X gate
The X gate is a single-qubit quantum gate that exchanges the computational-basis states zero and one.
Quantum Programming in Depth
An X gate is a single-qubit bit-flip quantum gate that exchanges the computational-basis states zero and one.
- How it is used
- Uses the X gate for bit flips, measurement-result normalization, and distinguishing candidate unitary operations.
- How deep it goes
- Explains basis-state action and implements X within single- and two-qubit discrimination circuits, without developing its matrix representation.
- Examples
- Uses X-versus-Z, X-versus-H, and X-versus-minus-X discrimination experiments with measured circuit outcomes.
- What you can do after
- Apply it via Qiskit or Q# and test discrimination circuits through measurement outcomes and passing automated tests.
Building Quantum Software with Python
The X gate is a single-qubit quantum gate that swaps the amplitudes associated with the two computational-basis outcomes.
- How it is used
- Uses the X gate to transform a single-qubit state by exchanging its computational-basis amplitudes.
- How deep it goes
- Defines the amplitude swap, implements it with a list assignment, and verifies reversibility by applying the transformation twice.
- Examples
- Demonstrates the gate with two-item state lists, the default state [0, 1], and successive swaps returning [1, 0].
- What you can do after
- Builds a direct state-list simulation and verifies that applying the X gate twice restores the initial amplitudes.
Read how Building Quantum Software with Python explains x gate →
Related concepts
- quantum gatekind of · A quantum gate is an operation that transforms the state of one or more qubits, typically represented by a unitary transformation.
- inverseequivalent to · An inverse is a value or operation that reverses the effect of another value or operation under a specified composition rule.
- logical NOTimplements · Logical NOT is a unary Boolean operation that produces the complementary truth value of its operand.
- Qiskitused by · Qiskit is an open-source software development kit for constructing, simulating, compiling, and executing quantum circuits.
- reversible operationuses · A reversible operation is a computation that maps each input uniquely to an output so the input can be recovered.
- quantum stateuses · A quantum state is a mathematical representation of a quantum system that determines the probabilities of possible measurement outcomes.
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