Journal
QUANTUM INFORMATION PROCESSING
Volume 8, Issue 2-3, Pages 183-198Publisher
SPRINGER
DOI: 10.1007/s11128-009-0097-x
Keywords
Single Cooper-pair box; Qubit; RF-SET; Quantum capacitance
Funding
- Jet Propulsion Laboratory, California Institute of Technology
- National Aeronautics and Space Administration (NASA)
- National Security Agency
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We describe in this review progress in techniques for measuring the quantum states of the single Cooper-pair box (SCB) at the Jet Propulsion Laboratory, and the use of these techniques to characterize their performance as quantum bits. Initially, the Radio-Frequency-Single-Electron Transistor was used to measure conventional and differential versions of the SCB. To overcome some of the difficulties associated with the radio-frequency single-electron transistor, a transition was made to readout based on the quantum capacitance technique. Using this method, entanglement between two SCBs was demonstrated spectroscopically and with ground state characterization.
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