[Qiskit-Aer] Improve qiskit-aer performance by rewriting a circuit

[hhorii]

Abstract

Improve simulation performance in qiskit by adding specialized transpilation.

Description

There are two approaches to add new transpilation technique for simulation.

• Add a pass in terra
• Add a optimizer in aer

Some optimization candidates are:

• Use unitary-matrix-simulator to generate a matrix for aggregated gates in fusion.hpp
• Generate a large diagonal unitary matrix in terra or aer
• Enable fusion_enable optimization automatically depending on a number of qubits or circuit characteristics
• Reuse the same qubitvector to get samples for a circuit in noisy simulation

Benchmarks:

• QFT
• Quantum Volume

Setup of build environment:

• https://github.com/Qiskit/qiskit-aer/blob/master/CONTRIBUTING.md#install-from-source

Members

• @githubhandle
• @githubhandle - Slack: @slackhandle email: example@example.com
• Qiskit Coach: @hhorii

Deliverable

GitHub repo

[hillmich]

Stefan Hillmich, CS

[kurarrr]

Ryota Yonekura, CS

[hhorii]

Merged to #6