French Scientist Michel H. Devoret Shares 2025 Nobel Prize in Physics for Macroscopic Quantum Mechanics

The Royal Swedish Academy of Sciences announced today that French physicist Michel H. Devoret, along with American scientists John Clarke and John M. Martinis, has been awarded the 2025 Nobel Prize in Physics. The laureates are honored 'for the discovery of macroscopic quantum mechanical tunnelling and energy quantisation in an electric circuit'. This pioneering work, conducted in the 1980s, has been instrumental in advancing the field of quantum computing and demonstrating quantum phenomena on a tangible scale.

The Groundbreaking Discovery

The Nobel Committee recognized the trio for their experiments that revealed quantum physics in action within an electrical circuit. Their research demonstrated two key quantum effects in superconducting circuits:

• Macroscopic quantum mechanical tunneling: This phenomenon allows particles to pass through seemingly impenetrable barriers, even without sufficient energy to overcome them, a concept typically observed at microscopic levels. The laureates showed this could occur in a system large enough to be held in the hand.
• Energy quantization: They also proved that the circuit could only exist in specific, discrete energy states, absorbing or emitting energy in fixed doses, a hallmark of quantum systems.

These findings challenged the conventional understanding that quantum mechanical effects were confined solely to the subatomic world, bridging the divide between the microscopic and macroscopic realms.

Impact on Quantum Technology

The work of Devoret, Clarke, and Martinis laid the fundamental groundwork for the development of superconducting quantum bits, or qubits, which are the basic components of modern quantum computers. Their experiments, particularly those involving Josephson junctions in superconducting circuits, showed that collective quantum objects could exhibit quantum behavior. This has had profound implications for the nascent field of quantum technology, including:

• The creation of quantum computers capable of solving complex problems beyond the reach of classical machines.
• Improvements in highly sensitive measurement devices like magnetometers and gravitational sensors.
• Advancements in secure communications and quantum cryptography.

Olle Eriksson, chair of the Nobel Committee for Physics, emphasized that 'There is no advanced technology today that does not rely on quantum mechanics'.

The Laureates and the Award

Michel H. Devoret, born in Paris, France, in 1953, earned his PhD from Paris-Sud University in 1982. He is currently a Professor at Yale University in New Haven, CT, and the University of California, Santa Barbara. His co-laureates, John Clarke, an emeritus professor at the University of California, Berkeley, and John M. Martinis, a professor at the University of California, Santa Barbara, conducted much of their prize-winning research together. The 11 million Swedish kronor prize will be shared equally among the three scientists. The official award ceremony is scheduled for December 10 in Stockholm.