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Atom Waveguides

V. I. Balykin

Advances in atomic, molecular, and optical physicsJan 1, 199931 citations

Single‐Excitation Scattering With Waveguide QED in A Cavity‐Trapping‐Two‐Atoms System

Qing‐Lin Liu, Xiaoyu Huang, Zhipeng Cheng +6 more

ABSTRACT We propose a scheme for the single‐photon routing in a hybrid system composed of the cavity‐trapping‐two‐atoms system (CTAS) coupled to two one‐dimensional coupled‐resonator waveguides. By employing the discrete‐coordinate scattering method, exact analytical expressions for the single‐photon scattering amplitudes at the four ports are derived. The results demonstrate that the single‐photon routing characteristics depend not only on the coupling positions, coupling strengths, and local coupling phases between the CTAS and the waveguides, but also critically on the eigenstate structure of the CTAS. Further analysis reveals a clear correspondence between the single‐photon scattering spectrum and the eigenstates of the CTAS, which allows for the classification of the eigenstates involved in cross‐waveguide transport as bright and dark states. By tuning the local coupling phases, coherent enhancement of a specific bright state can be achieved, enabling deterministic single‐photon directional routing. Our work provides a theoretical reference for studies of single‐photon routing in cavity quantum electrodynamics and superconducting circuit platforms.ABSTRACT We propose a scheme for the single‐photon routing in a hybrid system composed of the cavity‐trapping‐two‐atoms system (CTAS) coupled to two one‐dimensional coupled‐resonator waveguides. By employing the discrete‐coordinate scattering method, exact analytical expressions for the single‐photon scattering amplitudes at the four ports are derived. The results demonstrate that the single‐photon routing characteristics depend not only on the coupling positions, coupling strengths, and local coupling phases between the CTAS and the waveguides, but also critically on the eigenstate structure of the CTAS. Further analysis reveals a clear correspondence between the single‐photon scattering spectrum and the eigenstates of the CTAS, which allows for the classification of the eigenstates involved in cross‐waveguide transport as bright and dark states. By tuning the local coupling phases, coherent enhancement of a specific bright state can be achieved, enabling deterministic single‐photon directional routing. Our work provides a theoretical reference for studies of single‐photon routing in cavity quantum electrodynamics and superconducting circuit platforms.

Advanced Quantum TechnologiesJun 1, 20260 citations

Single photon transport in two waveguides chirally coupled by a quantum emitter

Mu-Tian Cheng, Xiao-San Ma, Jiayan Zhang +1 more

We investigate single photon transport in two waveguides coupled to a two-level quantum emitter (QE). With the deduced analytical scattering amplitudes, we show that under condition of the chiral coupling between the QE and the photon in the two waveguides, the QE can play the role of ideal quantum router to redirect a single photon incident from one waveguide into the other waveguide with a probability of 100% in the ideal condition. The influences of cross coupling between two waveguides and dissipations on the routing are also shown.We investigate single photon transport in two waveguides coupled to a two-level quantum emitter (QE). With the deduced analytical scattering amplitudes, we show that under condition of the chiral coupling between the QE and the photon in the two waveguides, the QE can play the role of ideal quantum router to redirect a single photon incident from one waveguide into the other waveguide with a probability of 100% in the ideal condition. The influences of cross coupling between two waveguides and dissipations on the routing are also shown.

Optics ExpressAug 19, 201662 citations

Atom chip and quantum optics

Shengwang Du

Jan 1, 20060 citations

Transporting Cold Atoms towards a GaN-on-Sapphire Chip via an Optical Conveyor Belt

Lei Xu, L. P. Wang, Guang-Jie Chen +8 more

Trapped atoms on photonic structures inspire many novel quantum devices for quantum information processing and quantum sensing. Here, we demonstrate a hybrid photonic-atom chip platform based on a GaN-on-sapphire chip and the transport of an ensemble of atoms from free space towards the chip with an optical conveyor belts. Due to our platform’s complete optical accessibility and careful control of atomic motion near the chip with a conveyor belt, successful atomic transport towards the chip is made possible. The maximum transport efficiency of atoms is about 50% with a transport distance of 500 μm. Our results open up a new route toward the efficient loading of cold atoms into the evanescent-field trap formed by the photonic integrated circuits, which promises strong and controllable interactions between single atoms and single photons.Trapped atoms on photonic structures inspire many novel quantum devices for quantum information processing and quantum sensing. Here, we demonstrate a hybrid photonic-atom chip platform based on a GaN-on-sapphire chip and the transport of an ensemble of atoms from free space towards the chip with an optical conveyor belts. Due to our platform’s complete optical accessibility and careful control of atomic motion near the chip with a conveyor belt, successful atomic transport towards the chip is made possible. The maximum transport efficiency of atoms is about 50% with a transport distance of 500 μm. Our results open up a new route toward the efficient loading of cold atoms into the evanescent-field trap formed by the photonic integrated circuits, which promises strong and controllable interactions between single atoms and single photons.

arXiv:2305.07900Chinese Physics LettersJul 26, 202314 citations

Quantum transport in an electron waveguide

A. M. Chang, Gregory L. Timp

Jan 1, 19870 citations

Atom transporting and routing by crossed waveguides on a chip

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