Kvantfysik
6 947 produkter
6 947 produkter
Pocket, Svenska, 2023
89 kr
Våra kroppar är uppbyggda av biljoner mikroskopiska celler, och i cellernas innersta värld gäller kvantfysikens lagar. Kvantfysiken beskriver hur fåglarna hittar hem över tusentals kilometer och hur en ödla kan hänga upp och ner i taket. Kvantfysiken förklarar också fotosyntesen som är grunden för allt liv på jorden den process som ger en maskros kraften att spränga genom asfalten.
I kvantfysikens värld kan en partikel befinna sig på många ställen vid samma tidpunkt. Den kan förflytta sig genom att välja alla vägar mellan två punkter - samtidigt. Och information kan se ut att färdas över stora avstånd utan att det tar någon tid alls. I den mikroskopiska världen kan det se ut som att naturens lagbundenhet faller samman till osäkerhet och slump bara genom att man tittar på den. Men det är faktiskt inte sant den följer bara andra lagar: kvantfysikens skenbart paradoxala vägar i atomernas och molekylernas värld.
Kvantfysiken är också nyckeln till att förstå den genetik och biokemi som till slut förklarar hur vår kropp och vårt medvetande fungerar och kan påverkas. Kunskapen om kvantfysikens betydelse för medicin och biologi kan göra det möjligt att diagnosticera och behandla sjukdomar på nya sätt, och kanske i framtiden besvara de verkligt svåra frågorna hur uppstod och utvecklades livet på jorden?
Inbunden, Svenska, 2022
248 kr
»Möt den nya Stephen Hawking«– The Sunday Times
Världen består inte av individuella objekt utan av relationer.
Sedan kvantteorin formulerades har den förändrat vår förståelse av verkligheten i grunden. Men den motsägelsefulla världsbild som framträdde var så gåtfull att fysiker lade frågan om kvantfysikens innebörd åt sidan i över ett halvsekel.
I Helgoland ger Carlo Rovelli gåtan ett svar som är lika elegant som omvälvande. Han visar fram en annan och mer nyanserad verklighet än den som är grundad i elementarpartiklarnas schematiska materialism. En verklighet vars fundamentala grammatik stavas processer, händelser – och relationer.
Inbunden, Svenska, 2024
153 kr
Ibland är det enkla faktiskt bäst. Den här smarta guiden förklarar den moderna vetenskapens förbryllande värld. Texterna är korta och informativa och följs åt av pedagogiska bilder så att du snabbt kan få grepp om allt från tankeexperimentet med Schrödingers katt till kvantteleportering.
Oavsett om du pluggar naturvetenskap, vill friska upp minnet, bredda din allmänbildning eller briljera i sociala sammanhang är Kvantfysik på 1 minut fullspäckad med allt du behöver för att snabbt och enkelt förstå kvantfysikens grunder.
Häftad, Engelska, 2022
125 kr
Skickas
'A majestic story' David Bodanis, Financial Times From the international bestselling author of Physics of the Impossible and Physics of the FutureThis is the story of a quest: to find a Theory of Everything. Einstein dedicated his life to seeking this elusive Holy Grail, a single, revolutionary 'god equation' which would tie all the forces in the universe together, yet never found it. Some of the greatest minds in physics took up the search, from Stephen Hawking to Brian Greene. None have yet succeeded.In The God Equation, renowned theoretical physicist Michio Kaku takes the reader on a mind-bending ride through the twists and turns of this epic journey: a mystery that has fascinated him for most of his life. He guides us through the key debates in modern physics, from Newton's law of gravity via relativity and quantum mechanics to the latest developments in string theory. It is a tale of dazzling breakthroughs and crushing dead ends, illuminated by Kaku's clarity, storytelling flair and infectious enthusiasm.The object of the quest is now within sight: we are closer than ever to achieving the most ambitious undertaking in the history of science. If successful, the Theory of Everything could simultaneously unlock the deepest mysteries of space and time, and fulfil that most ancient and basic of human desires - to understand the meaning of our lives.
