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GERSHENSON LAB

MESOSCOPIC PHYSICS and QUANTUM COMPUTING

 

 

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Quantum Phase Transitions in Unconventional Josephson Arrays

The research focuses on the fundamental unsolved problems of the physics of quantum disordered systems, including quantum phase transitions in systems with and without long-range interactions, emergent glassy behavior, and formation of topological phases. We plan to address these problems by studying the charge transport in novel types of the arrays of sub-micron Josephson junction with unconventional geometry: the arrays with a large number of nearest-neighbor elements, arrays with a large number of junctions per unit cell, and arrays with non-trivial topologies.

We hope that these experiments will provide an important test of different models of the “bosonic” superconductor-insulator transition, shed light on the long-standing issue of the enigmatic “metallic” phase frequently observed in Josephson arrays and ultra-thin superconducting films, and address fundamental open questions of the physics of electronic glasses.

Exploration of these issues is conceptually important for better understanding of the origin of decoherence and noise in quantum systems at low temperatures.

 

 

 

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