An introduction to the basics of quantum computation is given. We present a generic physical
model of quantum computer hardware and compare ideal and physically realizable quantum
computers. The model is then used to simulate quantum computers hardware on a Quantum Computer
Emulator (QCE). We address the issue of reliable quantum computation on physically realizalbe
hardware using the QCE and Grover's database search algorithm as an example.
We show that in the absence of dissipation non-ideal, physically realizable quantum computers
operate in a regime of extreme sensitivity. This high sensitivity reflects itself in problems of
programming quantum computers such that they perform correct calculations. Ways to overcome
these difficulties will be discussed.
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