Colloquium: Venkat Chandrasekhar: "Macroscopic Quantum Tunneling and Quantum Electronic Circuits -- The 2025 Nobel Prize in Physics"

The 2025 Nobel Prize in Physics was awarded to John Clarke, John Martinis and Michel Devoret “for the discovery of macroscopic quantum mechanical tunnelling and energy quantisation in an electric circuit.”  In this talk, I will review the classical and quantum dynamics of a Josephson junction, the basic device behind the experiments of Clarke, Martinis and Devoret, and discuss some of the issues involved in making measurements on such devices at millikelvin temperatures, focusing in particular on the effects of noise on the experimental results.

Venkat Chandrasekhar, Professor, Northwestern University

Host: John J. Carrasco

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