Journal
QUANTUM INFORMATION PROCESSING
Volume 8, Issue 2-3, Pages 155-182Publisher
SPRINGER
DOI: 10.1007/s11128-009-0094-0
Keywords
Superconducting qubit device; Josephson quantum nano-circuits
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We have studied different quantum dynamics of superconducting nano-circuits with Josephson junctions. A dc SQUID, when it is strongly decoupled from the environment, demonstrates two-level and multilevel dynamics. We have realized a two qubits coupled circuit based on a dc SQUID in parallel with an asymmetric Cooper pair transistor (ACPT). The ACPT behaves as a charge qubit. Its asymmetry produces a strong tunable coupling with the dc SQUID which is used to realize entangled states between the two qubits and new read-out of the charge qubit based on adiabatic quantum transfer. We have measured the current-phase relations of different rhombi chains in the presence or absence of quantum fluctuations which confirm theoretical predictions.
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