Demultiplexer of Multi-Order Correlation Interference in Nitrogen Vacancy Center Diamond.

Xinghua Li,Jinhao Wang,Luyuan Wang,Jinnan Wang,Yufeng Li,Yuan Zhao,Hasnain Ali,Faizan Raza,Yanpeng Zhang

doi:10.3390/ma14226745

Abstract

We reported the second- and third-order temporal interference of two non-degenerate pseudo-thermal sources in a nitrogen-vacancy center (NV−). The relationship between the indistinguishability of source and path alternatives is analyzed at low temperature. In this article, we demonstrate the switching between three-mode bunching and frequency beating effect controlled by the time offset and the frequency difference to realize optical demultiplexer. Our experimental results suggest the advanced technique achieves channel spacing and speed of the demultiplexer of about 96% and 17 ns, respectively. The proposed demultiplexer model will have potential applications in quantum computing and communication.

Highlights

From Feynman’s point of view, interference is at the heart of quantum physics, and contains the only mystery of quantum physics [1]
We investigate the interference in intensity–noise correlation by treating multi-order fluorescence generated from a negatively charged nitrogen-vacancy (NV− )
The results proposed for optical demultiplexer are based on the channel spacing and switching speed obtained from correlation and can be controlled by the time offset and frequency of incident beam

Summary

Introduction

From Feynman’s point of view, interference is at the heart of quantum physics, and contains the only mystery of quantum physics [1]. Interference between different photons never occurs [2]. In the case of the generation of paired photons, a similar statement can be made for interference of two photons, in which superposition comes from the pair of photons jointly measured (analogous definition of Dirac) sharing the same energy level, such as in multi-wave mixing [3,4,5]. Paul considered Dirac’s statement to be limited to first-order coherence [6]. In [7,8], the second-order temporal and spatial coherence from two independent sources (coherent, pseudo thermal, and laser-photon, among others) is extensively studied using the “Hong-Ou-Mandel (HOM) dip” or “Shih-Alley dip” interference phenomenon [9,10,11]

Methods

Results

Conclusion