The T-Gate negates |0> state and applies an negative imaginary unit multiplication to |1> state.
The complex number Quantum Possilitity Space is different after the T-Gate however probability, equal to the square of QPS magnitude, is unchanged. As a result, the plot of state probabilities is visually similar to the previous tab 'S-Gate'.
T-Gate
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The probability of each state vector is shown in each three qubit circuit: mouse over bars for detail.