Stable, low-error, and calibration-free polarization encoder for free-space quantum communication

被引：25

作者：

Avesani, Marco ^{[1
]}

Agnesi, Costantino ^{[1
]}

Stanco, Andrea ^{[1
]}

Vallone, Giuseppe ^{[1
,2
,3
]}

Villoresi, Paolo ^{[1
,3
]}

机构：

[1] Univ Padua, Dipartimento Ingn Informaz, Via Gradenigo 68, I-35131 Padua, Italy

[2] Univ Padua, Dipartimento Fis & Astron, Via Marzolo 8, I-35131 Padua, Italy

[3] Ist Foton & Nanotecnol CNR, Via Trasea 7, I-35131 Padua, Italy

来源：

OPTICS LETTERS | 2020年 / 45卷 / 17期

关键词：

KEY DISTRIBUTION-SYSTEM; ROBUST;

D O I：

10.1364/OL.396412

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Polarization-encoded free-space quantum communication requires a quantum state source featuring fast modulation, long-term stability, and a low intrinsic error rate. Here we present a polarization encoder that, contrary to previous solutions, generates predetermined polarization states with a fixed reference frame in free-space. The proposed device does not require calibration either at the transmitter or at the receiver and achieves long-term stability. A proof-of-concept experiment is also reported, demonstrating a quantum bit error rate lower than 0.2% for several hours without any active recalibration. (C) 2020 Optical Society of America

引用

页码：4706 / 4709

页数：4

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