John Clarke

Led in the understanding and the development of the SQUID (Superconducting Quantum Interference Device) and exploration of this high sensitivity device for fundamental studies and applications. He explored and demonstrated how this device can be used for measurements with a sensitivity up to the quantum mechanical limit. Studies have addressed the sources of 1/f noise, the limits of quantum computing, the applications of SQUIDs for geological exploration and medical imaging. He co-authored the handbook of SQUID applications for high sensitivity electromagnetic measurements in a wide variety of fields and is universally known for this work. His current interests include the application of SQUIDs as detectors in ultralow field magnetic resonance imaging and as amplifiers in a search for cold dark matter. He is involved in the development of superconducting magnetic flux qubits (quantum bits), with a particular interest in understanding and reducing sources of relaxation and decoherence to improve their performance.