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 superconducting loop). Quantum
Phase Transitions in Unconventional Josephson Arrays. This research addresses two
fundamental problems of quantum mechanics of interacting quantum systems: the
quantum phase transitions in one dimension, and the manybody localization in
complex quantum systems isolated from the environment. To address these
phenomena, we develop novel arrays of nanoscale Josephson junctions designed to emulate the range of quantum models. The objectives are to explore the emergence of
novel symmetries near the quantum critical point and the dynamics of these
novel systems using the microwave spectroscopic and timedomain techniques
developed for the characterization of superconducting qubits at ultralow
temperatures. PAST 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 is supported by the NSF and DARPA


