Superconducting phase qubit based on the Josephson oscillator with strong anharmonicity
Source: Phys. Rev. B 80, 214535 (2010); doi:10.1103/PhysRevB.80.214535
Published 30 December 2009
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Research ToolkitKEYWORDS and PACS
eigenvalues and eigenfunctions,
harmonic oscillators,
Josephson effect,
oscillators,
quantum computing,
SQUIDs
- 03.67.Lx
Quantum computation architectures and implementations - 74.50.+r
Superconductor tunneling phenomena; point contacts, weak links, Josephson effects - 85.25.Dq
Superconducting quantum interference devices (SQUIDs) - 03.67.Pp
Quantum error correction and other methods for protection against decoherence - YEAR: 2009
PUBLICATION DATA
APS
We propose a superconducting phase qubit on the basis of the radio-frequency superconducting quantum interference device with the screening parameter value 
L![[equivalent]](http://scitation.aip.org/stockgif3/equiv.gif)
(2
/
0)LIc![[approximate]](http://scitation.aip.org/stockgif3/ap.gif)
1, biased by a half-flux quantum e=0/2. Significant anharmonicity (>30%) can be achieved in this system due to the interplay of the cosine Josephson potential and the parabolic magnetic energy potential that ultimately leads to the quartic polynomial shape of the well. The two lowest eigenstates in this global minimum perfectly suit for the qubit which is insensitive to the charge variable, biased in the optimal point and allows an efficient dispersive readout. Moreover, the transition frequency in this qubit can be tuned within an appreciable range allowing variable qubit-qubit coupling.
©2009 The American Physical Society
L(2/0)LIc1, biased by a half-flux quantum e=0/2. Significant anharmonicity (>30%) can be achieved in this system due to the interplay of the cosine Josephson potential and the parabolic magnetic energy potential that ultimately leads to the quartic polynomial shape of the well. The two lowest eigenstates in this global minimum perfectly suit for the qubit which is insensitive to the charge variable, biased in the optimal point and allows an efficient dispersive readout. Moreover, the transition frequency in this qubit can be tuned within an appreciable range allowing variable qubit-qubit coupling.
©2009 The American Physical Society
| History: | Received 27 August 2009; revised 19 November 2009; published 30 December 2009 |
| Permalink: |
http://link.aps.org/abstract/PRB/v80/e214535 |
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