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Optimizing Anharmonicity in Nanoscale Weak Link Josephson Junction Oscillators

Josephson tunnel junctions are widely used as nonlinear elements in superconducting circuits such as low noise amplifiers and quantum bits. However, microscopic defects in the oxide tunnel barrier can produce low and high frequency noise which can potentially limit the coherence times and quality fa...

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Published in:arXiv.org 2009-05
Main Authors: Vijay, R, Sau, J D, Cohen, Marvin L, Siddiqi, I
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description Josephson tunnel junctions are widely used as nonlinear elements in superconducting circuits such as low noise amplifiers and quantum bits. However, microscopic defects in the oxide tunnel barrier can produce low and high frequency noise which can potentially limit the coherence times and quality factors of resonant circuits. Weak link Josephson junctions are an attractive alternative provided that sufficient nonlinearity can be engineered. We compute the current phase relation for superconducting weak links, with dimensions comparable to the zero temperature coherence length, connected to two and three dimensional superconducting electrodes. Our results indicate that 50-100 nm long aluminum nanobridges connected with three dimensional banks can be used to construct nonlinear oscillators for bifurcation amplification. We also show that under static current bias, these oscillators have a sufficiently anharmonic energy level structure to form a qubit. Such weak link junctions thus present a practical new route for realizing sensitive quantum circuits.
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subjects Aluminum
Anharmonicity
Bifurcations
Circuits
Coherence length
Energy levels
Josephson junctions
Low noise
Nonlinearity
Oscillators
Quantum theory
Qubits (quantum computing)
Superconductivity
Tunnel junctions
title Optimizing Anharmonicity in Nanoscale Weak Link Josephson Junction Oscillators
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