GERSHENSON LAB MESOSCOPIC PHYSICS and QUANTUM COMPUTING 


CURRENT RESEARCH: Realization of Protected Quantum Bits (qubits) based on ultrasmall Josephson junctions. The goal is
to develop a fundamentally new class of superconducting logical elements of a
quantum computer that would be protected from all sources of local
noises. In particular, we have
developed two novel Josephson circuits intended as prototypes of protected
qubits whose logical states are decoupled from the environment by encoding
them in a parity of a large number (either the number of Cooper pairs on a
small superconducting island, or the number of fluxons in a Quantum
Phase Transitions in Unconventional Josephson Arrays. The study of charge transport in novel types of the arrays of
submicron Josephson junction (the arrays with a large number of
nearestneighbor elements, arrays with a large number of junctions per unit
cell, and arrays with nontrivial topologies)
addresses several fundamental problems of the physics of quantum
disordered systems, including quantum phase transitions in systems with and
without longrange interactions, emergent glassy behavior, and formation of
topological phases. RECENT PROJECTS: Quantum
transport and interactions in mesoscopic conductors,
with special emphasis on the decoherence effects in
lowdimensional conductors at ultralow temperatures. Electronphonon
interaction in metals and semiconductors at ultralow temperatures.
The applied aspects of this research involve the development
of ultrasensitive hotelectron detectors of submillimeter and far infrared
electromagnetic radiation for the deepspace NASA missions (in collaboration
with the Jet Propulsion Lab and Yale). Quantum
effects in the conductivity of highmobility Si MOSFETs at ultralow temperatures. In particular, we have studied the electronelectron
interactions in twodimensional systems in the regime of low carrier
densities. Electronic
effects in single crystals of organic molecular semiconductors,
including the development of novel fieldeffect devices based
on organic crystals and exploring the fundamental processes that determine
operation and ultimate performance of organic electronic devices. Vitaly
Podzorov, who became a faculty at For the
fabrication of nanoscale electronic structures we have developed the Our research was supported by the NSF, DARPA, and Templeton
Foundation


