Quantum state detection of a superconducting flux qubit using a DC-SQUID in the inductive mode

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dc.creatorLupascu, A.
dc.creatorHarmans, C. J. P. M.
dc.creatorMooij, J. E.
dc.date2004-10-28
dc.date.accessioned2026-07-07T08:04:13Z
dc.date.available2026-07-07T08:04:13Z
dc.descriptionWe present a readout method for superconducting flux qubits. The qubit quantum flux state can be measured by determining the Josephson inductance of an inductively coupled DC superconducting quantum interference device (DC-SQUID). We determine the response function of the DC-SQUID and its back-action on the qubit during measurement. Due to driving, the qubit energy relaxation rate depends on the spectral density of the measurement circuit noise at sum and difference frequencies of the qubit Larmor frequency and SQUID driving frequency. The qubit dephasing rate is proportional to the spectral density of circuit noise at the SQUID driving frequency. These features of the backaction are qualitatively different from the case when the SQUID is used in the usual switching mode. For a particular type of readout circuit with feasible parameters we find that single shot readout of a superconducting flux qubit is possible.
dc.description11 pages, 3 figures; submitted to Phys. Rev. B
dc.identifierhttps://arxiv.org/abs/cond-mat/0410730
dc.identifierhttp://arxiv.org/abs/cond-mat/0410730
dc.identifierPhys. Rev. B 71, 184506 (2005)
dc.identifierdoi:10.1103/PhysRevB.71.184506
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/129874
dc.subjectSuperconductivity
dc.subjectMesoscale and Nanoscale Physics
dc.subjectQuantum Physics
dc.titleQuantum state detection of a superconducting flux qubit using a DC-SQUID in the inductive mode
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