meaning, must mean a state that can be "read" to elicit knowledge of that state. Disorder - entropy - is essentially unreadable because it is a jumble of apparently random states. So when the author conflates entropy with information saturation, he seems to be making a very big - and very unjustified - leap. It is one thing to say that the maximum entropic value of a system is equivalent to its maximum information-carrying capacity, but quite another to claim that the two are therefore identical. Additionally, it is probably incorrect to make the claim that the maximum entropic value of a system is in fact equivalent to its maximum information-carrying capacity, because the vast majority of information-carrying systems require some inbuilt error-correcting system, which itself requires information elements (bits, in a binary system) that otherwise would be available for the "message" itself.

Things get worse. When the author moves on to discuss the issue of environmental change, he treats the Earth as though it were a closed system. Thus he accounts for energy conversion into heat, but totally forgets that the Earth radiates most of its heat into space. Instead of an intelligent discussion about the tremendous complexity of environmental systems, we get a schoolboy exegesis that is utterly facile and just silly, and which has nothing whatsoever to do with the central thesis of the book. Even worse comes when the author extrapolates across cosmic timescales. Due to the fact that the sun will end its life by expanding and destroying the inner planets (including our own) some five billion years from now, he concludes that our only hope is to move to other planets. A moment's reflection might indicate that no species we know of lasts for more than a few tens of millions of years so the possibility that anything even vaguely human would still inhabit the Earth five billion years hence is simply ludicrous. A better editor would have insisted on excising sections like this altogether. On the other hand, there are moments of unintentional humor, as when the author tries to talk about food in terms of its entropic value - here I was reminded strongly of Nabokov's novel Pale Fire, in which the insane narrator sees everything through the highly distorting lens of his personal minor obsession and thus "explains" external events in terms of his inner madness. Unfortunately for Vedral, I very much doubt this was the effect he was striving for.

This obsession with explaining absolutely everything in terms of one phenomenon (either entropy or information, depending on the page you happen to be on, as the two are conflated early on and never manage to separate again, like a pair of conjoined twins lacking the presence of a surgeon) basically is the reef upon which Decoding Reality founders. This obsession causes the author continuously to overlook some very basic and obvious problems with his "explanations." For example, he makes an analogy between betting and evolution. This is one of those school-room analogies that, like many analogies, can both shed light and cast shadow. In this case, alas, the latter wins out. The author ends up arguing that as life becomes more elaborate ("increases in entropy") it becomes more difficult for life to propagate. A quick glance out of the window shows this to be utter nonsense. Six hundred million years ago there was no animal life on Earth beyond that contained within the oceans; since then life has also colonized the land and there are literally millions of tiny ecosystems within which different species and sub-species can find a place. But according to Vedral, the opposite should be happening. Which means, of course, that Vedral is too busy paying attention to his idée fix and not spending enough time engaging with the world as it actually is. And that is a shame, because in those places where he is more focused and less expansive in his claims, he conveys ideas clearly and with interest. So all in all this is a curiosity of a book - intended as a thesis about information and reality but in fact being a record of one man's curious obsession through which everything is distorted. By the half-way point I was ready to toss the book into the nearest bin, but persevered in the (alas vain) hope that it would redeem itself at some point. So if you are a connoisseur of oddities and obsessions, this is very much the book for you. But if you are looking for a serious contribution to our knowledge of the universe, you won't find much of help within these pages.

The author attempts to explain the universe as emerging from nothingness based on information.

The book is split into 3 parts,

Firstly an explanation of information theory, which is lightweight but grounded in reality. Along the way he explains how information theory works in different fields, such as biology and financial economics. So far so good.

The second section attempts to explain some macro phenomena as quantum information. Unfortunately this is where the thread starts to unravel. The distinction between quantum bits (qubits) and bits is poorly explained, and then the author steps away from quantum computing to suggest that this may be happening at the molecular level. With almost reckless abandon he tosses off a few references to support his idea. Unfortunately in at least one case, his facts are either wrong or poorly stated. For example p 148: "Biological plant efficiency is super-high, around 98% of the radiation that hits teh leaf does get stored efficiently." This nonsense, as the plant would be almost non-reflective and appear quite dark, an obvious error that defies common sense and albedo measurements. Perhaps he meant 98% of the absorbed visible radiation that is trapped by chlorophyll?

The last part just goes off into la-la land as speculative philosophy. It may be that the universe is a quantum computer and it may be that information is fundamental to the universe, but the evidence presented is effectively non-existant. The edifice, like much of philosophy is built on logic, not on experimental data, without obvious testable hypotheses (at least as presented to the reader). The end result reads like mysticism, much like Fritjof Capra's works.

