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

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

2004-07-12

arxiv.org/abs/cond-mat/0407299v1

Physics

Condensed Matter

Superconductivity

5 pages, 6 figures

Scientific paper

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.

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