By Phillip Kaye, Raymond Laflamme, Michele Mosca

ISBN-10: 0198570007

ISBN-13: 9780198570004

This concise, available textual content offers an intensive creation to quantum computing - an exhilarating emergent box on the interface of the pc, engineering, mathematical and actual sciences. aimed toward complex undergraduate and starting graduate scholars in those disciplines, the textual content is technically unique and is obviously illustrated all through with diagrams and routines. a few previous wisdom of linear algebra is believed, together with vector areas and internal items. despite the fact that, earlier familiarity with issues corresponding to tensor items and spectral decomposition isn't really required, because the priceless fabric is reviewed within the textual content.

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6) The Schmidt coefficients are p0 = 0, p1 = 1. 3 As a slightly less trivial example, consider the following state on the same 4-dimensional space HA ⊗ HB as in the previous example: |ψ = 12 |00 + 12 |01 + 12 |10 + 12 |11 . 7) In this example, the computational basis is not a Schmidt basis for either HA or HB . Notice that we can rewrite the vector as |ψ = 1 √ |0 2 + 1 √ |1 2 1 √ |0 2 + √1 |1 2 . 10) and the Schmidt coefficients are p0 = 1, p1 = 0. The Schmidt bases for the two parts of the composite space will not always be the same.

3). 11) where is a physical constant known as Planck’s constant and H(t) is a Hermitean operator known as the Hamiltonian of the system. The Hamiltonian is an operator which represents the total energy function for the system. It may in general be a function of time, but for convenience, let us consider Hamiltonians that are constant. 12) |ψ(t2 ) = e−i H(t2 −t1 ) |ψ(t1 ) . 12) is a solution of the time-independent Schr¨ odinger equation. For Hermitean operators H, the operator e−iH(t2 −t1 ) is a unitary operator.

When we attempt to use computers to simulate systems whose behaviour is explicitly quantum mechanical, many physicists (including Richard Feynman) observed that we do not seem to be able to do so efficiently. Any attempt to simulate the evolution of a generic quantum–physical system on a probabilistic Turing machine seems to require an exponential overhead in resources. Feynman suggested that a computer could be designed to exploit the laws of quantum physics, that is, a computer whose evolution is explicitly quantum mechanical.

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An Introduction to Quantum Computing by Phillip Kaye, Raymond Laflamme, Michele Mosca


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