The initial decoherence of the mesoscopic Josephson junction flux qubit

被引：2

作者：

Su Jie ^{[1
]}

Wang Ji-Suo ^{[1
]}

Zhang Xiao-Yan ^{[1
]}

Liang Bao-Long ^{[1
]}

机构：

[1] Liaocheng Univ, Sch Phys Sci & Informat Engn, Liaocheng 252059, Peoples R China

来源：

CHINESE PHYSICS B | 2010年 / 19卷 / 05期

基金：

中国国家自然科学基金;

关键词：

mesoscopic rfSQUID; flux qubit; short-time decoherence; QUANTUM-SYSTEMS; QUANTIZATION; NOISE;

D O I：

10.1088/1674-1056/19/5/057301

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

For a mesoscopic radio frequency superconducting quantum interference device (rfSQUID), at a degeneracy point, the system reduces to a quantum two-state system which can be used as a flux qubit. When the noise environment is equivalent to a harmonic oscillators bath, by virtue of an operator-norm measure for the short time decoherence, this paper investigates the initial decoherence of the flux qubit operating in the ohmic noise environment and illustrates its property by means of the numerical evaluation.

引用

页码：0573011 / 0573015

页数：5

共 17 条

[1] Dephasing of a superconducting qubit induced by photon noise [J].

Bertet, P ;

Chiorescu, I ;

Burkard, G ;

Semba, K ;

Harmans, CJPM ;

DiVincenzo, DP ;

Mooij, JE .

PHYSICAL REVIEW LETTERS, 2005, 95 (25)

[2] Phase coherent dynamics of a superconducting flux qubit with capacitive bias readout [J].

Deppe, F. ;

Mariantoni, M. ;

Menzel, E. P. ;

Saito, S. ;

Kakuyanagi, K. ;

Tanaka, H. ;

Meno, T. ;

Semba, K. ;

Takayanagi, H. ;

Gross, R. .

PHYSICAL REVIEW B, 2007, 76 (21)

[3]

DiVincenzo D. P., ARXIVQUANTPH0002077V

[4] Additivity of decoherence measures for multiqubit quantum systems [J].

Fedichkin, L ;

Fedorov, A ;

Privman, V .

PHYSICS LETTERS A, 2004, 328 (2-3) :87-93

[5] Measures of decoherence [J].

Fedichkin, L ;

Fedorov, A ;

Privman, V .

QUANTUM INFORMATION AND COMPUTATION, 2003, 5105 :243-254

[6]

HARLINGEN DJV, 2004, PHYS REV B, V7

[7] Cooper-pair number-phase quantization analysis in double-Josephson-junction mesoscopic circuit coupled by a capacitor [J].

Liang Bao-Long ;

Wang Ji-Suo ;

Fan Hong-Yi .

CHINESE PHYSICS B, 2008, 17 (02) :697-701

[8]

Liang BL, 2007, CHINESE PHYS, V16, P3097, DOI 10.1088/1009-1963/16/10/046

[9] Short-time decoherence of Josephson charge qubit nonlinearly coupling with its environment [J].

Liang, XT ;

Xiong, YJ .

PHYSICS LETTERS A, 2004, 332 (1-2) :8-16

[10] Quantum-state engineering with Josephson-junction devices [J].

Makhlin, Y ;

Schön, G ;

Shnirman, A .

REVIEWS OF MODERN PHYSICS, 2001, 73 (02) :357-400

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