In 1985, experiments revealed the quantum behaviour of a macroscopic degree of freedom: the phase difference across a Josephson junction. The authors recount the history of this milestone for the development of superconducting quantum circuits.
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Acknowledgements
M.H.D. acknowledges support from the Army Research Office and Air Force Office of Scientific Research.
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Martinis, J.M., Devoret, M.H. & Clarke, J. Quantum Josephson junction circuits and the dawn of artificial atoms. Nat. Phys. 16, 234–237 (2020). https://doi.org/10.1038/s41567-020-0829-5
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DOI: https://doi.org/10.1038/s41567-020-0829-5
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