Quantum computing Definition and 253 Threads

Hey everyone, I'm sorry if this is not the right place to ask this, but here it goes: I have to do a presentation on a topic on quantum computing. Does anyone know any cool doable topics? We have been working through Ballentine's quantum mechanics book, to give you an idea of the level. Thanks!

What is quantum computing research mostly focused on? I mean, is it mostly about a physical point of view ( Like building better quantum transistor, or better quantum diodes, or, for example, using entalgment effect, to achieve better purposes), or is it mostly focused with quantum architectures...

I am not from physics but computer science. I am interested in the prospect of quantum computing in the future and would like eventually to learn a little bit about issues of hardware realizations of quantum computing from experts of this forum.

Hello all, On Cosmology webstie I found the article about Time Travel,Uncertainty Principle and Many Worlds. Here is the quote: "DeWitt’s many-worlds interpretation of Everett’s work, posits that there may be a split in the combined observer–object system, the observation causing the splitting...

I am working on a project for our local science fair and decided on researching quantum computers. (This is what my focus will be in college.) Though, I expect to work on this far past the time allotted for that. I would like to build a superconductor based qubit using Josephson Junctions. The...

Hello, I am a Physics undergraduate, currently beginning my third (out of four) year of studies. I have already taken courses about Real and Complex Analysis, Linear Algebra, ODEs and PDEs (for Maths), Classical Mechanics (Lagrangian and Hamiltonian formalism), Electromagnetism, Special...

My question is how does the uncertainty principle relate to quantum computers? Does it hinder the theoretical production of a quantum computer?

Hello all, I have come here to gather what the communities view is on the possibility of quantum computing in relation to the actual logic behind synchronous programming and the laws that (seem to) govern the quantum realm. Coming from a background in computer science, I have studied the basic...

I am a rising senior at a small liberal arts college, with an incredibly small (and therefore unrecognized) physics program. I am seeking advice regarding which Ph.D programs are within my reach. I plan on applying to AMO (Atomic, Molecular, and Optics) Ph.D programs with the intention of...

Hello guys, I will be starting my M.S Program in Solid State Electronics and was also curious about looking into quantum computing/superconductors. So can you guys suggest introductory levels books on quantum computing and and superconductors? I have an okay background in Physics (just...

I am newly learning quantum computing and am confused about some concepts. Suppose your qbit is the electron of a hydrogen atom and its in the state α|0> + β|1> . As far as I can understand, this means that if you measure the qbit in |0>, |1> basis, you will get a ground state electron with the...

Can anyone please explain the theory of Quantum Computing in just 10 sentences?

Hi. I am an undergraduate physics student and I really like the field of quantum computing. Can someone please tell me how good are the opportunities to work and research in this field? As I understand, there are not many places that do research in quantum computers as compared to something like...

Firstly, I apologise for any lack of understanding, incorrect assumptions or misinterpretations of the very little I know about physics, quantum mechanics & quantum computing. I am not an academic, scientist or mathematician, but a software engineer with an interest in quantum computing and...

So, from what I understand, modern computers use superscalar CPUs which allows the computer to run two instructions on two separate lines of data in parallel. Which in lame man's terms is just: the CPU can run two instructions at the same time. Now, from what I understand, this is also a...

Hi, folks! I am Maisalatison. I currently teach physics at a Nigerian university. My earlier experience includes many years in government service on educational planning and curriculum development for technical & vocational education. I look forward to sharing ideas on especially use of...

please share the best clearest introductory books or articles (like from sci-am or discover magazine with colorful illustrations)) on quantum computing (or quantum computers) like how they are implemented in the hardware. I see thousands of examples of quantum entanglements in books, magazine...

Hello, Is it possible to build a qubit from an atom with a nuclear spin of zero (ie. 16O, 12C, 32S)? Would it depend on electron spin instead? Thanks!

My question seems like it should be posted in Computer Engineering section, but below is how I found this word. I was reading the textbook: Quantum Computation And Quantum Information - by Michael A. Nielsen and Issac L. Chuang. and I came across with the this word; "1.3.1 Single qubit gates...

I am still in high school but my curiosity is not stopping me from posting in this forum. How is data stored in SSD? How does it differ from the old HDD? I heard that atoms are used to store data. How? Binary consists of 0 and 1. How does someone use an atom to represent 0 and 1? Does positive...

Hi I am an undergrad student in an Electrical engineering program and going for my masters and undergrad degree at the same time (special program i am in). I an very interested on the hardware side of quantum computing as to have a future career in this field (eventually will go for a PhD). I...

I'm currently in my final year of BSc(Hons) in mathematics and computer science & A.I (applied math stream). Indeed, I'm starting to think about what masters I want to pursue and the kind of subject I would like to specialize in. I am really interested in quantum computation and the prospects of...

I was flipping through Kitaev's quantum computing book today and noticed something really strange. I thought it might be fun to post it here and figure out what's going on. See...