Häftad, Engelska, 2015
141 kr
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'Quantum mechanics for real. This is the good stuff, the most mysterious aspects of how reality works, set out with crystalline clarity. The place to start' Sean Carroll, physicist, California Institute of Technology, author of The Particle at the End of the UniverseThis is the ultimate practical introduction to quantum mechanics. World-renowned physicist Leonard Susskind and data engineer Art Friedman give you the basic skills you need to tackle this famously difficult topic yourself.They provide clear, lively explanations of basic concepts, introduce the key fields of quantum mechanics and include step-by-step exercises. Making a complex subject 'as simple as possible, but no simpler', this is a practical toolkit for amateur scientists that you won't find anywhere else.
Inbunden, Engelska, 2018
761 kr
Skickas inom 7-10 vardagar
Changes and additions to the new edition of this classic textbook include a new chapter on symmetries, new problems and examples, improved explanations, more numerical problems to be worked on a computer, new applications to solid state physics, and consolidated treatment of time-dependent potentials.
Häftad, Engelska, 2025
126 kr
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THE NEW YORK TIMES BESTSELLER‘Neat, and extremely simple: only a deep thinker such as Sean Carroll could introduce the complexity of Einstein’s general relativity in such a luminous and straightforward manner.’Carlo Rovelli, author of Seven Brief Lessons on PhysicsImmense, strange and infinite, the world of modern physics often feels impenetrable to the undiscerning eye – a jumble of muons, gluons and quarks, impossible to explain without several degrees and a research position at CERN.But it doesn’t have to be this way!Allow world-renowned theoretical physicist and bestselling author Sean Carroll to guide you through the biggest ideas in the universe. Elegant and simple, Carroll unravels a web of theory to get to the heart of the truths they represent about the world around us.—In Quanta and Fields, the second in this landmark trilogy, Carroll delves into the baffling and beautiful world of quantum mechanics. From Schrödinger to Feynman, Carroll travels through the quantum revolution with the greatest minds of the twentieth century. Exploring how several decades of research overturned centuries of convention, Carroll provides a dazzling tour of the most exciting ideas in modern science.
Inbunden, Svenska, 2024
329 kr
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Kvantfysikens fader, Max Planck, hamnade mitt i den spricka som nazisterna rev upp mellan civilisation och barbari, vetenskap och terror, sanning och lögn. På grund av sina nära band till judiska vänner och kolleger, fick Max Planck se de flesta av sina arbeten förstöras och sitt namn ställas på glömskans rand under andra världskriget. Men lyckligtvis bevarades en stor del av hans brev för eftervärlden. Där finns bland annat den viktiga korrespondensen med vännen och kollegan Albert Einstein, liksom Plancks vädjanden till Hitler om att skona hans son från döden.
I Brandon Browns prisbelönta biografi får vi följa den visionära fysiker som kom att skissera de grundläggande formlerna för kvantteorin och som tilldelades Nobelpriset 1918. Föga anande man att den vetenskapsnation som han företrädde skulle komma att falla samman, och en grym epok i Tysklands historia ta sin början.
Häftad, Engelska, 2023
137 kr
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A Brief History of Time for the 21st CenturyAt the heart of our galaxy lies a monster so deadly, not even light can escape its grasp. Its secrets lie waiting to be discovered. It’s time to explore our universe’s most mysterious inhabitantsBlack Holes At the heart of the Milky Way lies a supermassive black hole 4 million times more massive than our Sun. A place where space and time are so warped that light is trapped if it ventures within 12 million km. According to Einstein, inside lies the end of time. According to 21st-century physics, the reality may be far more bizarre. Black holes lie where the most massive stars used to shine and at the edge of our current understanding. They are naturally occurring objects, the inevitable creations of gravity when too much matter collapses into not enough space. And yet, although the laws of nature predict them, they fail fully to describe them.Black holes are places in space and time where the laws of gravity, quantum physics and thermodynamics collide. Originally thought to be so intellectually troubling that they simply could not exist, it is only in the past few years that we have begun to glimpse a new synthesis; a deep connection between gravity and quantum information theory that describes a holographic universe in which space and time emerge from a network of quantum bits, and wormholes span the void.In this groundbreaking book, Professor Brian Cox and Professor Jeff Forshaw take you to the edge of our understanding of black holes; a scientific journey to the research frontier spanning a century of physics, from Einstein to Hawking and beyond, that ends with the startling conclusion that our world may operate like a giant quantum computer.
