Controlled Phase Gate
2022/02/12
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https://pixabay.com/zh/photos/microscope-slide-research-close-up-275984/
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◎ 說明：
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Q1：何時適合學習 Controlled Phase Gate？
A1：Hadamard Gate 與 Controlled Phase Gate 是 Quantum Fourier Transform 的兩個基本元件。Hadamard Gate 需繼續深入 Hadamard Matrix 與 Hadamard Transform（本部落格尚未建立）。建議先完成 Fourier Transform，再來進行 Hadamard Gate。同理，建議先完成 Hadamard Gate 再來進行 Controlled Phase Gate。2022/02/13。
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Fig. 1. Controlled-Phase Gate [1]-[3].
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◎ 參考資料：
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「The symbols ⟨ and | tell us ⟨x| is a row vector and the symbols | and ⟩ tell us |ψ⟩ is a column vector. In quantum mechanics we call the column vectors kets and the row vectors bras.」[3]。
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References
[1] Quantum logic gate - Wikipedia
https://en.wikipedia.org/wiki/Quantum_logic_gate#Controlled_phase_shift
[2] CPhaseGate — Qiskit 0.34.2 documentation
https://qiskit.org/documentation/stubs/qiskit.circuit.library.CPhaseGate.html
[3] Representing Qubit States
https://qiskit.org/textbook/ch-states/representing-qubit-states.html
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