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Physics Today

The Father of Quantum Computing

Published Feb 16, 2007• 6 citations
Publisher

Abstract

Wired: On Tuesday, Canadian company D-Wave Systems demonstrated a 16-qubit, specific-purpose quantum computer to a room packed with observers and thick with doubt and awe. Reporters watched as the machine solved a Sudoku puzzle and a seating arrangements problem, and, most impressively, searched for molecules similar to the drug Prilosec from a database of molecules.

DOI
10.1063/pt.5.020865

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Wired: On Tuesday, Canadian company D-Wave Systems demonstrated a 16-qubit, specific-purpose quantum computer to a room packed with observers and thick with doubt and awe. Reporters watched as the machine solved a Sudoku puzzle and a seating arrangements problem, and, most impressively, searched for molecules similar to the drug Prilosec from a database of molecules.
The 300 or so scientists, journalists and entrepreneurs who gathered at the Computer History Museum in California's Silicon Valley on 13 February had, on the face of it, come to see a man solve a Sudoku puzzle on a laptop. Why did they bother turning up, you might ask. The reason was that the puzzle was apparently not being solved by the laptop, but by another computer, connected over the Internet, that was sitting in a lab in Vancouver. This second computer was no ordinary digital device but, according to the company D-Wave carrying out the demonstration, the "world's first commercially viable quantum computer".
After a year of outside investigation, questions remain about a controversial quantum computer. When in 1935 physicist Erwin Schrodinger proposed his thought experiment involving a cat that could be both dead and alive, he could have been talking about D-Wave Systems. The Canadian start-up is the maker of what it claims is the world's first commercial-scale quantum computer. But exactly what its computer does and how well it does it remain as frustratingly unknown as the health of Schrodinger's poor puss. D-Wave has succeeded in attracting bigname customers such as Google and Lockheed Martin Corp. But many scientists still doubt the long-term viability of D-Wave's technology, which has defied scientific understanding of quantum computing from the start.
In recent years, researchers have oriented their studies towards new technologies based on quantum physics that should resolve complex problems currently considered to be intractable. This new research area is called Quantum Computing. What makes Quantum Computing so attractive is the particular way with which quantum technology operates and the great potential it can offer to solve real-world problems. This work focuses on solving assignment-like combinatorial optimization problems by exploiting this novel computational approach. A case-study, denoted as the Seating Arrangement Optimization problem, is considered. It is modeled through the Quadratic Unconstrained Binary Optimization paradigm and solved through two tools made available by the D-Wave Systems company, QBSolv, and a quantum-classical hybrid system. The obtained experimental results are compared in terms of solution quality and computational efficiency.