Read e-book online An Introduction to Quantum Computing Algorithms PDF

By Arthur O. Pittenger (auth.)

ISBN-10: 0817641270

ISBN-13: 9780817641276

ISBN-10: 3764341270

ISBN-13: 9783764341275

In 1994 Peter Shor [65] released a factoring set of rules for a quantum laptop that unearths the best components of a composite integer N extra successfully than is feasible with the identified algorithms for a classical com­ puter. because the hassle of the factoring challenge is important for the se­ curity of a public key encryption method, curiosity (and investment) in quan­ tum computing and quantum computation all at once blossomed. Quan­ tum computing had arrived. The research of the position of quantum mechanics within the concept of computa­ tion turns out to have began within the early Eighties with the guides of Paul Benioff [6]' [7] who thought of a quantum mechanical version of pcs and the computation approach. A comparable query was once mentioned almost immediately thereafter via Richard Feynman [35] who started from a unique perspec­ tive by means of asking what sort of desktop might be used to simulate physics. His research led him to the assumption that with an appropriate classification of "quantum machines" you could imitate any quantum system.

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Extra info for An Introduction to Quantum Computing Algorithms

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For example, the abstract data structure for polynomials in the examples above is the set of coefficients: a user providing input to one of the programs above need not know whether a linked list or an array is being used. Modern programming systems have sophisticated mechanisms which make it possible to change representations easily, even in large, tightly integrated systems. AFUTHAJETIC 31 Exercises 1. Another way to represent polynomials is to write them in the form rc(xrr)(z - r2) . . (X - TN).

These data structures are used by many of the algorithms in this book; in later sections we’ll study some more advanced data structures. Polynomials Suppose that we wish to write a program that adds two polynomials: we would 23 CJUJ’TER 2 24 like it to perform calculations like (1+ 2x - 3x3) + (2 -x) = 3 + x - 3x3. In general, suppose we wish our program to be able to compute r(x) = p(x) + q(x), where p and q are polynomials with N coefficients. maxN] of real; N, i: integer; begin readln (N) ; for i:=O to N-l do read(p[i]); for i:=O to N-l do read(q[i]); for i:=O to N-J do r[i] :=p[i]+q[i]; for i:=O to N-l do write(r[i]); wri teln end.

Give a counterexample to the assertion that the user of an abstract data structure need not know what representation is being used. 3. Random Numbers Our next set of algorithms will bie methods for using a computer to generate random numbers. We will find many uses for random numbers later on; let’s begin by trying to get a better idea of exactly what they are. Often, in conversation, people use the term random when they really mean arbitrary. When one asks for an trrbitrary number, one is saying that one doesn’t really care what number one gets: almost any number will do.

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An Introduction to Quantum Computing Algorithms by Arthur O. Pittenger (auth.)


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