Who Is John Clauser – One Of The Three Nobel Winning Of Quantum Physics?

Alain Aspect, John F. Clauser, and Anton Zeilinger have won this year's Nobel Prize in physics for their work in quantum mechanics, Sweden's Karolinska Institute announced on Tuesday.


The institute said the scientists had been recognized for “experiments with entangled photons, establishing the violation of Bell inequalities and pioneering quantum information science.”

One hour after he received the phone call, prize co-winner Zeilinger was still in shock.

“It’s a positive shock, I was surprised to get the call,” he said in an interview with the Nobel Prize committee.

“This prize is exciting for the field of quantum mechanics. On the fundamentals, many of the issues about realities and space time are still not answered. I expect some interesting work here in the coming years,” he said.

Work on quantum mechanics a new era for technology

Photo: Nobel Prize
Photo: Nobel Prize

The field of quantum mechanics stems from Niels Bohr and Max Planck, the two founding fathers of Quantum Theory.

Using groundbreaking experiments, Aspect, Clauser and Zeilinger demonstrated the potential to investigate and control particles that are in entangled states.

Their work on quantum mechanics has helped improve our understanding of how particles behave at the subatomic level.

Quantum physicists have shown that through quantum entanglement, information can be transferred instantaneously over long distances.

They sometimes talk of teleportation, but it’s usually to do with the teleportation of information — it is very unlikely that we will see human teleportation any time soon.

The laureates’ development of experimental tools has also laid the foundation for a new era of quantum technology, including quantum computing.

John Clauser’s biography

Photo: Reuters
Photo: Reuters

John Francis Clauser (born December 1, 1942) is an American theoretical and experimental physicist known for contributions to the foundations of quantum mechanics, in particular the Clauser–Horne–Shimony–Holt inequality.

Clauser was awarded the 2022 Nobel Prize in Physics, jointly with Alain Aspect and Anton Zeilinger “for experiments with entangled photons, establishing the violation of Bell inequalities and pioneering quantum information science”.

John Clauser received his B.S. in physics from the California Institute of Technology in 1964, his M.A. in physics in 1966 and Ph.D. in physics in 1969 from Columbia University.

Photo: ABC7 News
Photo: ABC7 News

From 1969 to 1996 he worked at Lawrence Berkeley National Laboratory, Lawrence Livermore National Laboratory, and the University of California, Berkeley.

John was awarded the Wolf Prize in Physics in 2010, together with Alain Aspect and Anton Zeilinger for their observations of non-local quantum entanglement and experimental tests of Local Realism.

In 1969, with Michael Horne, Abner Shimony, and Richard Holt, inspired by theoretical results by John Bell, he proposed the first test of local hidden variable theories, and provided the first experimentally testable CHSH-Bell’s Theorem prediction for these theories — the Clauser-Horne-Shimony-Holt (CHSH) inequality.

In 1972, working with Stuart Freedman, he carried out the first experimental test of the CHSH inequality’s prediction. This was the world’s first observation of non-local quantum entanglement, and was the first experimental observation of a violation of a Bell inequality.

Photo: BSS
Photo: BSS

In 1976 he carried out the world’s second experimental test of the CHSH inequality prediction.

In 1974, working with Michael Horne, he formulated the theory of Local Realism as a generalization of local hidden-variable theories, and first showed that a generalization of Bell’s Theorem provides severe constraints for all Local Realistic theories of nature. That work introduced the Clauser–Horne (CH) inequality as the first fully general experimental requirement set by Local Realism. It has only recently (2013) been tested experimentally. He also introduced the “CH no-enhancement assumption”, whereupon the CH inequality reduces to the CHSH inequality, and whereupon associated experimental tests also constrain Local Realism.

Photo: Physics World
Photo: Physics World

In 1974 he made the first observation of sub-Poissonian statistics for light (via a violation of the Cauchy–Schwarz inequality for classical electromagnetic fields), and thereby first experimentally proved that photons can behave like localized particles and not like brief pulses of electromagnetic radiation. In 1987-1991 he proposed (and patented) atom interferometers as useful ultra-sensitive inertial and gravity sensors. In 1992, with Matthias Reinsch, he first deduced the number-theoretic properties of the fractional Talbot effect, and invented the Talbot-Lau interferometer.

In 1990-1997, with Shifang Li, he first used Talbot-Lau interferometry to build an atom interferometer. In 1998 he invented and patented use of the Talbot-Lau interferometry for “Ultrahigh Resolution Interferometric X-ray Imaging”. This invention, in turn, allows x-ray phase-contrast medical imaging of soft tissue.

Charlotte Pho