QFTSynthesisFull

class qiskit.transpiler.passes.synthesis.high_level_synthesis.QFTSynthesisFull

Bases: HighLevelSynthesisPlugin

Synthesis plugin for QFT gates using all-to-all connectivity.

This plugin name is :qft.full which can be used as the key on an HLSConfig object to use this method with HighLevelSynthesis.

The plugin supports the following additional options:

• reverse_qubits (bool): Whether to synthesize the “QFT” operation (if False,

  which is the default) or the “QFT-with-reversal” operation (if True). Some implementation of the QFTGate include a layer of swap gates at the end of the synthesized circuit, which can in principle be dropped if the QFTGate itself is the last gate in the circuit.

• approximation_degree (int): The degree of approximation (0 for no approximation).

  It is possible to implement the QFT approximately by ignoring controlled-phase rotations with the angle beneath a threshold. This is discussed in more detail in [1] or [2].

• insert_barriers (bool): If True, barriers are inserted as visualization improvement.

• inverse (bool): If True, the inverse Fourier transform is constructed.

• name (str): The name of the circuit.

References

1. Adriano Barenco, Artur Ekert, Kalle-Antti Suominen, and Päivi Törmä, Approximate Quantum Fourier Transform and Decoherence, Physical Review A (1996). arXiv:quant-ph/9601018 [quant-ph]
2. Donny Cheung, Improved Bounds for the Approximate QFT (2004), arXiv:quant-ph/0403071 [quant-ph]

Methods

run