6-Nathan Jones Quantum Computing

6-Nathan Jones Quantum Computing - Quantum Computing Nathan...

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Quantum Computing Nathan C. Jones ECE3080 April 7, 2008
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Qubit: The Quantum Unit of Information Conventional computers use bit (= 0 or 1) Quantum computers use a quantum bit, or qubit . Quantum mechanics allows the qubit to be 0, 1, or somewhere in between . How is this possible? Downloaded from http://www.sciencecartoonsplus.com/miracle.gif
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Qubit: A Two-Level System Given Schrodinger’s Equation, Ĥ ψ = E ψ The solution may have the form ψ = A φ 0 + B φ 1 This is a two-level system , since there are two possible states. In quantum mechanics, the system can exist in both states at once with varying probability. Examples include energy levels of trapped ions, or quantum dots - basically 3D quantum wells.
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Now decide that for our logical qubit, φ 0 Y “0” φ 1 Y “1” In this manner, the different states of our quantum system represent logical values, just like a bit. “1”
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6-Nathan Jones Quantum Computing - Quantum Computing Nathan...

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