L-R: British physicist John Clarke at the University of California, USA, French physicist Michel H Devoret (University of California and Yale) and US physicist John M Martinis (University of California)
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Briton John Clarke, Frenchman Michel Devoret and American John Martinis won the Nobel Prize in Physics on Tuesday for work on quantum physics in action, the Nobel jury said.
The trio was honoured "for the discovery of macroscopic quantum mechanical tunnelling and energy quantisation in an electric circuit", the jury said.
Quantum mechanics describes how differently things work on incredibly small scales.
For example, when a normal ball hits a wall, it bounces back. But on the quantum scale, a particle will actually pass straight through a comparable wall -- a phenomenon called "tunnelling".
Tuesday's prize was awarded for experiments in the 1980s which showed that quantum tunnelling can also be observed on a macroscopic scale -– involving multiple particles –- by using superconductors.
In a series of experiments, the researchers demonstrated that "the bizarre properties of the quantum world can be made concrete in a system big enough to be held in the hand", the Royal Swedish Academy of Sciences said in a statement.
"This prize is awarding an experiment that brings the scale up to the macroscopic scale, scales that we can understand and measure through human standards," Ulf Danielsson, secretary of the Nobel physics committee and a professor of theoretical physics at Uppsala University, told AFP.
The jury noted that the discoveries had "provided opportunities for developing the next generation of quantum technology, including quantum cryptography, quantum computers and quantum sensors".
"It is wonderful to be able to celebrate the way that century-old quantum mechanics continually offers new surprises.
"It is also enormously useful, as quantum mechanics is the foundation of all digital technology," Olle Eriksson, chair of the Nobel Committee for Physics, said in a statement.
Clarke, 83, is a professor at the University of California, Berkeley.
Devoret, 72, is a professor at University of California, Santa Barbara and is listed as a professor emeritus at Yale University.
Martinis, born 1958, is also a professor at the University of California, Santa Barbara.
"To put it mildly, it was the surprise of my life," Clarke told reporters via telephone during the prize announcement, about learning of his award.
"It never occurred to me in any way that this might be the basis of a Nobel prize," Clarke added.
Clarke explained that the scientists had been focused on the physics of their experiments and had not realised at the time the practical applications that could follow.
"It certainly had not occurred to us in any way that this discovery would have such a significant impact," Clarke said.
Asked about how their discoveries had affected everyday life, Clarke noted that he was speaking to the audience via his mobile phone.
"One of the underlying reasons that the cell phone works is because of all this work," Clarke said.
The physics prize is the second Nobel of the season.
The Nobel Prize in Medicine was awarded on Monday to a US-Japanese trio for research into the human immune system.
Mary Brunkow and Fred Ramsdell, of the United States, and Japan's Shimon Sakaguchi were recognised by the Nobel jury for identifying immunological "security guards".
Last year, the Nobel Prize in Physics went to British-Canadian Geoffrey Hinton and American John Hopfield for their pioneering work on the foundations of artificial intelligence.
Both Hinton and Hopfield warned that their discoveries carried profound risks to society and humanity.
The physics prize will be followed by the chemistry prize on Wednesday, the literature prize on Thursday, and the highly watched Nobel Peace Prize on Friday.
The economics prize wraps up the 2025 Nobel season on October 13.
The Nobel consists of a diploma, a gold medal and a $1.2-million cheque, to be shared if there is more than one winner in a discipline.
The laureates will receive their prizes from Sweden's King Carl XVI Gustaf at a formal ceremony in Stockholm on December 10.
That date is the anniversary of the death in 1896 of scientist Alfred Nobel, who created the prizes in his will.
