✨ State Preparation Routines for DD Package #341
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## Description <!-- Please include a summary of the change and which issue is fixed. Please also include relevant motivation and context. List any dependencies that are required for this change. --> In #[341](#341 (comment)) the DD package provided methods for directly constructing DD for computational basis states or any product state that can be constructed from the single-qubit states `|0>, |1>, |+>, |->, |L>, |R>`. ## Updates There are now 2 routines which implement the - GHZ state - W state, also, there are unit tests which check that the preparation routines provide the desired states for a smaller number of qubits. Fixes #[341](#341 (comment)) <!--- Replace (issue) with the issue number that is fixed by this pull request. --> ## Notes In the beginning, I tried adding the routines to a different header file, however, I noticed that it was a lot easier to stick to the current structure and add the functions to the Package.hpp header inside the DD package. Additionally, I tried to use the existing functions in order to create & normalize the decision diagrams. ## Checklist: <!--- This checklist serves as a reminder of a couple of things that ensure your pull request will be merged swiftly. --> - [x] The pull request only contains commits that are related to it. - [x] I have added appropriate tests and documentation. - [x] I have made sure that all CI jobs on GitHub pass. - [x] The pull request introduces no new warnings and follows the project's style guidelines. --------- Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com> Co-authored-by: Lukas Burgholzer <[email protected]>
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Currently, the DD package provides methods for directly constructing the decision diagrams for
|0>, |1>, |+>, |->, |L>, |R>It would be convenient to have some further state preparations available that can be used, e.g., in DDSIM.
Examples:
It should be possible to directly construct the DDs for these states without starting from the all-zero state and applying some operations.
A suggestion would be to name these functions
make<SOME-IDENTIFIER>State.In the interest of providing a little more structure in the DD package, these functions should probably be designed in a way that they can be put into a separate header file and, ideally, not rely on any template stuff, so that the implementation can be moved to a source file.
If this is accomplished, the existing functions for state preparation should be moved as well.
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