Quantum oracle
A quantum oracle is a problem-specific quantum subroutine that recognizes or marks computational-basis states satisfying a specified condition.
Quantum Programming in Depth
A marking oracle is a quantum oracle that identifies selected computational-basis states by applying a designated marking transformation to them.
- How it is used
- Supplies the problem-specific predicate that Grover’s search uses to distinguish solution inputs from non-solutions.
- How deep it goes
- Derives phase and marking transformations, then implements and tests marking-oracle-based phase kickback in Qiskit and Q#.
- Examples
- Uses marked strings 001 and 110, then N queens placements with bit and integer-index encodings.
- What you can do after
- Build it from scratch as a reversible marking oracle and apply it through phase kickback in Grover search.
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Building Quantum Software with Python
A quantum oracle is a computational subroutine that recognizes or marks states satisfying a specified condition.
- How it is used
- Marks desired outcomes for quantum search and probability-estimation tasks.
- How deep it goes
- Explains phase and bit tagging, conversion, and Python circuit construction with controlled operations.
- Examples
- Demonstrates three-qubit matches for outcomes 1, 3, and 5 and function-output searches for f(k)=k+1 and f(k)=k²−5.
- What you can do after
- Build it from scratch as phase or bit circuits that tag selected binary outcomes for Grover operators.
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Related concepts
- Grover iteratepart of · A Grover iterate is one application of the composite quantum operation combining an oracle with a reflection about the prepared initial state.
- inversion operatoruses · An inversion operator is a quantum transformation that reflects amplitudes about their average value, equivalently the inversion-by-the-mean operation used in Grover search.
- classical functionimplements · A mapping from classical inputs to classical outputs that specifies the function implemented by an oracle.
- bit oracleuses · A bit oracle is a quantum oracle that marks satisfying inputs by changing an output bit or target qubit.
- amplitude amplificationused by · Amplitude amplification is a quantum algorithmic technique that increases the probability of measuring states marked as desirable by an oracle.
- quantum circuitkind of · A quantum circuit is an ordered arrangement of quantum gates, measurements, and related operations that specifies a computation on qubits.
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