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arXiv: 1201.4085

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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, Iulian Matei 1, Etienne Dumur 1, Olexiy Feofanov 1, Cécile Naud 1, Wiebke Guichard 1, Olivier Buisson 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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From: Olivier Buisson <>

Submitted on: Thursday, 19 January 2012 09:59:22

Updated on: Monday, 7 May 2012 13:39:56