{"paper":{"title":"Coherent frequency conversion in a superconducting artificial atom with two internal degrees of freedom","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.mes-hall","authors_text":"A. K. Feofanov (NEEL), C\\'ecile Naud (NEEL), Etienne Dumur (NEEL), Florent Lecocq (NEEL), Ioan M. Pop (NEEL), Iulian Matei (NEEL), Olivier Buisson (NEEL), Wiebke Guichard (NEEL)","submitted_at":"2012-01-19T15:37:26Z","abstract_excerpt":"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 $\\k"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1201.4085","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}