181 articles – 211 references  [version française]
 HAL: hal-00661286, version 1
 arXiv: 1201.4085
 Physical Review Letters 108, 10 (2012) 107001
 Coherent frequency conversion in a superconducting artificial atom with two internal degrees of freedom
 Florent Lecocq 1, Ioan M. Pop 1
 (2012-03-09)
 By adding a large inductance in a dc-SQUID phase qubit loop, one decouples the junctions' dynamics and creates a superconducting artificial atom with two internal degrees of freedom. In addition to the usual symmetric plasma mode ({\it s}-mode) which gives rise to the phase qubit, an anti-symmetric mode ({\it a}-mode) appears. These two modes can be described by two anharmonic oscillators with eigenstates $\ket{n_{s}}$ and $\ket{n_{a}}$ for the {\it s} and {\it a}-mode, respectively. We show that a strong nonlinear coupling between the modes leads to a large energy splitting between states $\ket{0_{s},1_{a}}$ and $\ket{2_{s},0_{a}}$. Finally, coherent frequency conversion is observed via free oscillations between the states $\ket{0_{s},1_{a}}$ and $\ket{2_{s},0_{a}}$.
 1: Institut Néel (NEEL) CNRS : UPR2940 – Université Joseph Fourier - Grenoble I – Institut National Polytechnique de Grenoble (INPG)
 Research team: CQ
 Subject : Physics/Condensed Matter/Mesoscopic Systems and Quantum Hall Effect
 Keyword(s): Superconducting qubits – frequency conversion – non linear coupling
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 hal-00661286, version 1 http://hal.archives-ouvertes.fr/hal-00661286 oai:hal.archives-ouvertes.fr:hal-00661286 From: Olivier Buisson <> Submitted on: Thursday, 19 January 2012 09:59:22 Updated on: Monday, 7 May 2012 13:39:56