Strong Coupling and Single-Photon Nonlinearity in Free-Electron Quantum Optics

被引：11

作者：

Karnieli, Aviv ^{[1
]}

Roques-Carmes, Charles ^{[1
]}

Rivera, Nicholas ^{[2
]}

Fan, Shanhui ^{[1
]}

机构：

[1] Stanford Univ, EL Ginzton Labs, Stanford, CA 94305 USA

[2] Harvard Univ, Dept Phys, Cambridge, MA 02138 USA

来源：

ACS PHOTONICS | 2024年 / 11卷 / 08期

关键词：

quantum optics; free electrons; single photonnonlinearity; electron-photon interaction; SUPERCONTINUUM GENERATION; EXCITATIONS; RADIATION; FLAT;

D O I：

10.1021/acsphotonics.4c00908

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

A central challenge in the emerging field of free-electron quantum optics is to achieve strong quantum interaction and single-photon nonlinearity between a flying free electron and a photonic mode. Existing schemes are intrinsically limited by electron diffraction, which puts an upper bound on the interaction length and, therefore, on the strength of quantum coupling and nonlinearity. Here, we propose "free-electron fibers": effectively one-dimensional photonic systems where free electrons copropagate with two guided modes. The first mode applies a ponderomotive trap to the free electron, removing the limitations due to electron diffraction. The second mode strongly couples to the guided free electron with an enhanced coupling that is orders of magnitude larger than previous designs. The extended interaction lengths enabled by our scheme allow for strong single-photon nonlinearities mediated by free electrons. We predict novel quantum effects in our system such as deterministic single-photon emission and nonlinear multimode dynamics. Our proposal paves the way toward the realization of heralded macroscopic nonclassical light generation, deterministic single-photon sources, and quantum gates controlled by free-electron-photon interactions.

引用

页码：3401 / 3411

页数：11

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