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- Title
Phase Diffusion in Low- E J Josephson Junctions at Milli-Kelvin Temperatures.
- Authors
Lu, Wen-Sen; Kalashnikov, Konstantin; Kamenov, Plamen; DiNapoli, Thomas J.; Gershenson, Michael E.
- Abstract
Josephson junctions (JJs) with Josephson energy E J ≲ 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 E C ( E J / E C ≫ 1 ), such as the transmon, the incoherent phase slips (IPS) might become the dominant source of dissipation with decreasing E J . In this work, a systematic study of the IPS in low- E J 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 E J 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- E J junctions. These results point the way to future improvements of such qubits.
- Subjects
JOSEPHSON junctions; QUANTUM computing; SUPERCONDUCTING circuits; QUBITS; CIRCUIT elements; TEMPERATURE
- Publication
Electronics (2079-9292), 2023, Vol 12, Issue 2, p416
- ISSN
2079-9292
- Publication type
Article
- DOI
10.3390/electronics12020416