DC SQUID based on unshunted Josephson junctions

Experimental results

Research output: Contribution to journalArticleScientificpeer-review

12 Citations (Scopus)

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 languageEnglish
Pages (from-to)3248-3251
JournalIEEE Transactions on Applied Superconductivity
Volume5
Issue number2
DOIs
Publication statusPublished - 1995
MoE publication typeA1 Journal article-refereed

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SQUIDs
Josephson junctions
direct current
output
high gain
low noise
damping
Damping
Experiments

Keywords

  • Josephson junction

Cite this

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title = "DC SQUID based on unshunted Josephson junctions: Experimental results",
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",
keywords = "Josephson junction",
author = "Heikki Sepp{\"a} and Mikko Kiviranta and Leif Gr{\"o}nberg",
year = "1995",
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DC SQUID based on unshunted Josephson junctions : Experimental results. / Seppä, Heikki; Kiviranta, Mikko; Grönberg, Leif.

In: IEEE Transactions on Applied Superconductivity, Vol. 5, No. 2, 1995, p. 3248-3251.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

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

U2 - 10.1109/77.403284

DO - 10.1109/77.403284

M3 - Article

VL - 5

SP - 3248

EP - 3251

JO - IEEE Transactions on Applied Superconductivity

JF - IEEE Transactions on Applied Superconductivity

SN - 1051-8223

IS - 2

ER -