2013
DOI: 10.1088/0953-4075/46/22/224019
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Effects of quasiparticle tunnelling in a circuit-QED realization of a strongly driven two-level system

Abstract: Abstract. We experimentally and theoretically study the frequency shift of a driven cavity coupled to a superconducting charge qubit. In addition to previous studies, we here also consider drive strengths large enough to energetically allow for quasiparticle creation. Quasiparticle tunneling leads to the inclusion of more than two charge states in the dynamics. To explain the observed effects, we develop a master equation for the microwave dressed charge states, including quasiparticle tunneling. A bimodal beh… Show more

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Cited by 6 publications
(4 citation statements)
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References 44 publications
(106 reference statements)
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“…(Wilson et al, 2007(Wilson et al, , 2010, where an emphasis was made on the dressed state description, and in Refs. Leppäkangas et al, 2013), where the emphasis was made on quasiparticle tunneling. An analogous qubit was also probed by a nanomechanical resonator (LaHaye et al, 2009), where a charge qubit state influenced the displacement of the resonator, of which the resonant frequency was probed.…”
Section: A Superconducting Circuitsmentioning
confidence: 99%
“…(Wilson et al, 2007(Wilson et al, , 2010, where an emphasis was made on the dressed state description, and in Refs. Leppäkangas et al, 2013), where the emphasis was made on quasiparticle tunneling. An analogous qubit was also probed by a nanomechanical resonator (LaHaye et al, 2009), where a charge qubit state influenced the displacement of the resonator, of which the resonant frequency was probed.…”
Section: A Superconducting Circuitsmentioning
confidence: 99%
“…In particular, we demonstrate that in a specific experimentally feasible parameter regime, squeezing at a high photon number can be achieved even in the presence of maximum gate-charge disorder. It follows that this device is robust against strong thermal noise in the DC-voltage bias 34 and nonequilibrium quasiparticles in the CPTs [35][36][37][38] .…”
Section: Introductionmentioning
confidence: 87%
“…[812]). There have been several experiments studying LZSM physics in strongly driven SQCs and similar systems [158,325,337,[813][814][815][816][817]. Extensions to a biharmonic drive [818] and multiple qubits [819] have also been studied.…”
Section: Strongly Driven Multiphoton Processesmentioning
confidence: 99%