Computing phase factors

nlft-qsp provides various methods to synthesize QSP protocols in several variants.

It is possible to provide a Polynomial or ChebyshevTExpansion to directly implement, or specify a Python function implementing the desired function \(f(z) : \mathbb{T} \rightarrow \mathbb{C}\) or \(f(x) : [-1, 1] \rightarrow \mathbb{C}\), depending on the variant.

• Generalized quantum signal processing (GQSP)

• XQSP and YQSP

• Chebyshev QSP

• QSVT

Note

The naming conventions for the variants of QSP used by this package follow this paper.