Dephasing of solid-state qubits at optimal points

被引：131

作者：

Makhlin, Y

Shnirman, A

机构：

[1] Univ Karlsruhe, Inst Theoret Festkorperphys, D-76128 Karlsruhe, Germany

[2] LD Landau Theoret Phys Inst, Moscow 117940, Russia

来源：

PHYSICAL REVIEW LETTERS | 2004年 / 92卷 / 17期

关键词：

D O I：

10.1103/PhysRevLett.92.178301

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Motivated by recent experiments with Josephson-junction circuits, we analyze the influence of various noise sources on the dynamics of two-level systems at optimal operation points where the linear coupling to low-frequency fluctuations is suppressed. We study the decoherence due to nonlinear (quadratic) coupling, focusing on the experimentally relevant 1/f and Ohmic noise power spectra. For 1/f noise strong higher-order effects influence the evolution.

引用

页码：178301 / 1

页数：4

共 20 条

[1] Coherent quantum dynamics of a superconducting flux qubit [J].

Chiorescu, I ;

Nakamura, Y ;

Harmans, CJPM ;

Mooij, JE .

SCIENCE, 2003, 299 (5614) :1869-1871

[2]

Cottet A., 2001, MACROSCOPIC QUANTUM, P111

[3]

GALPERIN YM, CONDMAT0312490

[4]

GELLMANN M, 1957, PHYS REV, V106, P364, DOI 10.1103/PhysRev.106.364

[5]

KAMENEV A, 2002, STRONGLY CORRELATED

[6]

LEVITOV LS, 1997, GREENS FUNCTIONS THE, pCH8

[7] Rabi oscillations in a large Josephson-junction qubit [J].

Martinis, JM ;

Nam, S ;

Aumentado, J ;

Urbina, C .

PHYSICAL REVIEW LETTERS, 2002, 89 (11) :1-117901

[8] Charge echo in a cooper-pair box [J].

Nakamura, Y ;

Pashkin, YA ;

Yamamoto, T ;

Tsai, JS .

PHYSICAL REVIEW LETTERS, 2002, 88 (04) :4

[9] Coherent control of macroscopic quantum states in a single-Cooper-pair box [J].

Nakamura, Y ;

Pashkin, YA ;

Tsai, JS .

NATURE, 1999, 398 (6730) :786-788

[10] Decoherence and 1/f noise in Josephson qubits -: art. no. 228304 [J].

Paladino, E ;

Faoro, L ;

Falci, G ;

Fazio, R .

PHYSICAL REVIEW LETTERS, 2002, 88 (22) :228304/1-228304/4

← 1 2 →