Étudiant-chercheur étoile February 2015

Gabriel Éthier-Majcher

Gabriel Éthier-Majcher

PhD student in Engineering Physics
École Polytechnique de Montréal

Award-winning publication: Complete quantum control of exciton qubits bound to isoelectronic centres

Published in: Nature Communications 5:3980 (2014)


"The anticipated power of quantum computers stems from the way the machines encrypt information: in standard computers, a data bit has a value of 0 or 1, whereas in quantum computers, a qubit (quantum bit) may be in any superposition of both states. However, these quantum states are quite fragile, making it very difficult to create qubit interactions and carry out operations. Current research in the field therefore aims to determine the best platform to accomplish this. For the very first time, we are proposing isoelectronic centres made from a nitrogen molecule in a semiconductor as a platform to encrypt quantum information. Our findings demonstrate that it is possible to write and manipulate the state of the system's qubits, which strongly interact with light and are very homogenous. The combination of these two valuable characteristics fosters qubit coupling and is unique to our system, which, in fact, constitutes an interesting avenue for quantum computer development."

Set out in 1975, Moore's law, which stipulates that the number of transistors in an integrated circuit doubles approximately every two years, has proved accurate. The dramatic increase in the capacities of computers has led to the development of powerful machines with applications in all areas. However, there are limits to transistor miniaturization, and the enhanced performances of computers will inevitably peak in the years to come. Quantum computers hold unparalleled possibilities, and Gabriel Éthier-Majcher's research will help determine the most promising system to bring the technology to fruition.