|
Mesoscopic Josephson junction provides an unique opportunity to construct
ultra sensitive quantum detectors and amplifiers. These devices are
important when performing single shot read-out of quantum bits (qubits) or
making quantum measurements a la quantum optics style.
Our quantum amplifiers employ the
band model of the Josephson junction,
either in a single junction case (BOT) or in a double junction case
(L-SET and C-SET).
The ultimate goal is to develop phase sensitive quantum amplifiers,
parametric amplifiers that would allow for quantum non-demolition
measurements. |
Energy bands (eigenenergies of the Hamiltonian below) of a
superconducting SET with E_J/E_C=1.7 on the plane spanned by the "classical
variables", the gate charge q_g and the sum phase \phi. The quantum
variables are the difference phase \theta and island charge q=d/id\theta.
 |
