Implementation of a Nondeterministic Optical Noiseless Amplifier

被引：186

作者：

Ferreyrol, Franck ^{[1
]}

Barbieri, Marco ^{[1
]}

Blandino, Remi ^{[1
]}

Fossier, Simon ^{[1
]}

Tualle-Brouri, Rosa ^{[1
]}

Grangier, Philippe ^{[1
]}

机构：

[1] Univ Paris 11, CNRS, Grp Opt Quant, Lab Charles Fabry,Inst Opt, F-91127 Palaiseau, France

来源：

PHYSICAL REVIEW LETTERS | 2010年 / 104卷 / 12期

关键词：

QUANTUM-NONDEMOLITION MEASUREMENTS; PODOLSKY-ROSEN CHANNELS; COHERENT STATES; TELEPORTATION; CLONING; PHOTON;

D O I：

10.1103/PhysRevLett.104.123603

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Quantum mechanics imposes that any amplifier that works independently on the phase of the input signal has to introduce some excess noise. The impossibility of such a noiseless amplifier is rooted in the unitarity and linearity of quantum evolution. A possible way to circumvent this limitation is to interrupt such evolution via a measurement, providing a random outcome able to herald a successful-and noiseless-amplification event. Here we show a successful realization of such an approach; we perform a full characterization of an amplified coherent state using quantum homodyne tomography, and observe a strong heralded amplification, with about a 6 dB gain and a noise level significantly smaller than the minimal allowed for any ordinary phase-independent device.

引用

页数：4

共 31 条

[1] Unconditional quantum cloning of coherent states with linear optics [J].