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commit 2909c29ca2d5aa096363124c5ff0e1cbdfdf955e
Author: Krishna Dave <[email protected]>
AuthorDate: Fri Feb 7 00:18:38 2025 +0530
Update basic_gates.md (#492)
Updated the Basic Gates Section.
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# Quantum Gate Explanations
## NOT Gate (X-Gate)
-The NOT gate, represented by the X-gate, is a fundamental quantum gate used to
flip the state of a qubit. It is often referred to as a bit-flip gate. When
applied to a qubit in the |0⟩ state, it changes it to the |1⟩ state, and vice
versa. Mathematically, if |ψ⟩ represents the qubit's state, applying the X-gate
results in X|ψ⟩ = |¬ψ⟩.
+The NOT gate, also called the **Pauli X Gate**, is a fundamental quantum gate
used to flip the state of a qubit. It is often referred to as a bit-flip gate.
When applied to a qubit in the |0⟩ state, it changes it to the |1⟩ state, and
vice versa. Mathematically, if |ψ⟩ represents the qubit's state, applying the
X-gate results in:
+
+\[ X|ψ⟩ = |¬ψ⟩ \]
## Hadamard Gate (H-Gate)
-The Hadamard gate, denoted as the H-gate, is used to create superposition
states. When applied to a qubit in the |0⟩ state, it transforms it into an
equal superposition of |0⟩ and |1⟩ states. Mathematically, H|0⟩ = (|0⟩ + |1⟩) /
√2. It's a crucial gate in quantum algorithms like Grover's and quantum
teleportation.
+The Hadamard gate, denoted as the H-gate, is used to create superposition
states. When applied to a qubit in the |0⟩ state, it transforms it into an
equal superposition of |0⟩ and |1⟩ states. Mathematically:
+
+
+H|0⟩ = (|0⟩ + |1⟩) / √2
+
+
+
+This gate is crucial in quantum algorithms like Grover's and quantum
teleportation.
## CNOT Gate (Controlled-X Gate)
The CNOT gate, or controlled-X gate, is an entangling gate that acts on two
qubits: a control qubit and a target qubit. If the control qubit is in the |1⟩
state, it applies the X-gate to the target qubit; otherwise, it does nothing.
It creates entanglement between the two qubits and is essential in building
quantum circuits for various applications.
@@ -15,13 +24,32 @@ The Toffoli gate is a three-qubit gate that acts as a
controlled-controlled-X ga
## SWAP Gate
The SWAP gate exchanges the states of two qubits. When applied, it swaps the
state of the first qubit with the state of the second qubit. This gate is
fundamental in quantum algorithms and quantum error correction codes.
-## Pauli X Gate (X-Gate)
-The Pauli X gate is another name for the NOT gate, as mentioned earlier. It
flips the state of a qubit, changing |0⟩ to |1⟩ and vice versa. It's named
after Wolfgang Pauli, a pioneer in quantum physics.
-
## Pauli Y Gate (Y-Gate)
-The Pauli Y gate is a quantum gate that introduces complex phase shifts along
with a bit-flip operation. It can be thought of as a combination of bit-flip
and phase-flip gates. Mathematically, it is represented as Y|0⟩ = i|1⟩ and Y|1⟩
= -i|0⟩. It's essential in quantum error correction and quantum algorithms.
+The Pauli Y gate introduces complex phase shifts along with a bit-flip
operation. It can be thought of as a combination of bit-flip and phase-flip
gates. Mathematically:
+
+\[ Y|0⟩ = i|1⟩ \]
+\[ Y|1⟩ = -i|0⟩ \]
+
+It's essential in quantum error correction and quantum algorithms.
## Pauli Z Gate (Z-Gate)
-The Pauli Z gate is a gate that introduces a phase flip without changing the
qubit's state. It leaves |0⟩ unchanged and transforms |1⟩ to -|1⟩.
Mathematically, Z|0⟩ = |0⟩ and Z|1⟩ = -|1⟩. It's used for measuring the phase
of a qubit.
+The Pauli Z gate introduces a phase flip without changing the qubit's state.
It leaves |0⟩ unchanged and transforms |1⟩ to -|1⟩. Mathematically:
+
+\[ Z|0⟩ = |0⟩ \]
+\[ Z|1⟩ = -|1⟩ \]
+
+It's used for measuring the phase of a qubit.
+
+## T-Gate (π/8 Gate) (New Addition)
+The T-Gate applies a **π/4 phase shift** to the qubit. It is essential for
quantum computing because it, along with the Hadamard and CNOT gates, allows
for **universal quantum computation**. Mathematically:
+
+\[ T|0⟩ = |0⟩ \]
+\[ T|1⟩ = e^{i\pi/4} |1⟩ \]
+
+# **Updates**
+- **Acknowledged support for Cirq & Braket** (New Addition)
+- **Removed Pauli X Gate** (Merged into NOT Gate)
+- **Added T-Gate** (New Addition)
+- **Fixed typos**
These quantum gates are fundamental building blocks in quantum computing,
enabling the manipulation and transformation of qubit states to perform various
quantum algorithms and computations.
