Coherent frequency conversion in a superconducting artificial atom with two internal degrees of freedom
| Autor: | Iulian Matei, Olivier Buisson, Etienne Dumur, Wiebke Guichard, A. K. Feofanov, Florent Lecocq, Cécile Naud, I. M. Pop |
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| Přispěvatelé: | Circuits électroniques quantiques Alpes (QuantECA), Institut Néel (NEEL), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF), Nanoscience Fondation, IUF, ANR et CEE, European Project: 248629,EC:FP7:ICT,FP7-ICT-2009-4,SOLID(2010), Circuits électroniques quantiques Alpes (NEEL - QuantECA), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2012 |
| Předmět: |
Physics
Superconductivity Physics::General Physics Condensed Matter - Mesoscale and Nanoscale Physics Antisymmetric relation Anharmonicity Degrees of freedom (physics and chemistry) General Physics and Astronomy FOS: Physical sciences frequency conversion Plasma Quantum Physics 01 natural sciences non linear coupling 010305 fluids & plasmas Phase qubit Inductance Quantum mechanics 0103 physical sciences Mesoscale and Nanoscale Physics (cond-mat.mes-hall) Atomic physics Superconducting qubits 010306 general physics [PHYS.COND.CM-MSQHE]Physics [physics]/Condensed Matter [cond-mat]/Mesoscopic Systems and Quantum Hall Effect [cond-mat.mes-hall] Quantum computer |
| Zdroj: | Physical Review Letters Physical Review Letters, American Physical Society, 2012, 108 (10), pp.107001. ⟨10.1103/PhysRevLett.108.107001⟩ Physical Review Letters, 2012, 108 (10), pp.107001. ⟨10.1103/PhysRevLett.108.107001⟩ |
| ISSN: | 0031-9007 1079-7114 |
| DOI: | 10.1103/PhysRevLett.108.107001⟩ |
| Popis: | 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 $\ket{2_{s},0_{a}}$. |
| Databáze: | OpenAIRE |
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