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Article overview
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Direct current superconducting quantum interferometers with asymmetric shunt resistors | | M. Rudolph
; J. Nagel
; J.M. Meckbach
; M. Kemmler
; M. Siegel
; K. Ilin
; D. Koelle
; R. Kleiner
; | | Date: |
30 Jun 2012 | | Abstract: | We have investigated asymmetrically shunted Nb/Al-AlO$_x$/Nb direct current
(dc) superconducting quantum interference devices (SQUIDs). While keeping the
total 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 can
be 3--4 times better than that of its symmetric counterpart. Experiments at a
temperature of 4.2,K yielded $epsilon approx 32,hbar$ for an asymmetric
SQUID with an inductance of $22,
m{pH}$. For a comparable symmetric device
$epsilon = 110,hbar$ was achieved, confirming our simulation results. | | Source: | arXiv, 1207.0082 | | Services: | Forum | Review | PDF | Favorites | |
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