L’inscription est gratuite et rapide.
Lecture series on “Macroscopic quantum phenomena in Josephson junctions (and related structures)” by Dr. Edward Goldobin
Although Josephson junction are already quantum mechanical devices, their behavior is often described by the classical equations, which link, for example, the supercurrent through the junction with the phase across it. However, in certain conditions, these macroscopic variables can again exhibit quantum mechanical properties. For example, the phase across the junction may be not well defined, but smeared and described by a probability cloud in a quantum mechanical sense. Then it can also tunnel through the barrier from one state to the other or even form a coherent superposition of these two states.
During the last 15 years enormous progress was achieved in the field of macroscopic quantum effects, in particular, using Josephson junctions. Several types of qubits – coherent quantum mechanical two-level systems – were experimentally demonstrated by different groups. Decoherence, which spoils coherent quantum evolution, was drastically reduced allowing many quantum operations to be performed coherently in a row.
In these lectures, I will introduce the basic concepts and will show how one can build simple qubits and perform trivial quantum manipulations/computations, on the basis of Josephson junctions. These lectures will be structured in four chapters:
- From single Josephson junction to phase-qubit
- From single electron tunneling to charge-qubit
- Cavity and Circuit QED
- Fractional flux quanta in novel Josephson devices
Publication in Physical Review Letters: « Direct Evidence of Flexomagnetoelectric Effect Revealed by Single-Molecule Spectroscopy »