Trio win Nobel for revealing quantum physics in action, Pg21.

Key Highlights:

• John Clarke, Michel Devoret, and John Martinis won the Nobel Prize in Physics for demonstrating macroscopic quantum mechanical tunnelling and energy quantisation in an electric circuit.
• Their experiments in the mid-1980s at the University of California, Berkeley, used superconductors separated by a thin insulator, similar to a Josephson junction.
• They proved that entire electric circuits, not just individual electrons, can exhibit quantum behavior like existing in discrete energy states.
• This work paved the way for the development of quantum computers and qubits.

Detailed Insights:

• Quantum mechanics governs the behavior of very small particles, showcasing phenomena like superposition and tunnelling, which are not typically observed in larger objects.
• The trio's research validated Tony Leggett's prediction that quantum behavior could be observed on a macroscopic level using a Josephson junction.
• Their meticulous isolation of the experimental setup was crucial to prevent environmental interference and accurately demonstrate macroscopic quantum tunnelling.
• The demonstration of quantum behavior on a macroscopic scale, though initially unnoticed, laid the foundation for creating qubits, the fundamental units of information in quantum computers.

Scientific/Technical Concepts Involved:

• Superconductivity: A phenomenon where electrons move without resistance in certain materials at very low temperatures.
• Quantum Tunnelling: The ability of a particle to pass through a potential barrier, even if it doesn't have enough energy to overcome it classically.
• Qubit: A quantum bit, the basic unit of information in a quantum computer, existing in a superposition of states.