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 engineeri...
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| Veröffentlicht in: | Физика низких температур |
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| Datum: | 2008 |
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Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України
2008
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| Назва журналу: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Zitieren: | 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| _version_ | 1862745671954595840 |
|---|---|
| author | Shnyrkov, V.I. Soroka, A.A. Melnyk, S.I. |
| author_facet | Shnyrkov, V.I. Soroka, A.A. Melnyk, S.I. |
| 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. |
| collection | DSpace DC |
| container_title | Физика низких температур |
| 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.
|
| first_indexed | 2025-12-07T20:41:52Z |
| format | Article |
| fulltext | |
| id | nasplib_isofts_kiev_ua-123456789-117389 |
| institution | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| issn | 0132-6414 |
| language | English |
| last_indexed | 2025-12-07T20:41:52Z |
| publishDate | 2008 |
| publisher | Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України |
| record_format | dspace |
| 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 |
| 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 | 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_short | The two Josephson junction flux qubit with large tunneling amplitude |
| title_sort | two josephson junction flux qubit with large tunneling amplitude |
| topic | Свеpхпpоводимость, в том числе высокотемпеpатуpная |
| topic_facet | Свеpхпpоводимость, в том числе высокотемпеpатуpная |
| url | https://nasplib.isofts.kiev.ua/handle/123456789/117389 |
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