Target qubit

As explained in Quantum Programming in Depth

A target qubit is a qubit on which a controlled gate conditionally performs its operation.

How Quantum Programming in Depth covers it

How deep it goes

Defines conditional action, basis-state behavior, and superposition linearity, while deferring controlled-gate matrix forms.

Examples

Uses CNOT transformations of |10⟩, |11⟩, |00⟩, and |01⟩ to demonstrate target behavior.

What it assumes

Uses basis states, superposition, linearity, and Dirac notation as the working language for analysis.

What you can do after

Evaluate controlled-gate effects on basis states and superpositions using Dirac notation.

How it connects

Connects target qubits with controlled gates, control qubits, CNOT gates, basis states, superposition, and Dirac notation.

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Also explained in

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  Building Quantum Software with PythonA target qubit is the qubit position whose differing bit values determine which quantum-state amplitudes are paired for recombination.

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Related concepts

• quantum operationused by · A quantum operation is a physical or computational transformation acting on a quantum state, including unitary evolution and measurement.
• controlled quantum operationused by · A controlled quantum operation is a quantum operation applied to target systems only when specified control qubits have required states.
• phase gateconfigured by · The Z gate is a single-qubit Pauli quantum operation that leaves |0⟩ unchanged and multiplies |1⟩ by −1.
• quantum gateconfigured by · A quantum gate is an operation that transforms the state of one or more qubits, typically represented by a unitary transformation.
• butterfly patternconfigures · A butterfly pattern is a computational pattern that recombines pairs of values with a formula to produce updated values.
• control qubitconfigured by · A control qubit is a qubit whose state conditionally determines whether a controlled quantum operation acts on target qubits.

This explainer was generated by Manning's knowledge graph from the text of Quantum Programming in Depth. The section links point to the parts of the book it draws on.