Notation

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Symbol Definition
Hilbert Space
The set of complex numbers
The set of real numbers
Chapter 2 - Qubits and Collections of Qubits
The Pauli X matrix (see Table 2.1)
The Pauli Y matrix (see Table 2.1)
The Pauli Z matrix (see Table 2.1)
The
The Kronecker delta (see Equation C.17)
Epsilon (see Equation C.8)
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Chapter 3 - Physics of Quantum Information
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Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle \hbar\,\!} H-bar (Planck's constant divided by Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle 2\pi\,\!} )
Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle U\,\!} The Unitary Matrix
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Chapter 4 - Entanglement