The energy level splitting for Unharmonic dc SQUID to be used as phase Q-bit

Nicolai V. Klenov; Victor K. Kornev; Niels Falsig Pedersen

doi:10.1016/j.physc.2006.01.027

The energy level splitting for Unharmonic dc SQUID to be used as phase Q-bit

Nicolai V. Klenov, Victor K. Kornev, Niels Falsig Pedersen

Research output: Contribution to journal › Journal article › Research › peer-review

Abstract

Dc-SQUID with Josephson junctions characterized by nonsinusoidal current-phase relation is being considered as a basis for phase qubit. It has been shown that the second and third harmonic components each in the current-phase relation are able to provide double-well potential and the energy level splitting. Threshold condition for the double-well form origin has been determined taking into account the impact of both harmonics. The splitting gap of the ground energy level has been calculated as a function of the harmonic amplitudes for different ratio s of characteristic Josephson energy E-C to the Coulomb energy E-Q0. It has been shown that the gap value comes to about 7E(Q0) with increase of the ratio s. No external field needed, no bias current required and no circular currents are major advantages of such a qubit. (c) 2006 Elsevier B.V. All rights reserved.

Original language	English
Journal	Physica C: Superconductivity and its Applications
Volume	435
Issue number	1-2
Pages (from-to)	114-117
ISSN	0921-4534
DOIs	https://doi.org/10.1016/j.physc.2006.01.027
Publication status	Published - 2006

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title = "The energy level splitting for Unharmonic dc SQUID to be used as phase Q-bit",

abstract = "Dc-SQUID with Josephson junctions characterized by nonsinusoidal current-phase relation is being considered as a basis for phase qubit. It has been shown that the second and third harmonic components each in the current-phase relation are able to provide double-well potential and the energy level splitting. Threshold condition for the double-well form origin has been determined taking into account the impact of both harmonics. The splitting gap of the ground energy level has been calculated as a function of the harmonic amplitudes for different ratio s of characteristic Josephson energy E-C to the Coulomb energy E-Q0. It has been shown that the gap value comes to about 7E(Q0) with increase of the ratio s. No external field needed, no bias current required and no circular currents are major advantages of such a qubit. (c) 2006 Elsevier B.V. All rights reserved. ",

author = "Klenov, {Nicolai V.} and Kornev, {Victor K.} and Pedersen, {Niels Falsig}",

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doi = "10.1016/j.physc.2006.01.027",

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T1 - The energy level splitting for Unharmonic dc SQUID to be used as phase Q-bit

AU - Klenov, Nicolai V.

AU - Kornev, Victor K.

AU - Pedersen, Niels Falsig

PY - 2006

Y1 - 2006

N2 - Dc-SQUID with Josephson junctions characterized by nonsinusoidal current-phase relation is being considered as a basis for phase qubit. It has been shown that the second and third harmonic components each in the current-phase relation are able to provide double-well potential and the energy level splitting. Threshold condition for the double-well form origin has been determined taking into account the impact of both harmonics. The splitting gap of the ground energy level has been calculated as a function of the harmonic amplitudes for different ratio s of characteristic Josephson energy E-C to the Coulomb energy E-Q0. It has been shown that the gap value comes to about 7E(Q0) with increase of the ratio s. No external field needed, no bias current required and no circular currents are major advantages of such a qubit. (c) 2006 Elsevier B.V. All rights reserved.

AB - Dc-SQUID with Josephson junctions characterized by nonsinusoidal current-phase relation is being considered as a basis for phase qubit. It has been shown that the second and third harmonic components each in the current-phase relation are able to provide double-well potential and the energy level splitting. Threshold condition for the double-well form origin has been determined taking into account the impact of both harmonics. The splitting gap of the ground energy level has been calculated as a function of the harmonic amplitudes for different ratio s of characteristic Josephson energy E-C to the Coulomb energy E-Q0. It has been shown that the gap value comes to about 7E(Q0) with increase of the ratio s. No external field needed, no bias current required and no circular currents are major advantages of such a qubit. (c) 2006 Elsevier B.V. All rights reserved.

U2 - 10.1016/j.physc.2006.01.027

DO - 10.1016/j.physc.2006.01.027

M3 - Journal article

SN - 0921-4534

VL - 435

SP - 114

EP - 117

JO - Physica C: Superconductivity and its Applications

JF - Physica C: Superconductivity and its Applications

IS - 1-2

ER -

The energy level splitting for Unharmonic dc SQUID to be used as phase Q-bit

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