Overall this book tried, in a short volume, to explain quantum information, how it may be applied in the universe and ultimately as an explanation of the existence of the universe itself. After rambling through ever more speculative ideas, the books founders, failing to deliver much of substance.

If you are a person that, like me, religiously follows the recommendations of the Books Section in The Economist, you may be tempted to purchase this book. Don't. This book is a complete disappointment from beginning to end. All examples are either oversimplified or too confusing to follow. Sometimes they are just plain inaccurate, as some of the other reviewers have already outlined.

I just wish I could give another bad review to the columnist in The Economist that recommended this book. Alas...

I did read the whole book. I do have a college degree and some knowledge of both physics and information theory. The author circles incoherently and by the end is just spewing words. The "Key Points" at the end of each chapter sum it up, they reek of an editor trying to bring sense and progress to amorphous blobs of essays. You will learn nothing from this at all.

Decoding Reality: The Universe as Quantum Information
The book is a somewhat confused, and confusing, poutpurri of perfunctory flashes about the implementation of information theory, or just the very "information" notion, in several fields of science and/or society. The background of the Author is indubitable; is he really so cunning as to fully assimilate his own culture? Mainly, his committal to answer the question "Why is there something rather than nothing" avoiding cyrcular arguments is not fulfilled. In fact, in the end, he states: "The universe starts empty, but potentially with a huge amount of information" (page 211). This is, to me, already a "law a priori", a very convolute one involving the idea of "information". Where does it come from? Then, he puts into action "two arrows", which is just a different way to say "two more laws", and in a few, confusing statements,gets the rabbit out from the hat. As an elderly and experienced theoretical astrophysicist, I claim that this is not how we do science. I found the book useless, in the best. And forgive me for my poor English; I am not a mother-language reader (even if I am a very good reader).

On page 50, the author states that since his book, "like the genetic code, is intended to convey some information, you may wonder what its redundancy is. The answer I calculated, using Shannon's entropy from Chapter 1 is 7.4. This means that instead of writing my message in 200 pages, I probably could have summarized everything I wanted to say in 25 pages."

Would that he had! This book is nearly devoid of any (meaningful) information. Instead it reads like first drafts of several disconnected lectures pompously strung together with little stories about how great and wonderful the author is. Save your money. For a truly well written and useful introduction to the way in which information theory holds the key to understanding "everything in the cosmos, from our brains to black holes," read Charles Seife's "Decoding the Universe" instead.

I don't know anything about quantum information, so I will take the book jacket's word that Dr. Vedral is qualified and an eminent scientist.

However, that expertise is not apparent in this book. It does not explain any individual topic well enough for anyone (even a very smart person) to understand it. I know this because I am quite familiar with one or two of the (many) topics discussed and in those instances it seemed that Dr. Vedral either oversimplifying or simply doesn't know what he is talking about.

For instance, on p140 of my version, he writes that an ATM multiplies your 4 digit PIN with a 500 digit number, and it is this 504 digit number which gets transferred. This is secure, he states, because factoring this number would take longer than the age of the universe. But couldn't you simply divide the 504 digit number by all the 4 digit numbers? The PIN would then have to be one of the 4 digit numbers that evenly divided it. Is there some subtle point here that's not mentioned? Or was there a simple editing mistake? Or is this whole ATM bit just BS? The reader not familiar with the subject cannot tell. To take two other examples, Vedral breezes over Popperian falsificationism and Kolmogorov complexity theory without hinting at the extreme philosophical or practical difficulties that beset these two ideas.

To summarize, no one could learn anything significant from this book. I'm sure Vedral is extremely distinguished, but this book reads like it was written by a dilettante who went down a list of 50 fascinating topics and spent 30 minutes learning about each of them.

Such a great title and promise, and yet offers zero insight and significance. If you already know about quantum and information theories, you won't learn anything new (worse you get frustrated by inconsistencies, misrepresentations, ungrounded conclusions, etc). And if you don't know these theories, you would be misguided. For serious discussions on these topics, I would recommend Information and the Nature of Reality.

Vlatko Vedral is a university professor who takes an interesting idea in his book, and never really explores it. He presents a couple of interesting ideas, then constantly digresses. Not once did I find he fulfilled any promise to discuss or prove any idea presented in the book. Often, examples turned into self ingratiating facts about himself. I suspect the intention behind writing this book fulfilled a need to get another work published, and was sorely dissapointing. I will definitely be on the look for a good book on quantum information theory written by a skilled author, but will certainly avoid any more of Vedral's.