51 lines
2.6 KiB
Plaintext
51 lines
2.6 KiB
Plaintext
---
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title: Map problem to quantum circuits and operators
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description: Take a classical problem and map it to run on a quantum computer.
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---
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# Map problem to quantum circuits and operators
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The "map problem to quantum circuits and operators" step of a Qiskit pattern describes how a user starts with a classical
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problem and figures out how to map it to a quantum computer.
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For example, in applications such as chemistry and quantum simulation, this step generally involves
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constructing a quantum circuit representing the Hamiltonian you are attempting to solve.
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During this step, for certain problems, it might also be desirable to specify the mapping of
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the problem onto qubits in the heavy-hex (or gross) lattice of IBM® hardware from the
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outset if the structure of the problem lends itself to optimization earlier.
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It is also worth considering at this point what the outcome of the particular algorithm will be
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in preparation for the later execute step - for example, if the desired outcome involves
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inferring correlation functions using Hadamard tests, you might prepare to use Sampler, whereas
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specifying observables would use Estimator and could provide many error mitigation options.
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The output of this step in a Qiskit pattern is normally a collection of circuits or quantum operators.
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## Guides for mapping problems to quantum circuits and operators
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### Build circuits with the Qiskit SDK
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* [Circuit library](./circuit-library)
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* [Construct circuits](./construct-circuits)
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* [Measure qubits](./measure-qubits)
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* [Visualize circuits](./visualize-circuits)
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* [Fractional gates](./fractional-gates)
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* [Classical feedforward and control flow](./classical-feedforward-and-control-flow)
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* [Synthesize unitary operators](./synthesize-unitary-operators)
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* [Bit-ordering in the Qiskit SDK](./bit-ordering)
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* [Save circuits to disk](./save-circuits)
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### Build operators with the Qiskit SDK
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* [Operators module overview](./operators-overview)
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* [Specifying observables in the Pauli basis](./specify-observables-pauli)
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* [The Operator class](./operator-class)
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### Other circuit building tools
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* [Pulse schedules](./pulse)
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* OpenQASM
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* [Intro to OpenQASM](./introduction-to-qasm)
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* [OpenQASM 2 and the Qiskit SDK](./interoperate-qiskit-qasm2)
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* [OpenQASM 3 and the Qiskit SDK](./interoperate-qiskit-qasm3)
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* [OpenQASM 3 feature table](./qasm-feature-table)
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* [OpenQASM 3.x live specification](https://openqasm.com/) |