72 citations · 309 across the 11 of their papers we have counts for
11 papers
Microstrip filters for measurement and control of superconducting qubits
Luigi Longobardi, Douglas A. Bennett, Vijay Patel +2
Careful filtering is necessary for observations of quantum phenomena in superconducting circuits at low temperatures. Measurements of coherence between quantum states requires exte…
Decoherence in rf SQUID Qubits
Douglas A. Bennett, Luigi Longobardi, Vijay Patel +3
We report measurements of coherence times of an rf SQUID qubit using pulsed microwaves and rapid flux pulses. The modified rf SQUID, described by an double-well potential, has inde…
Temperature Dependence of Critical Current Fluctuations in Nb/AlO/Nb Josephson Junctions
Shawn Pottorf, Vijay Patel, James E. Lukens
We have measured the low frequency critical current noise in Nb/AlO/Nb Josephson junctions. Unshunted junctions biased above the gap voltage and resistively shunted…
Measurement of Dissipation of a Three-Level rf SQUID Qubit
Shao-Xiong Li, Wei Qiu, Zhongyuan Zhou +4
The dissipation-induced relaxation (T_1) time of a macroscopic quantum system - a \{lambda}-type three-level rf SQUID flux qubit weakly coupled to control and readout circuitry (CR…
Crossover from Kramers to phase-diffusion switching in hysteretic DC-SQUIDs
J. Mannik, S. Li, W. Qiu +4
We have measured and propose a model for switching rates in hysteretic DC-SQUID in the regime where phase diffusion processes start to occur. We show that the switching rates in th…
Aluminum Oxide Layers as Possible Components for Layered Tunnel Barriers
E. Cimpoiasu, S. K. Tolpygo, X. Liu +5
We have studied transport properties of Nb/Al/AlOx/Nb tunnel junctions with ultrathin aluminum oxide layers formed by (i) thermal oxidation and (ii) plasma oxidation, before and af…