This repository contains the tasks of Changsoo Kim during his internship with Qibo.

Improve Qibo SABRE

Issues

Issue #3

Notebook

• For QFT(10), the average number of CZ gates is similar, but the minimum number of CZ gates is smaller when using Qiskit SABRE.
• For random CZ circuits, both the average and minimum number of CZ gates are smaller when using Qiskit SABRE.
• Qiskit shows more fluctuation.
• This indicates that Qiskit SABRE has the potential to generate routings with fewer CZ gates.

Issue #4

Notebook

• For QFT(5) + Cycle, Shortestpath has fewer CNOTs than SABRE. Shortestpath has the potential to generate routings with fewer CZ gates in 5-qubit circuits.

Improve KAK

Issue #20

• The matrix reassembled after the KAK decomposition is different from the original matrix when using Identity and CNOT matrices.

Design a Placer with New Cost Function

• Variables to consider: Coherence time, Qubit fidelity
• Example Cost Function: C = func(Fid_SWAP_ij, ti, tj)
• Fid_SWAP_ij = #SWAPS * fidelity
• Choose SWAP path with the highest fidelity