Häftad, Engelska, 2021
142 kr
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Quantum physics is not mystifying. The implications are mind-bending, and not yet fully understood, but this revolutionary theory is truly illuminating. It stands as the best explanation of the fundamental nature of our world.‘An authoritative and beautifully written account of the quest to understand quantum theory and the origin of space and time.’ Professor Brian Cox Spanning the history of quantum discoveries, from Einstein and Bohr to the present day, Something Deeply Hidden is the essential guide to the most intriguing subject in science. Acclaimed physicist and writer Sean Carroll debunks the myths, resurrects and reinstates the Many-Worlds interpretation, and presents a new path towards solving the apparent conflict between quantum mechanics and Einstein’s theory of general relativity. In doing so, he fills a gap in the science that has existed for almost a century.A magisterial tour, Something Deeply Hidden encompasses the cosmological and everyday implications of quantum reality and multiple universes. And – finally – it all makes sense.***'Carroll takes us by the hand and with a benign smile and a chatty style, leads us to a place where… at every instant an almost infinite number of copies of you are splitting off to live alternative lives… a wild conceptual ride.' The Sunday Times, BOOKS OF THE YEAR'Like all great writers, Carroll has the remarkable ability of putting the reader utterly at ease with his lucid and addictive prose. He leads you so gently and comfortably into his quantum world that you quickly forget you are being given access to the most profound ideas about the nature of reality.' Jim Al-Khalili'Sean Carroll’s immensely enjoyable Something Deeply Hidden brings readers face-to-face with the fundamental quantum weirdness of the universe – or should I say universes? And by the end, you may catch yourself finding quantum weirdness not all that weird.' Jordan Ellenberg
Inbunden, Svenska, 2023
273 kr
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I en fuktig tunnel under Donaufloden och i den varma luften mellan två kanarieöar utfördes i början av millenniet experiment som kastade nytt ljus över kvantmekanikens mysterier. Med hjälp av sammanflätade fotoner lyckades Anton Zeilinger tillsammans med sina kolleger överföra kvantegenskaper mellan partiklar på stora avstånd. Fenomenet som kommit att kallas kvantteleportering öppnar för oanade sätt att lagra och överföra information. En ny era av teknologiska genombrott står för dörren.
Som en pedagogisk introduktion till kvantfysikens värld ger den här boken berättelsen om den vetenskapliga upptäckt som skulle leda hela vägen till 2022 års Nobelpris i fysik.
Med ett förord av Ulf Danielsson.
Häftad, Engelska, 2024
119 kr
Skickas inom 5-8 vardagar
With a rare blend of scientific insight and writing as graceful as the theories it so deftly explains, The Elegant Universe remains the unrivaled account of the modern search for the deepest laws of nature: “a standard that will be hard to beat” (George Johnson, New York Times Book Review). In this new 25th anniversary edition, renowned physicist and author Brian Greene—“the single best explainer of abstruse concepts in the world today” (Washington Post)—updates his classic work with a new preface and epilogue summarizing the significant theoretical and experimental developments over the past quarter-century. From established science, including relativity and quantum mechanics, to the cutting edge of thinking on black holes, string theory, and quantum gravity, The Elegant Universe makes some of the most sophisticated concepts ever contemplated thoroughly accessible and entertaining, bringing us closer than ever to comprehending how the universe works.
Storpocket, Svenska, 2026
263 kr
Skickas inom 3-6 vardagar
Kvantfysik är ett svårt ämne och denna bok vill reda ut underliga och misstänkt felaktiga resonemang. För det första är verklighetsbegreppet ofta förvirrat. Det är meningslöst att tala om vad som händer innan en mätning görs. Ett exempel är det s.k. ”Schrödingers katt”. Att tilldela exemplet en superposition – katten är både död och levande – är utom mening. Georg cantor söker ’bevisa’ att reella talmängden är större än den naturliga. Intuitivt förstår vi det, men Cantors ’bevis’ håller inte. Kurt Gödels ofullständighetsbevis för aritmetiken och en nedgörande kritik av formalismen, bygger på klasssisk logik, men gör sig skyldig till ett flagrant missbruk av denna logik.
