Phase Diffusion in Low-$E_J$ Josephson Junctions at milli-Kelvin
Temperatures
- URL: http://arxiv.org/abs/2112.10870v1
- Date: Mon, 20 Dec 2021 21:27:42 GMT
- Title: Phase Diffusion in Low-$E_J$ Josephson Junctions at milli-Kelvin
Temperatures
- Authors: Wen-Sen Lu, Konstantin Kalashnikov, Plamen Kamenov, Thomas J.
DiNapoli, Michael E. Gershenson
- Abstract summary: Josephson junctions (JJs) with Josephson energy $E_J lesssim 1K$ are widely employed as non-linear elements in superconducting circuits for quantum computing.
We experimentally study incoherent phase slips (IPS) in low-$E_J$ Aluminum-based JJs at $T0.2K$, where the IPS become the dominant source of dissipation.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: Josephson junctions (JJs) with Josephson energy $E_J \lesssim 1K$ are widely
employed as non-linear elements in superconducting circuits for quantum
computing, operating at milli-Kelvin temperatures. Here we experimentally study
incoherent phase slips (IPS) in low-$E_J$ Aluminum-based JJs at $T<0.2K$, where
the IPS become the dominant source of dissipation. We observed strong
suppression of the critical (switching) current and a very rapid growth of the
zero-bias resistance with decreasing Josephson energy below $E_J \sim 1K$. This
behavior is attributed to the IPSs whose rate exponentially increases with
decreasing the ratio $E_J/T$. Our observations are in line with other data
reported in literature. With further improvement of coherence of
superconducting qubits, the observed dissipation from IPS might limit the
performance of qubits based on low-$E_J$ junctions.
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