Hi all! this is my first hour on Physics forums! so my question is, which of the 3 named fields (cs, ee, phys) are more active in quantum computation/information? I am a double majored ee/phys and I've passed some cs courses. as far as I see, any quantum lab will contain researches from all...

Hello! I am new here and I will try my best to clarify my questions and not violate the forum rules. Just for the record, I am not particularly good at understanding equation-saturated explanations because I am not an expert. However, I did a lot of searching and I still don't understand...

Lately I've been hearing about latest advancements in quantum computers, such as the chinese group breaks distance record for teleporting qubits (As seen on phys.org, Unfortunately i cannot post that link because i am new). I was just wondering if anybody could clear up what a quantum computer...

I want to know if a quantum computing model exists where you can prepare two different states on n qubits and interfere (i.e. add) them together. For example, for two qubits, consider the states (|00> + |01>)/√2 and -(|00> + |10>)/√2 (both pretty easy to prepare in most quantum computing...

Any boolean formula can be represented efficiently as a reversible circuit (i.e. with at most a polynomial increase in the number of gates), with n input bits and n output bits. If it is an n-input, 1-output formula, the corresponding reversible circuit will have 1 'main' output bit and a series...

What are you guy's thoughts on constructing a quantum computer from attosecond double-slit phenomena?

Does anyone know of any computer programs that can be used for quantum mechanics applications?

I'm having a hard time assessing the reality of job prospects in quantum computing research. The research seems mostly limited to schools I wouldn't dream of getting into and the companies pursing the technology seem limited as well. I'm currently undeclared and taking the basic math...

Hi there I am working through a quantum gate section of my course and I am a bit puzzled on how to calculate a matrix for consecutive quantum gates. I understand how to generate a matrix for |q0⟩--------[H]------- |q1⟩------------------ Which is simply the tensor product of the hadamard...

Although I've read many times that quantum computers are reversible, I am unable to find a understandable explanation as to why (this may be because I study Computer Science). From what I've read, I assume that the answer is linked to the Second Law of Thermodynamics, but I don't know how...

Why is a quantum computer theoretically faster than a regular computer? Is it because of parallelization?

What is auxiliary state?

Why quantum computers are faster?

Recently I have been looking into Fuzzy Theory which is a relatively new subset of logic and is closely related to probability theory. Fuzzy Theory right now is practically a "taboo science" with not many scholars too interested in it. However, I see this as a grand opportunity to jump into a...

What of importance of superposition in quantum computing? What I understood is we have two states |0> and |1> which represent logical 0 and 1 . So the mixed state can be given by the combination of logical operators like OR, AND and NOR Etc. For example 1/3 |0>+2/3 |1> The particle...

Hey, I'm learning about quantum computing for a project and I'm a bit stumped about a concept: They say in quantum computing you can have the superpostion of all possible states, then perform an operation on that wavefunction, and thus have all possible states processed in one operation...

Hello Everyone I was hoping someone can answer how quantum computers work. I understand how digital logic works such as in AND gates and OR gates, but I am not sure how quantum physics wave functions can make this any faster. I was thinking maybe because whenever a piece of matter has the...

First of all, I haven't the slightest idea how a quantum computer actually works but I understand that it is theoretically possible to make them and they could, in theory, be used to compute things that a classical computer would take too long to compute. (i.e. large combinatorial problems like...

Hey all, I'm an undergraduate physics major, thinking about what I want to study in graduate school. Lately, I've been extremely interested in the field of quantum computing. However, I'm not sure what the best background is to do research in this field. Is is physics? Computer science...

Hams and Raedt gave a quantum computational algorithm to calculate the density of states of a spin system. Starting with an initial random state, they obtain the time evolution of the state. Later they take the inner product of the evolved state with the initial state. How does the inner...

Has anyone ever had the opportunity to have a theoretical quantum computer running on your PC (being simulated) and write software for it? If you have, could you tell me what you used for the quantum computer and maybe some "Hello World" code (a book explaining the 'language' and some of the...

When do you think Quantum Computers will be out? Most scientists think 20-30 years but we have them in the lab already, they're just 1.5mill and only about 6 qubits.

I have heard the phrase quantum computing my question is what is it? Thanks.

This question has been bugging me. I have a math degree, and my computer knowledge is limited to VERY BASIC programming and being able to build my own PC, so I thought this would be a good place to ask. Note: This question has no "clean cut" forum to fit into. I read ALL the forum...

Hello there forum! I would like to present a paper on quantum computers. Idk where to start from. I have high school level knowledge on quantum mechanics, semester on quantum physics and also the knowledge the feynman lecture vol 3 would give its readers.

Hello everyone, I'm from Toronto in CANADA and I am going into grade 12 this September. I figured that it's time to figure out what I want to do with my life and how to achieve it. So I've been debating between research/building a quantum computer, working on teleportation (far-fetched I...

D-Wave has claimed that they offer a commercial quantum computer, using a 128-qubit chipset. What exactly is going on here? I'm sure that this is not the traditional quantum computer, since the record of http://www.physorg.com/news/2011-04-quantum-bits-physicists-limits.html" was reached only a...