Coherent Frequency Conversion in a Superconducting Artificial Atom with Two Internal Degrees of Freedom
F. Lecocq, I. M. Pop, I. Matei, E. Dumur, A. K. Feofanov, C. Naud, W. Guichard, O. Buisson
DOI 10.1103/PhysRevLett.108.107001 · Physical Review Letters
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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 (s mode) which gives rise to the phase qubit, an antisymmetric mode (a mode) appears. These two modes can be described by two anharmonic oscillators with eigenstates |ns⟩ and |na⟩ for the s and a mode, respectively. We show that a strong nonlinear coupling between the modes leads to a large energy splitting between states |0s,1a⟩ and |2s,0a⟩. Finally, coherent frequency conversion is observed via free oscillations between the states |0s,1a⟩ and |2s,0a⟩.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Al Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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