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

[11] Decoherence in Josephson qubits from dielectric loss [J].

Martinis, JM ;

Cooper, KB ;

McDermott, R ;

Steffen, M ;

Ansmann, M ;

Osborn, KD ;

Cicak, K ;

Oh, S ;

Pappas, DP ;

Simmonds, RW ;

Yu, CC .

PHYSICAL REVIEW LETTERS, 2005, 95 (21)

[12] Decoherence of a superconducting qubit due to bias noise [J].

Martinis, JM ;

Nam, S ;

Aumentado, J ;

Lang, KM ;

Urbina, C .

PHYSICAL REVIEW B, 2003, 67 (09)

[13] Initial decoherence of open quantum systems [J].

Privman, V .

JOURNAL OF STATISTICAL PHYSICS, 2003, 110 (3-6) :957-970

[14] Noise and decoherence in quantum two-level systems [J].

Shnirman, A ;

Makhlin, Y ;

Schön, G .

PHYSICA SCRIPTA, 2002, T102 :147-154

[15] Modified josephson rquation for mesoscopic parallel lC circuit including a josephson junction [J].

Su, Jie ;

Wang, Ji-Suo ;

Liang, Bao-Long ;

Zhang, Xiao-Yan .

Chinese Physics Letters, 2009, 26 (01)

[16] Short-time decoherence for general system-environment interactions [J].

Tolkunov, D ;

Privman, V .

PHYSICAL REVIEW A, 2004, 69 (06) :062309-1

[17] Decoherence of flux qubits due to 1/f flux noise [J].

Yoshihara, F. ;

Harrabi, K. ;

Niskanen, A. O. ;

Nakamura, Y. ;

Tsai, J. S. .

PHYSICAL REVIEW LETTERS, 2006, 97 (16)

← 1 2 →