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Josephson junctions (JJs) with Josephson energy EJ≲1 K are widely employed as non-linear elements in superconducting circuits for quantum computing operating at milli-Kelvin temperatures. In the qubits with small charging energy EC ( EJ/EC≫1 ), such as the transmon, the incoherent phase slips (IPS) might become the dominant source of dissipation with decreasing EJ. In this work, a systematic study of the IPS in low-EJ JJs at milli-Kelvin temperatures is reported. Strong suppression of the critical (switching) current and a very rapid growth of the zero-bias resistance due to the IPS are observed with decreasing EJ below 1 K. With further improvement of coherence of superconducting qubits, the observed IPS-induced dissipation might limit the performance of qubits based on low-EJ junctions. These results point the way to future improvements of such qubits.
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Kamenov, Plamen; Lu, Wen-Sen; Kalashnikov, Konstantin; DiNapoli, Thomas; Bell, Matthew T.; Gershenson, Michael E. (, Physical Review Applied)
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Kalashnikov, Konstantin; Hsieh, Wen Ting; Zhang, Wenyuan; Lu, Wen-Sen; Kamenov, Plamen; Di Paolo, Agustin; Blais, Alexandre; Gershenson, Michael E.; Bell, Matthew (, PRX Quantum)null (Ed.)
