The two Josephson junction flux qubit with large tunneling amplitude

In this paper we discuss solid-state nanoelectronic realizations of Josephson flux qubits with large tunneling amplitude between the two macroscopic states. The latter can be controlled via the height and form of the potential barrier, which is determined by quantum-state engineering of the flux q...

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Published in:	Физика низких температур
Date:	2008
Main Authors:	Shnyrkov, V.I., Soroka, A.A., Melnyk, S.I.
Format:	Article
Language:	English
Published:	Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України 2008
Subjects:	Свеpхпpоводимость, в том числе высокотемпеpатуpная
Online Access:	https://nasplib.isofts.kiev.ua/handle/123456789/117389
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Journal Title:	Digital Library of Periodicals of National Academy of Sciences of Ukraine
Cite this:	The two Josephson junction flux qubit with large tunneling amplitude / V.I. Shnyrkov, A.A. Soroka, S.I. Melnyk // Физика низких температур. — 2008. — Т. 34, № 8. — С. 773–780. — Бібліогр.: 22 назв. — англ.

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Digital Library of Periodicals of National Academy of Sciences of Ukraine

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spelling	Shnyrkov, V.I. Soroka, A.A. Melnyk, S.I. 2017-05-23T10:04:05Z 2017-05-23T10:04:05Z 2008 The two Josephson junction flux qubit with large tunneling amplitude / V.I. Shnyrkov, A.A. Soroka, S.I. Melnyk // Физика низких температур. — 2008. — Т. 34, № 8. — С. 773–780. — Бібліогр.: 22 назв. — англ. 0132-6414 https://nasplib.isofts.kiev.ua/handle/123456789/117389 PACS: 03.75.Lm; 74.50.+r; 85.25.Cp In this paper we discuss solid-state nanoelectronic realizations of Josephson flux qubits with large tunneling amplitude between the two macroscopic states. The latter can be controlled via the height and form of the potential barrier, which is determined by quantum-state engineering of the flux qubit circuit. The simplest circuit of the flux qubit is a superconducting loop interrupted by a Josephson nanoscale tunnel junction. The tunneling amplitude between two macroscopically different states can be essentially increased, by engineering of the qubit circuit, if tunnel junction is replaced by a ScS contact. However, only Josephson tunnel junctions are particularly suitable for large-scale integration circuits and quantum detectors with preset- day technology. To overcome this difficulty we consider here the flux qubit with high-level energy separation between «ground» and «excited» states, which consists of a superconducting loop with two lowcapacitance Josephson tunnel junctions in series. We demonstrate that for real parameters of resonant superposition between the two macroscopic states the tunneling amplitude can reach values greater than 1 K. Analytical results for the tunneling amplitude obtained within semiclassical approximation by instanton technique show good correlation with a numerical solution. We thank W. Krech, D. Born, A.V. Ustinov and S.V. Kuplevakhsky for helpful discussions. The work was supported by the Grant No. M/189-2007 within the «Nanophysics and nanoelectronics» program of the Ministry of Education and Science of Ukraine. en Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України Физика низких температур Свеpхпpоводимость, в том числе высокотемпеpатуpная The two Josephson junction flux qubit with large tunneling amplitude Article published earlier
institution	Digital Library of Periodicals of National Academy of Sciences of Ukraine
collection	DSpace DC
title	The two Josephson junction flux qubit with large tunneling amplitude
spellingShingle	The two Josephson junction flux qubit with large tunneling amplitude Shnyrkov, V.I. Soroka, A.A. Melnyk, S.I. Свеpхпpоводимость, в том числе высокотемпеpатуpная
title_short	The two Josephson junction flux qubit with large tunneling amplitude
title_full	The two Josephson junction flux qubit with large tunneling amplitude
title_fullStr	The two Josephson junction flux qubit with large tunneling amplitude
title_full_unstemmed	The two Josephson junction flux qubit with large tunneling amplitude
title_sort	two josephson junction flux qubit with large tunneling amplitude
author	Shnyrkov, V.I. Soroka, A.A. Melnyk, S.I.
author_facet	Shnyrkov, V.I. Soroka, A.A. Melnyk, S.I.
topic	Свеpхпpоводимость, в том числе высокотемпеpатуpная
topic_facet	Свеpхпpоводимость, в том числе высокотемпеpатуpная
publishDate	2008
language	English
container_title	Физика низких температур
publisher	Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України
format	Article
description	In this paper we discuss solid-state nanoelectronic realizations of Josephson flux qubits with large tunneling amplitude between the two macroscopic states. The latter can be controlled via the height and form of the potential barrier, which is determined by quantum-state engineering of the flux qubit circuit. The simplest circuit of the flux qubit is a superconducting loop interrupted by a Josephson nanoscale tunnel junction. The tunneling amplitude between two macroscopically different states can be essentially increased, by engineering of the qubit circuit, if tunnel junction is replaced by a ScS contact. However, only Josephson tunnel junctions are particularly suitable for large-scale integration circuits and quantum detectors with preset- day technology. To overcome this difficulty we consider here the flux qubit with high-level energy separation between «ground» and «excited» states, which consists of a superconducting loop with two lowcapacitance Josephson tunnel junctions in series. We demonstrate that for real parameters of resonant superposition between the two macroscopic states the tunneling amplitude can reach values greater than 1 K. Analytical results for the tunneling amplitude obtained within semiclassical approximation by instanton technique show good correlation with a numerical solution.
issn	0132-6414
url	https://nasplib.isofts.kiev.ua/handle/123456789/117389
citation_txt	The two Josephson junction flux qubit with large tunneling amplitude / V.I. Shnyrkov, A.A. Soroka, S.I. Melnyk // Физика низких температур. — 2008. — Т. 34, № 8. — С. 773–780. — Бібліогр.: 22 назв. — англ.
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first_indexed	2025-12-07T20:41:52Z
last_indexed	2025-12-07T20:41:52Z
_version_	1850883558928809984

The two Josephson junction flux qubit with large tunneling amplitude

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