Protecting two-qubit quantum states by π-phase pulses

被引：7

作者：

Hu, Jia-Zhong ^{[1
]}

Wang, Xiang-Bin

Kwek, Leong Chuan ^{[2
,3
,4
]}

机构：

[1] Tsinghua Univ, Minist Educ, Dept Phys, Beijing 100084, Peoples R China

[2] Natl Univ Singapore, Ctr Quantum Technol, Singapore 117542, Singapore

[3] Nanyang Technol Univ, Natl Inst Educ, Singapore 637616, Singapore

[4] Nanyang Technol Univ, Inst Adv Studies, Singapore 637616, Singapore

来源：

PHYSICAL REVIEW A | 2010年 / 82卷 / 06期

基金：

中国国家自然科学基金; 新加坡国家研究基金会;

关键词：

DECOHERENCE;

D O I：

10.1103/PhysRevA.82.062317

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We study the state decay of two qubits interacting with a common harmonic oscillator reservoir. We find both a decoherence error and the error caused by the amplitude change of the superradiant state. We show that frequent pi-phase pulses can eliminate both types of errors and therefore protect a two-qubit odd-parity state more effectively than the frequent measurement method. This shows that the methods using dynamical decoupling and the quantum Zeno effects actually can give rather different results when the operation frequency is finite.

引用

页数：5

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