Publications (9)
Breather decay into a vortex/anti-vortex pair in a Josephson Ladder
K. Segall, P. Williams, O. Svitelskiy +4
We present experimental evidence for a new behavior which involves discrete breathers and vortices in a Josephson Ladder. Breathers can be visualized as the creation and subsequent…
Multiple junction biasing of superconducting tunnel junction detectors
K. Segall, J. J. Mazo, T. P. Orlando
We describe a new biasing scheme for single photon detectors based on superconducting tunnel junctions. It replaces a single detector junction with a circuit of three junctions and…
DC measurements of macroscopic quantum levels in a superconducting qubit structure with a time-ordered meter
D. S. Crankshaw, K. Segall, D. Nakada +7
DC measurements are made in a superconducting, persistent current qubit structure with a time-ordered meter. The persistent-current qubit has a double-well potential, with the two…
Self-training superconducting neuromorphic circuits using reinforcement learning rules
M. L. Schneider, E. M. Jué, M. R. Pufall +2
Reinforcement learning algorithms are used in a wide range of applications, from gaming and robotics to autonomous vehicles. In this paper we describe a set of reinforcement learni…
Dynamics and Energy Distribution of Non-Equilibrium Quasiparticles in Superconducting Tunnel Junctions
K. Segall, C. Wilson, L. Li +4
We present a full theoretical and experimental study of the dynamics and energy distribution of non-equilibrium quasiparticles in superconducting tunnel junctions (STJs). STJs are…
Impact of time-ordered measurements of the two states in a niobium superconducting qubit structure
K. Segall, D. Crankshaw, D. Nakada +7
Measurements of thermal activation are made in a superconducting, niobium Persistent-Current (PC) qubit structure, which has two stable classical states of equal and opposite circu…
Thermal depinning of fluxons in discrete Josephson rings
J. J. Mazo, F. Naranjo, K. Segall
We study the thermal depinning of single fluxons in rings made of Josephson junctions. Due to thermal fluctuations a fluxon can be excited from its energy minima and move through t…
Fan-out and Fan-in properties of superconducting neuromorphic circuits
M. L. Schneider, K. Segall
Neuromorphic computing has the potential to further the success of software-based artificial neural networks (ANNs) by designing hardware from a different perspective. Current rese…
Switching Current Measurements in Josephson Rings
K. Segall, A. Dioguardi, N. Fernandes +1
We present switching current measurements in niobium-aluminum oxide-niobium underdamped Josephson rings. Underdamped Josephson rings display hysteretic current-voltage curves which…