22.10.2020

Space-efficient binary optimization for variational computing – online seminar


Academic Centre for Materials and Nanotechnology AGH UST invites for an online seminar that will be held on 22nd of October, 2020, at 2.00 pm.

A lecture titled “Space-efficient binary optimization for variational computing” will be given by MA Adam Glos Institute of Theoretical and Applied Informatics, Polish Academy of Sciences in Gliwice.

Link for participants

Abstract

In the era of Noisy Intermediate-Scale Quantum (NISQ) computers it is crucial to design quantum algorithms which do not require many qubits or deep circuits. Unfortunately, the most well-known quantum algorithms are too demanding to be run on currently available quantum devices. Moreover, even the state-of-the-art algorithms developed for the NISQ era often suffer from high space complexity requirements for particular problem classes. In this paper, we show that it is possible to greatly reduce the number of qubits needed for the Traveling Salesman Problem (TSP), a paradigmatic optimization task, at the cost of having deeper variational circuits. While the focus is on this particular problem, we claim that the approach can be generalized for other problems where the standard bit-encoding is highly inefficient. Finally, we also propose encoding schemes which smoothly interpolate between the qubit-efficient and the circuit depth-efficient models. All the proposed encodings remain efficient to implement within the Quantum Approximate Optimization Algorithm framework.