Häftad, Engelska, 2022
142 kr
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The instant Sunday Times bestseller -- a beautiful story of rebellion and science'A triumph. . . We are left in a world that is not disenchanted by science, but even more magical' Financial TimesIn June 1925, twenty-three-year-old Werner Heisenberg, suffering from hay fever, had retreated to the treeless, wind-battered island of Helgoland in the North Sea in order to think. Walking all night, by dawn he had wrestled with an idea that would transform the whole of science and our very conception of the world.In Helgoland Carlo Rovelli tells the story of the birth of quantum physics and its bright young founders who were to become some of the most famous Nobel winners in science. It is a celebration of youthful rebellion and intellectual revolution. An invitation to a magical place.Here Rovelli illuminates competing interpretations of this science and offers his own original view, describing the world we touch as a fabric woven by relations. Where we, as every other thing around us, exist in our interactions with one another, in a never-ending game of mirrors.A dazzling work from a celebrated scientist and master storyteller, Helgoland transports us to dizzying heights, reminding us of the many pleasures of the life of the mind.Translated by Erica Segre and Simon CarnellChosen as a Book of the Year by The Times, Financial Times, Sunday Times, Guardian and ProspectShortlisted for the Nayef Al-Rodhan Prize
Häftad, Engelska, 2015
141 kr
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In Our Mathematical Universe, Max Tegmark, one of the most original physicists at work today, leads us on an astonishing journey to explore the mysteries uncovered by cosmology and to discover the nature of realityPart-history of the cosmos, part-intellectual adventure, Our Mathematical Universe travels from the Big Bang to the distant future via parallel worlds, across every possible scale - from the sub-atomic to the intergalactic - showing how mathematics provides the answers to our questions about the world. Where do we come from? What makes the universe the way it is? In essence, why are we here? With dazzling clarity, Max Tegmark ponders these deep mysteries and allows us to grasp the most cutting-edge and mind-boggling theories of physics. What he proposes is an elegant and fascinating idea: that our physical world not only is described by mathematics, but that it is mathematics. 'Our Mathematical Universe is nothing if not impressive. Brilliantly argued and beautifully written, it is never less than thought-provoking about the greatest mysteries of our existence' - New York Times 'An amazing ride through the rich landscape of contemporary cosmology... Physics could do with more characters like Tegmark... an imaginative intellect and a charismatic presence' - Clive Cookson, Financial Times Max Tegmark is author or co-author of more than 200 technical papers, twelve of which have been cited more than 500 times. He has featured in dozens of science documentaries, and his work with the SDSS collaboration on galaxy clustering shared the first prize in Science magazine's "Breakthrough of the Year: 2003". He holds a Ph.D from the University of California, Berkeley, and is a physics professor at MIT.
Inbunden, Svenska, 2020
306 kr
Skickas inom 5-8 vardagar
Världen beskrivs på grundläggande nivå av partikelfysik och kvantmekanik. Det är förståeligt nog ämnen som fascinerar många. De har ett rykte om sig att vara matematiskt komplicerade, vilket är helt sant. Behandlingen i gymnasiet tenderar därför att bli icke-matematisk, vilket är synd. Eleverna missar då den djupare förståelsen av fysiken och får inte upptäcka hur mycket av den matematik de lärt sig som behövs för att förstå världen. Gymnasiets naturvetenskapliga program innehåller mycket matematik. Idén bakom boken är att visa hur djup förståelse vi kan få om universums grundläggande lagar genom att använda så mycket som möjligt av denna matematik. Boken riktar sig till intresserade gymnasieelever och lärare. Den kan även vara intressant för personer som lämnat gymnasiet, men minns sin gymnasiematematik. Den kan användas som kurslitteratur till kurserna matematik specialisering eller naturvetenskaplig fördjupning. Erik Thomé är doktor i fysik vid Uppsala universitet. Han arbetar nu som gymnasielektor i fysik, matematik och filosofi på Öresundsgymnasiet Landskrona.
Inbunden, Engelska, 2025
344 kr
Skickas inom 3-6 vardagar
Häftad, Engelska, 2008
126 kr
Skickas
Stephen Hawking's worldwide bestseller, A Brief History of Time, has been a landmark volume in scientific writing. Its author's engaging voice is one reason, and the compelling subjects he addresses is another: the nature of space and time, the role of God in creation, the history and future of the universe. But it is also true that in the years since its publication, readers have repeatedly told Professor Hawking of their great difficulty in understanding some of the book's most important concepts. This is the origin of and the reason for A Briefer History of Time: its author's wish to make its content accessible to readers - as well as to bring it up-to-date with the latest scientific observations and findings.Although this book is literally somewhat 'briefer', it actually expands on the great subjects of the original. Purely technical concepts, such as the mathematics of chaotic boundary conditions, are gone. Conversely, subjects of wide interest that were difficult to follow because they were interspersed throughout the book have now been given entire chapters of their own, including relativity, curved space, and quantum theory.This reorganization has allowed the authors to expand areas of special interest and recent progress, from the latest developments in string theory to exciting developments in the search for a complete, unified theory of all the forces of physics. Like prior editions of the book-but even more so - A Briefer History of Time will guide nonscientists everywhere in the ongoing search for the tantalizing secrets at the heart of time and space.Thirty-eight full-colour illustrations enhance the text and make A Briefer History of Time an exhilarating addition in its own right to the literature of science.
