John Clarke

University of California, Berkeley


Election Year: 2012
Primary Section: 13, Physics
Membership Type: International Member

Research Interests

Quantum Information: With Irfan Siddiqi, UC Berkeley. My main focus is on superconducting qubits based on Josephson junctions. I study limitations to the relaxation and decoherence times imposed by 1/f flux noise. Although it is generally accepted that the noise is generated by the reversal of spins on the surface of the superconductor, details of the mechanism and techniques to reduce the noise remain obscure.  Ultralow Field Magnetic Resonance Imaging: With Ben Inglis, UC Berkeley and Hui Dong, Shanghai. We are involved in several research topics, including imaging of the human brain, study of stroke in rat brains with potential application to the determination of the elapsed time since stroke in humans. and a detailed study of the relaxation and decoherence times in large molecules.   Searching for Axion Dark Matter: With the Axion Collaboration, based at the University of Washington, Seattle. The axion is a highly motivated candidate for the cold dark matter that comprises 85% of the mass of the Universe.  I have worked in this collaboration for 25 years since developing the high-frequency SQUID amplifier that enabled the use of the axion haloscope, a microwave cavity in a high magnetic field, to search for axions.

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