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Observation of a collective mode of an array of transmon qubits

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Arrays of transmon qubits coupled to a λ/2 superconducting coplanar waveguide resonator have been studied by microwave spectroscopy. The emergence of a collective mode has been discovered for a cluster of N > 5 qubits, whose coupling constant to the electromagnetic field in the resonator is √N times greater compared to a single qubit. In addition, the emergence of collective multiphoton transitions exciting higher levels of a qubit cluster has been demonstrated and the interaction of an individual qubit with such a cluster has been investigated.

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Correspondence to K. V. Shulga.

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Original Russian Text © K.V. Shulga, P. Yang, G.P. Fedorov, M.V. Fistul, M. Weides, A.V. Ustinov, 2017, published in Pis’ma v Zhurnal Eksperimental’noi i Teoreticheskoi Fiziki, 2017, Vol. 105, No. 1, pp. 38–42.

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Shulga, K.V., Yang, P., Fedorov, G.P. et al. Observation of a collective mode of an array of transmon qubits. Jetp Lett. 105, 47–50 (2017).

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