Journal
QUANTUM INFORMATION PROCESSING
Volume 8, Issue 2-3, Pages 199-215Publisher
SPRINGER
DOI: 10.1007/s11128-009-0098-9
Keywords
Quantum bits; Josephson junctions; Entangled state; JBA: Josephson bifurcation amplifier
Funding
- Scientific Research of Specially Promoted Research [18001002]
- MEXT [18201018]
- CREST program
- Japan Science and Technology Agency (JST)
- Grants-in-Aid for Scientific Research [18001002, 18201018] Funding Source: KAKEN
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Quantum state control including entanglement, and readout of the Josephson persistent-current qubit, flux qubit, are reviewed. First, we mention our single-shot readout of quantum superposition state of a flux qubit by a current biased dc-SQUID. Second, we mention entangled state and vacuum Rabi oscillations of a flux-qubit LC-resonator system where qubit-resonator coupled state are controlled by a combination of microwave and DC-shift pulses, resulting in a controlling and measuring sequence analogous to atomic cavity QED. Third, we report our recent progress in high fidelity readout of a flux qubit state via Josephson bifurcation amplifier (JBA).
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