Ebook , by Dr Andrew H Thomas
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, by Dr Andrew H Thomas
Ebook , by Dr Andrew H Thomas
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Product details
File Size: 3715 KB
Print Length: 191 pages
Simultaneous Device Usage: Unlimited
Publication Date: August 20, 2018
Sold by: Amazon Digital Services LLC
Language: English
ASIN: B07GPRBYVC
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Amazon Best Sellers Rank:
#50,459 Paid in Kindle Store (See Top 100 Paid in Kindle Store)
Dr. Thomas takes us on an intriguing journey into the quantum realm in this latest installment of the Hidden in Plain Sight series. The first several chapters are an introduction to quantum mechanics, covering the concept of a quantum state in two-dimensional Hilbert space, the evolution of the quantum state over time, and the action of an operator on a quantum state to reveal a particular eigenstate (i.e., the act of measurement).Following this rather brief review, Dr. Thomas compares Boolian logic, which forms the basis of ordinary, classical computers using bits (0 or 1), with quantum logic using qubits, which can exist in a state superposition (0 and 1). It turns out that Boolian operations are irreversible. For example the input bits of a universal NAND gate cannot be uniquely determined from the single output bit, so Boolian logic thus results in a loss of certainty, which can be equated to an increase in entropy in the forward direction. In contrast, the evolution of a quantum state must be time-reversible (no increase in entropy can occur in the forward direction), restricting the kinds of logic gates that can be used in a quantum computer. Only those gates where the input states can be uniquely determined from the output states, such as the CCNOT gate, can be used. This restriction makes quantum algorithms seem somewhat clumsy compared to their Boolian counterparts, but it becomes clear that this is only a minor disadvantage compared to the huge advantage quantum computation provides in terms of massive parallel processing power, which can increase exponentially with the number of qubits that are employed.The Kindle version of the book provides links to videos prepared by Dr. Thomas, which illustrate how to set up simple quantum algorithms using IBM's on-line 5-qubit simulator. These videos provide extremely valuable demonstrations on how to set up and use this amazing hands-on tool.I've gained a lot more understanding and many more insights about quantum computing from this book than any other sources I've read to date. I must say that the final chapter covering the implementation of Grover's algorithm may prove to be hard to grasp -- it was for me at least-- but otherwise the book is quite suitable for a general audience. I have one small criticism: there are Kindle formatting errors involving exponential expressions like 2^N and 2^64 are shown as 2N and 264. This seems to be a common bug when converting text documents into ePub type format.I highly recommend buying this book. It is quite concise and it can easily be absorbed in a couple of sittings; even so, Dr. Thomas provides all the information necessary to gain a basic understanding of how quantum computers work and an appreciation of their potential power. His entire presentation is in clear, everyday language. Five stars.
The author directs us to the "IBM Quantum Experience" site, but its user-nasty design makes me wonder if IBM should learn basic web development first, and THEN put up a quantum computer site. One irritant after another... do I really have to re-accept the cookies policy every time I log on? Have they heard of the "contact us" concept for people having trouble that is not covered in the FAQ? The browser’s back arrow - what is it for? Apparently IBM does not know. Nothing more irritating than a right-click on back arrow and seeing a drop down populated with a dozen copies of the current page URL, which means you can click forever and you aren’t going anywhere.
Thomas continues with some cool quantum physics writing. This guy knows how to get to the meat, and make the edges of current knowledge seem familiar and comfortable. He is pouring out the pages these days and I did see a little repetition seep into this outing. His editor is obviously having a tough time keeping up with him. The formatting of the exponentials is incorrect, but the true values are clear with a moment's thought.In this book, he shows how Grover's algorithm can search through many possibilities in parallel to find a desired entry among the qubits in superposition. But he also clearly shows why that is essentially useless in practice since the "desired" state must be specially marked. And to know which state should be specially marked requires already knowing the answer. No surprise it's fast when you must have already solved the problem before you can even set up the gates!Of course the setup is faster to give values to quantum experiments than the current state of the art which is simulation at a massive number of lattice points requiring huge piles of calculation. The Grover's probe can be hooked directly to the output of the quantum system to read out the answers--like a high tech voltmeter for reading analog signals. But as a general computer, not yet useful.This explains why Microsoft and IBM are putting their quantum machines online: they are desperately hoping someone from the information theory side will come up with something to make these things relevant for actual algorithms people use.I would also like to correct some of the other reviews that say this book gives you the info to program an online quantum computing simulator: No, the actual quantum computer is online and accepting jobs. Simulators are available, but this book will get you to the point of running programs on actual, extant quantum hardware.
I liked this book because it brings information straight to the point, and a lot of interesting information. It's small and has all information you expect it to have for beginners, who never dealt with a quantum computer and like me, who will never work with it, but has the curiosity to know how it works.
... Let alone easily performed in the comfort of your own (wherever you are) using your own (whatever computing appliance you possess—even an iPhone!) This amazing science Andrew makes simple enough for those of us is without graduate degrees in physics to comprehend, yet an informative introduction for those with advanced degrees, or IT pros... or storytellers, like me!
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