English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

We have investigated asymmetrically shunted Nb/Al-AlO$_x$/Nb direct current(dc) superconducting quantum interference devices (SQUIDs). While keeping thetotal resistance $R$ identical to a comparable symmetric SQUID with $R^{-1} =R_1^{-1} + R_2^{-1}$, we shunted only one of the two Josephson junctions with$R = R_{1,2}/2$. Simulations predict that the optimum energy resolution$\epsilon$ and thus also the noise performance of such an asymmetric SQUID canbe 3--4 times better than that of its symmetric counterpart. Experiments at atemperature of 4.2\,K yielded $\epsilon \approx 32\,\hbar$ for an asymmetricSQUID with an inductance of $22\,\rm{pH}$. For a comparable symmetric device$\epsilon = 110\,\hbar$ was achieved, confirming our simulation results.

Direct current superconducting quantum interferometers with asymmetric shunt resistors