224 kr
Skickas inom 3-6 vardagar
Inbunden, Engelska, 2025
255 kr
Skickas
An acclaimed physicist signposts a new revolution in fundamental physics, and with it a new description of realityFor the last century, physics has been following the paths set out by the same two theories—quantum mechanics and general relativity—and, let’s face it, it’s getting pretty boring. Despite these great theories being fundamentally in conflict, most scientists are simply chasing decimal points in laboratories. To give the deeper explanation of reality we seek, we need new ways to explore and critique our best ideas of the universe on the smallest and largest scales.The situation is much like that in 1890, right before Planck, Einstein and Bohr blew the roof off Newtonian physics. As Vlatko Vedral argues in Portals to a New Reality, this suggests we are on the brink of a new revolution. Vedral first explains the state of the art of our current understanding when it comes to quantum mechanics and general relativity. Then he shows how quantum information theory has opened up radical new avenues, giving us a series of extraordinary experiments that could upend physics. They can sound very strange—one essentially involves entangling a human with Schrödinger’s cat—but they lay bare the elements of our theories that are particularly problematic, such as the widespread belief that nothing truly exists unless it is observed.At present these take the form of fascinating thought experiments, but nothing, save inertia and a lack of ambition, stands in our way. This revolution has been a century in the making—the time has finally arrived to rewrite our understanding of the universe.
Häftad, Engelska, 2014
170 kr
Skickas inom 5-8 vardagar
Häftad, Engelska, 2024
146 kr
Skickas
An exhilarating guide to the astonishing future of quantum computing, from the international bestselling physicistThe runaway success of the microchip processor may be nearing its end, with profound implications for our economy, society and way of life, even leaving Silicon Valley as a new Rust Belt, its technology obsolete. Step forward the quantum computer, which harnesses the power and complexity of the atomic realm, and may be useful in solving humanity's greatest challenges from climate change, to global starvation, to incurable diseases. Humanity's next great technological achievement already promises to be every bit as revolutionary as the transistor and microchip once were. Its unprecedented gains in computing power and unique ability to simulate the physical universe herald advances that could change every aspect of our lives.Corporations and whole nations are betting on quantum computing, hoping to exploit its power to design more efficient vehicles, create life-saving new drugs and streamline industries to revolutionize the economy. But this is only the beginning. Quantum computers could allow us to finally create nuclear fusion reactors that produce clean, renewable energy without radioactive waste or threats of meltdown. They could help us crack the biological processes that generate natural, cheap fertilizer and enable us to feed the world's growing populations. And they could unravel the fiendishly difficult protein folding that lies at the heart of previously incurable diseases such as Alzheimer's, motor neurone disease and Parkinson's, helping us to live longer, healthier lives. Told with Kaku's signature clarity and enthusiasm, Quantum Supremacy is the story of this exciting frontier and the race to claim humanity's future.
Häftad, Engelska, 2024
231 kr
Skickas inom 5-8 vardagar
The plain-English guide to understanding quantum physics Mastering quantum physics is no easy feat, but with the help of Quantum Physics For Dummies you can work at your own pace to unlock key concepts and fascinating facts. Packed with invaluable explanations, equations, and step-by-step instructions, this book makes a challenging subject much more accessible. Great for college students taking a quantum physics course, Quantum Physics For Dummies offers complete coverage of the subject, along with numerous examples to help you tackle the tough stuff. The Schrodinger Equation, the foundations of quantum physics, vector notation, scattering theory, angular momentum—it’s all in here. This handy guide helps you prepare for exams and succeed at learning quantum physics. Get clear explanations of the core concepts in quantum physics Review the math principles needed for quantum physics equationsLearn the latest breakthroughs and research in the fieldClarify difficult subjects and equations from your college courseQuantum Physics For Dummies is great a resource for students who need a supplement to the textbook to help them tackle this challenging subject.
