Single-Shot Readout of Macroscopic Quantum Superposition State in a Superconducting Flux Qubit

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Single-shot readout experiments were performed on the two lowest-energy states of a superconducting qubit with three Josephson junctions embedded in a superconducting loop. We measured the qubit state via switching current Isw of a current-biased dc-SQUID, a quantum detector surrounding the qubit loop. The qubit signals were measured in a small Isw regime of the SQUID, typically less than 100 nA, where the Isw distribution is particularly narrow. The obtained single-shot data indicate that the qubit state is readout, through the flux generated by the qubit persistent-current, as energy eigenstates rather than current eigenstates.
5 pages, 6 figures

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Superconductivity

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http://salesiana.dossiersoluciones.com/handle/123456789/24402

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/cond-mat/0407299
 http://arxiv.org/abs/cond-mat/0407299

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arXiv