The two Josephson junction flux qubit with large tunneling amplitude
Vernadsky National Library of Ukraine
Переглянути архів Інформація| Поле | Співвідношення | |
| Title |
The two Josephson junction flux qubit with large tunneling amplitude
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| Creator |
Shnyrkov, V.I.
Soroka, A.A. Melnyk, S.I. |
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| Subject |
Свеpхпpоводимость, в том числе высокотемпеpатуpная
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| 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. |
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| Date |
2017-05-23T10:04:05Z
2017-05-23T10:04:05Z 2008 |
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| Type |
Article
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| Identifier |
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 http://dspace.nbuv.gov.ua/handle/123456789/117389 PACS: 03.75.Lm; 74.50.+r; 85.25.Cp |
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| Language |
en
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| Relation |
Физика низких температур
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| Publisher |
Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України
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