Inbunden, Engelska, 2026
316 kr
Skickas inom 3-6 vardagar
Häftad, Engelska, 2019
140 kr
Skickas inom 5-8 vardagar
Every physicist agrees quantum mechanics is among humanity's finest scientific achievements. But ask what it means, and the result will be a brawl. For a century, most physicists have followed Niels Bohr's Copenhagen interpretation and dismissed questions about the reality underlying quantum physics as meaningless. A mishmash of solipsism and poor reasoning, Copenhagen endured, as Bohr's students vigorously protected his legacy, and the physics community favoured practical experiments over philosophical arguments. As a result, questioning the status quo long meant professional ruin. And yet, from the 1920s to today, physicists like John Bell, David Bohm, and Hugh Everett persisted in seeking the true meaning of quantum mechanics. What is Real? is the gripping story of this battle of ideas and the courageous scientists who dared to stand up for truth.
Häftad, Engelska, 2002
259 kr
Skickas inom 10-15 vardagar
David Bohm was one of the foremost scientific thinkers and philosophers of our time. Although deeply influenced by Einstein, he was also, more unusually for a scientist, inspired by mysticism. Indeed, in the 1970s and 1980s he made contact with both J. Krishnamurti and the Dalai Lama whose teachings helped shape his work. In both science and philosophy, Bohm's main concern was with understanding the nature of reality in general and of consciousness in particular. In this classic work he develops a theory of quantum physics which treats the totality of existence as an unbroken whole. Writing clearly and without technical jargon, he makes complex ideas accessible to anyone interested in the nature of reality.
Häftad, Engelska, 2024
186 kr
Skickas inom 7-10 vardagar
Mathematician and popular science author Eugenia Cheng is on a mission to show you that mathematics can be flexible, creative, and visual. This joyful journey through the world of abstract mathematics into category theory will demystify mathematical thought processes and help you develop your own thinking, with no formal mathematical background needed. The book brings abstract mathematical ideas down to earth using examples of social justice, current events, and everyday life - from privilege to COVID-19 to driving routes. The journey begins with the ideas and workings of abstract mathematics, after which you will gently climb toward more technical material, learning everything needed to understand category theory, and then key concepts in category theory like natural transformations, duality, and even a glimpse of ongoing research in higher-dimensional category theory. For fans of How to Bake Pi, this will help you dig deeper into mathematical concepts and build your mathematical background.
Häftad, Engelska, 2000
975 kr
Skickas inom 7-10 vardagar
This book gives a modern, comprehensive introduction to the principles of quantum mechanics, to the main approximation methods and to the application of quantum theory to a wide variety of systems. The needs of students having an average mathematical ability are kept very much in mind, with the avoidance of complex mathematical arguments and any undue compression of material
Inbunden, Engelska, 2020
895 kr
Skickas inom 7-10 vardagar
Modern Quantum Mechanics is a classic graduate level textbook, covering the main concepts from quantum mechanics in a clear, organized and engaging manner. The original author, J. J. Sakurai, was a renowned particle theorist. This third edition, revised by Jim Napolitano, introduces topics that extend its value into the twenty-first century, such as modern mathematical techniques for advanced quantum mechanical calculations, while at the same time retaining fundamental topics such as neutron interferometer experiments, Feynman path integrals, correlation measurements, and Bell's inequalities. A solutions manual is available.
Häftad, Engelska, 2021
141 kr
Skickas
The ultimate non-technical guide to the fast-developing world of quantum computing Computer technology has improved exponentially over the last 50 years. But the headroom for bigger and better electronic solutions is running out. Our best hope is to engage the power of quantum physics. 'Quantum algorithms' had already been written long before hardware was built. These would enable, for example, a quantum computer to exponentially speed up an information search, or to crack the mathematical trick behind internet security. However, making a quantum computer is incredibly difficult. Despite hundreds of laboratories around the world working on them, we are only just seeing them come close to 'supremacy' where they can outperform a traditional computer. In this approachable introduction, Brian Clegg explains algorithms and their quantum counterparts, explores the physical building blocks and quantum weirdness necessary to make a quantum computer, and uncovers the capabilities of the current generation of machines.