You spoke about Quantum circuits in this essay. In order to approximate an arbitrary Quantum gate using the universal set of gates, is there any general algorithm to do that? Because I wondered how you realized the Toffoli gate using the universal set of gates in your book.

Because I’ve found a method to achieve any permuatation of a 8×8 unit matrix just by using CNOT and TOFFOLI gates. I don’t know anything about the efficiency or if it already exists or not. Just found it with little observation while working out the exercise of your book.

Also one more question: As long as the qubits are not in the non-decomposable states such as Bell states, can’t they be represented as n 2×2 matrices? Whenever say the amplitude of state |u> is needed it takes utmost n multiplications in this case to retain it. [Of course, it takes 2^n steps to retain the complete state of the system]. It looks a little efficient because in order to manipulate a single qubit, we no longer need to update 2^n numbers, but simply 2 numbers in case of single qubit gates, or 4 numbers in case of 2-qubit gates which form a universal set.

]]>What is your comment on the paper at: http://vixra.org/pdf/1402.0142v1.pdf ?

]]>Suppose we want to sort even some 10000 numbers only, still if the sizes of the numbers have very wide range, i.e. if they belong in the range (0, 2^32) then Bubble sort or some other equivalent sort will be much better way to get the job done in practice.

DPM

]]>That article doesn’t look interesting to me.

]]>Can there be algorithms where Classical (conventional) Computer can do better than Quantum Computer?

I am confused by an article claiming such speedup. The link to the article is

http://vixra.org/pdf/1306.0193v2.pdf

Please guide in this respect.

DPM

]]>I’ve read and read your explanation of QC, and still i can’t imagine what QC is.

I have no history in engineering/math/science, but I am an avid fan and bystander of science and technology.

So I have some really really stupid questions for you.

1. What would a QC look like? what kind of user interface would it have?

2. What would we use a QC for in day to day life? Or is it rather an instrument for scientific research?

I have warned you about the ignorance of my questions đź™‚

But I would be very grateful for any thoughts or answers.

Thank you in Advance,

Kind regards,

MvH

I finished my post graduate in Computer Science.

I want to do Phd in Quantum Computing.

Can i do?

Please give your advise.

What type of knowledge i need for QC.

The most intuitive QFT and quantum-computing model is Macroscopic Phonons. Suddenly one sees quantum computing processes all around us.

For example, consider a child’s kite as a basic quantum-computer suited to solve its flight control problem. Consistent with QFT and quantum computing theory, one finds phononic qubit “cells” in the kite stick and membrane field: one pair encodes yaw, another pitch, and so on. The wind itself is a quantum phonon qubit (or packet of qubits). The kitestring is a quibit cell. As these qubits interact as a computer, the kite flies. Its a “quantum robot” đź™‚

On the other hand, a kite cab be designed with no embodied quantum-computed “inherent stabilities”, but instead depend on a complex digital sensor/microcontroller/actuator “classical” control system, which adds prohibitive cost and mass.

The utter elegance of the embodied phonon-based quantum computation is quite apparent.

Please copy me by email if you have a specific reply to this conjecture.

]]>Personally, I think this is likely to be true, but perhaps not quite as likely as many quantum computer scientists. Indeed, in some sense I even hope it’s true: it’d be a remarkable breakthrough in our understanding of quantum mechanics!

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