Entangling Quantum-Logic Gate Operated with an Ultrabright Semiconductor Single-Photon Source

被引：44

作者：

Gazzano, O. ^{[1
]}

Almeida, M. P. ^{[2
,3
]}

Nowak, A. K. ^{[1
]}

Portalupi, S. L. ^{[1
]}

Lemaitre, A. ^{[1
]}

Sagnes, I. ^{[1
]}

White, A. G. ^{[2
,3
]}

Senellart, P. ^{[1
]}

机构：

[1] CNRS, Lab Photon & Nanostruct, UPR20, F-91460 Marcoussis, France

[2] Univ Queensland, Sch Math & Phys, Ctr Engn Quantum Syst, Brisbane, Qld 4072, Australia

[3] Univ Queensland, Sch Math & Phys, Ctr Quantum Comp & Commun Technol, Brisbane, Qld 4072, Australia

来源：

PHYSICAL REVIEW LETTERS | 2013年 / 110卷 / 25期

基金：

澳大利亚研究理事会; 欧洲研究理事会;

关键词：

DEVICE; DOT;

D O I：

10.1103/PhysRevLett.110.250501

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We demonstrate the unambiguous entangling operation of a photonic quantum-logic gate driven by an ultrabright solid-state single-photon source. Indistinguishable single photons emitted by a single semiconductor quantum dot in a micropillar optical cavity are used as target and control qubits. For a source brightness of 0.56 photons per pulse, the measured truth table has an overlap with the ideal case of 68.4 +/- 0.5%, increasing to 73.0 +/- 1.6% for a source brightness of 0.17 photons per pulse. The gate is entangling: At a source brightness of 0.48, the Bell-state fidelity is above the entangling threshold of 50% and reaches 71.0 +/- 3.6% for a source brightness of 0.15.

引用

页数：5

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