DC SQUID based on unshunted Josephson junctions: Experimental results

Heikki Seppä; Mikko Kiviranta; Leif Grönberg

doi:10.1109/77.403284

DC SQUID based on unshunted Josephson junctions: Experimental results

Heikki Seppä, Mikko Kiviranta, Leif Grönberg

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Abstract

It has been proposed that a new SQUID type be constructed by using unshunted Josephson junctions instead of resistively shunted junctions. Using this approach we are able to present a SQUID having a high output dynamic resistance and a device characterized by a negative output resistance and an extremely low noise. The first mentioned is called a high-gain SQUID, the latter an unshunted SQUID. This article describes preliminary experiments obtained from the SQUIDs based on this concept. The iv characteristics are shown to resemble the theoretically predicted characteristics but the noise performance was higher than expected. Most likely the reason for the high noise was the imperfect damping of the SQUID in the frequencies near 1 GHz

Original language	English
Pages (from-to)	3248-3251
Journal	IEEE Transactions on Applied Superconductivity
Volume	5
Issue number	2
DOIs	https://doi.org/10.1109/77.403284
Publication status	Published - 1995
MoE publication type	A1 Journal article-refereed

Keywords

Josephson junction

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10.1109/77.403284

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abstract = "It has been proposed that a new SQUID type be constructed by using unshunted Josephson junctions instead of resistively shunted junctions. Using this approach we are able to present a SQUID having a high output dynamic resistance and a device characterized by a negative output resistance and an extremely low noise. The first mentioned is called a high-gain SQUID, the latter an unshunted SQUID. This article describes preliminary experiments obtained from the SQUIDs based on this concept. The iv characteristics are shown to resemble the theoretically predicted characteristics but the noise performance was higher than expected. Most likely the reason for the high noise was the imperfect damping of the SQUID in the frequencies near 1 GHz",

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author = "Heikki Sepp{\"a} and Mikko Kiviranta and Leif Gr{\"o}nberg",

year = "1995",

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T1 - DC SQUID based on unshunted Josephson junctions

T2 - Experimental results

AU - Seppä, Heikki

AU - Kiviranta, Mikko

AU - Grönberg, Leif

PY - 1995

Y1 - 1995

N2 - It has been proposed that a new SQUID type be constructed by using unshunted Josephson junctions instead of resistively shunted junctions. Using this approach we are able to present a SQUID having a high output dynamic resistance and a device characterized by a negative output resistance and an extremely low noise. The first mentioned is called a high-gain SQUID, the latter an unshunted SQUID. This article describes preliminary experiments obtained from the SQUIDs based on this concept. The iv characteristics are shown to resemble the theoretically predicted characteristics but the noise performance was higher than expected. Most likely the reason for the high noise was the imperfect damping of the SQUID in the frequencies near 1 GHz

AB - It has been proposed that a new SQUID type be constructed by using unshunted Josephson junctions instead of resistively shunted junctions. Using this approach we are able to present a SQUID having a high output dynamic resistance and a device characterized by a negative output resistance and an extremely low noise. The first mentioned is called a high-gain SQUID, the latter an unshunted SQUID. This article describes preliminary experiments obtained from the SQUIDs based on this concept. The iv characteristics are shown to resemble the theoretically predicted characteristics but the noise performance was higher than expected. Most likely the reason for the high noise was the imperfect damping of the SQUID in the frequencies near 1 GHz

KW - Josephson junction

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DO - 10.1109/77.403284

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JO - IEEE Transactions on Applied Superconductivity

JF - IEEE Transactions on Applied Superconductivity

IS - 2

ER -

DC SQUID based on unshunted Josephson junctions: Experimental results

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Keywords

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