Measurement crosstalk between two phase qubits coupled by a coplanar waveguide

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en Altomare, Fabio Cicak, Katarina Sillanpää, Mika A. Allman, Michael S. Sirois, Adam J. Li, Dale Park, Jae I. Strong, Joshua A. Teufel, John D. Whittaker, Jed D. Simmonds, Raymond W. 2018-05-22T14:50:02Z 2018-05-22T14:50:02Z 2010-09-01
dc.identifier.citation Altomare , F , Cicak , K , Sillanpää , M A , Allman , M S , Sirois , A J , Li , D , Park , J I , Strong , J A , Teufel , J D , Whittaker , J D & Simmonds , R W 2010 , ' Measurement crosstalk between two phase qubits coupled by a coplanar waveguide ' PHYSICAL REVIEW B , vol 82 , no. 9 , 094510 , pp. 1-7 . DOI: 10.1103/PhysRevB.82.094510 en
dc.identifier.issn 1098-0121
dc.identifier.issn 1550-235X
dc.identifier.other PURE UUID: db2ca333-29be-4984-a543-4087cc533c32
dc.identifier.other PURE ITEMURL:
dc.identifier.other PURE LINK:
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dc.description.abstract We investigate measurement crosstalk in a system with two flux-biased phase qubits coupled by a resonant coplanar waveguide cavity. After qubit measurement, the superconducting phase undergoes damped oscillations in a deep anharmonic potential producing a frequency chirped voltage or crosstalk signal. We show experimentally that a coplanar waveguide cavity acts as a bandpass filter that can significantly reduce the propagation of this crosstalk signal when the qubits are far off resonance from the cavity. The transmission of the crosstalk signal ∝(ωqCx)2 can be further minimized by reducing the qubit frequencies and the coupling capacitance to the cavity. We model the large amplitude crosstalk signal and qubit response classically with results that agree well with the experimental data. We find that the maximum energy transferred by the crosstalk generating qubit roughly saturates for long energy relaxation times (T1>100 ns) while the delay time necessary for the crosstalk signal to propagate to the cavity scales linearly with T1. Ultimately, the use of resonant cavities as coupling elements and crosstalk filters is extremely beneficial for future architectures incorporating many coupled qubits. en
dc.format.extent 7
dc.format.extent 1-7
dc.format.mimetype application/pdf
dc.language.iso en en
dc.relation.ispartofseries PHYSICAL REVIEW B en
dc.relation.ispartofseries Volume 82, issue 9 en
dc.rights openAccess en
dc.subject.other 114 Physical sciences en
dc.subject.other 3112 Neurosciences en
dc.subject.other 113 Computer and information sciences en
dc.subject.other 217 Medical engineering en
dc.subject.other 3124 Neurology and psychiatry en
dc.subject.other 515 Psychology en
dc.title Measurement crosstalk between two phase qubits coupled by a coplanar waveguide en
dc.type A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä fi
dc.description.version Peer reviewed en
dc.contributor.department Department of Applied Physics
dc.subject.keyword coplanar waveguide
dc.subject.keyword measurement crosstalk
dc.subject.keyword phase qubits
dc.subject.keyword 114 Physical sciences
dc.subject.keyword 3112 Neurosciences
dc.subject.keyword 113 Computer and information sciences
dc.subject.keyword 217 Medical engineering
dc.subject.keyword 3124 Neurology and psychiatry
dc.subject.keyword 515 Psychology
dc.identifier.urn URN:NBN:fi:aalto-201805222644
dc.identifier.doi 10.1103/PhysRevB.82.094510
dc.type.version publishedVersion

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