Meet the editor

Keyu Xia was awarded his doctoral degree of "Optics" by the Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences in 2007. He has been a full professor at Nanjing University since 2017. His research interest includes quantum optics and quantum information, in particular, chiral quantum optics. He has published more than 40 peer-reviewed publications. His academic achievements include: (I) proposing the first

quantum-state-controlled photon isolator and circulator; (II) proposing a chiral cross-Kerr nonlinear medium to bypass the dynamical reciprocity in nonlinear isolation; (III) experimentally demonstrating the chiral susceptibility-momentum locking as a principle for optical nonreciprocity. Due to his significant contributions to quantum optics and quantum information technology, he was awarded the senior member designation of OSA in 2020.

Contents

Basic Concept

Structured Light?

*by Constantin Meis*

in Nonlinear Processes

Nonreciprocal Control

*by Lei Tang and Keyu Xia*

Generation

*by ChandraSekhar Roychoudhuri*

Quantized Field of Single Photons

*by Zhi-Yuan Zhou and Bao-Sen Shi*

*by Yuanhua Li and Xianfeng Chen*

Optical Chirality and Single-Photon Isolation

**Preface XI**

**Section 1 1**

**Chapter 1 3**

**Chapter 2 15**

**Section 2 37**

**Chapter 3 39**

**Chapter 4 57**

**Section 3 77**

**Chapter 5 79**

Do We Manipulate Photons or Diffractive EM Waves to Generate

Generation and Manipulation of Nonclassical Photon Sources

Single-Photon Frequency Conversion for Quantum Interface

## Contents


Preface

This short book provides readers with some basic concepts of single photons and the latest developments in the field. The book reviews the most important method of generating single photons in experiments and it also introduces an emerging field of

The first section provides a very simple picture of the concept of evolution of the photon" from the classical to the quantum formalisms, and the quantization of the light field as a description of the photon. The next section focuses on recent experiments exploiting optical nonlinear processes to generate and manipulate single photons. In the last section, nonreciprocal quantum devices are designed to isolate

The book aims to present some basic knowledge of single photons to readers in a

**Keyu Xia** Professor,

Nanjing University, Jiangsu, China

single-photon isolation.

the backscattering of single photons.

quick read but with not many details.
