GERSHENSON LAB MESOSCOPIC PHYSICS and QUANTUM COMPUTING |
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CURRENT RESEARCH: Realization of Protected Quantum Bits (qubits) based on ultra-small 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 many-body 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 time-domain techniques
developed for the characterization of superconducting qubits at ultra-low
temperatures. PAST PROJECTS: Quantum
transport and interactions in mesoscopic conductors,
with special emphasis on the decoherence effects in
low-dimensional conductors at ultra-low temperatures. Electron-phonon
interaction in metals and semiconductors at ultra-low temperatures.
The applied aspects of this research involve the development
of ultra-sensitive hot-electron detectors of submillimeter and far infra-red electromagnetic
radiation for the deep-space NASA missions (in collaboration with the Jet
Propulsion Lab and Yale). Quantum
effects in the conductivity of high-mobility Si MOSFETs at ultra-low
temperatures.
In particular, we have studied the electron-electron
interactions in two-dimensional systems in the regime of low carrier
densities. Electronic
effects in single crystals of organic molecular semiconductors,
including the development of novel field-effect 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
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