Coherent frequency conversion in a superconducting artificial atom with two internal degrees of freedom

Abstract

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 $|n_s⟩$ and $|n_a⟩$ 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 $|0_s,1_a⟩$ and $|2_s,0_a⟩$. Finally, coherent frequency conversion is observed via free oscillations between the states $|0_s,1_a⟩$ and $|2_s,0_a⟩$.

References in corpus (9)

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