Decoherence-free quantum information processing with four-photon entangled states

被引：181

作者：

Bourennane, M ^{[1
]}

Eibl, M

Gaertner, S

Kurtsiefer, C

Cabello, A

Weinfurter, H

机构：

[1] Max Planck Inst Quantum Opt, D-85748 Garching, Germany

[2] Univ Munich, Sekt Phys, D-80797 Munich, Germany

[3] Univ Seville, Dept Fis Aplicada 2, E-41012 Seville, Spain

来源：

PHYSICAL REVIEW LETTERS | 2004年 / 92卷 / 10期

关键词：

D O I：

10.1103/PhysRevLett.92.107901

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Decoherence-free states protect quantum information from collective noise, the predominant cause of decoherence in current implementations of quantum communication and computation. Here we demonstrate that spontaneous parametric down conversion can be used to generate four-photon states which enable the encoding of one qubit in a decoherence-free subspace. The immunity against noise is verified by quantum state tomography of the encoded qubit. We show that particular states of the encoded qubit can be distinguished by local measurements on the four photons only.

引用

页码：107901 / 1

页数：4

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