Unexpectedly Allowed Transition in Two Inductively Coupled Transmons

We present experimental results in which the unexpected zero-two transition of a circuit composed of two inductively coupled transmons is observed. This transition shows an unusual magnetic flux dependence with a clear disappearance at zero magnetic flux. In a transmon qubit, the symmetry of the wav...

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Bibliographic Details
Published in:IEEE transactions on applied superconductivity 2016-04, Vol.26 (3), p.1-4
Main Authors: Dumur, Etienne, Kung, Bruno, Feofanov, Alexey, Weissl, Thomas, Krupko, Yuriy, Roch, Nicolas, Naud, Cecile, Guichard, Wiebke, Buisson, Olivier
Format: Article
Language:English
Subjects:
Atomic measurements
Cavity resonator
Condensed Matter
Couplings
Inductance
Josephson junctions
Magnetic circuits
Magnetic resonance
Mesoscopic Systems and Quantum Hall Effect
Oscillators
Physics
Superconducting magnets
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Summary:We present experimental results in which the unexpected zero-two transition of a circuit composed of two inductively coupled transmons is observed. This transition shows an unusual magnetic flux dependence with a clear disappearance at zero magnetic flux. In a transmon qubit, the symmetry of the wave functions prevents this transition to occur due to selection rule. In our circuit, the Josephson effect introduces strong couplings between the two normal modes of the artificial atom. This leads to a coherent superposition of states from the two modes, enabling such transitions to occur.
ISSN:1051-8223
1558-2515
DOI:10.1109/TASC.2016.2515020