GOLD MEDAL CNRS
Settling a 70-year-old dispute between Bohr and Einstein and breaking through a supposedly "insurmountable" barrier to absolute zero are some of the numerous achievements of Alain Aspect, recipient of the 2005 CNRS Gold Medal.Alain Aspect, now 58, has made many breakthroughs in one of the most complex of scientific disciplines: quantum mechanics. УThe concepts of quantum physics are outrageously counterintuitive,Ф warns Alain Aspect, from his office at the Orsay-based Institut d'Optique. Senior researcher at CNRS and professor at the renowned Ecole Polytechnique, he is also a member of both the French Academy of Sciences and the Academy of Technologies.
In 1985, together with Jean Dalibard and Christophe Salomon, Alain Aspect and Claude Cohen-Tannoudji launched a team to work on the laser cooling of atoms at Laboratoire Kastler Brossel (ENS). They pushed down atom cooling by breaking so-called Уsingle photon limit,Ф getting down to one microkelvinЧa mere millionth of a degree above absolute zero.
Ready for new challenges, Aspect set up an atom optics group at the Institut d'Optique at Orsay in 1992. Inspired by the 1995 revolutionary creation of the first gaseous Bose-Einstein condensate in the US, his team launched a program on atom lasers, a device promising exciting applications. In 2001, the team became the first to obtain a condensate of atoms of metastable helium, and opened a new chapter in Уquantum atom opticsФ.
This multifaceted scientist is enthralled with his field: УThe laser, the transistor and integrated circuitsЧand thus the computerЧall have their origins in quantum physics, which also underlies the new field of quantum information.Ф So what's next for Aspect? УIt's absurd to try to plan your life when you're a researcher,Ф he observes, Уthere is so much chance involved.Ф Indeed, where will the next quest lead this scientist, who is as hard to pin down as the particles of light he works with?
1. J.S. Bell, УOn the Einstein Podolsky Rosen ParadoxФ (1964). Paper reproduced in Speakable and unspeakable in quantum mechanics, Cambridge: Cambridge University Press, 2nd edition, 2004.
References: the main work of A. Aspect on superluminal propagation of the photons: Aspect A., Dalibard J., Roger G., Experimental Test of Bell's Inequalities Using Time-Varying Analysers. - Phys. Rev. Lett. 49, 25, (1982).
Alain Aspect's CV: CV d'Alain Aspect