Article
Chemistry, Analytical
Hong Li, Ming Liu, Feng Yang, Siqi Zhang, Shengping Ruan
Summary: In recent years, cavity optomechanical systems have received extensive attention and research. Photon manipulation is a key task in quantum information science and technology, and photon blockade is an important way to realize single photon sources. This paper studies the phase-controlled tunable unconventional photon blockade in a single-atom-cavity system, and shows that quantum interference of two-photon excitation can cause a photon blockade effect. The influence of squeezed light and phase on the photon blockade effect is also explored.
Article
Physics, Multidisciplinary
Zhong Ding, Yong Zhang
Summary: In this study, we investigate the single-photon blockade, two-photon blockade, and photon-induced tunneling effects in a cavity-atom optomechanical system. We find that a high-quality and efficient single-photon source can be generated with a perfect single-photon blockade, but photon-induced tunneling often occurs in cases of two-photon blockade. Furthermore, we discover the existence of a two-photon blockade region in the optomechanical system.
Article
Optics
Xiuwen Xia, Xinqin Zhang, Jingping Xu, Haozhen Li, Zeyun Fu, Yaping Yang
Summary: Inspired by unconventional photon blockade, a cavity-driven quantum electrodynamics model with a single two-level atom in an asymmetrical Fabry-Perot cavity is proposed. By adjusting the atom-cavity coupling strength and driving direction, output photons can exhibit either bunching or antibunching behavior, leading to the concept of nonreciprocal UCPB (NUCPB) with giant quantum nonreciprocity potentially achievable under specific conditions.
Article
Chemistry, Multidisciplinary
Yuqing Huang, Rui Su, Yubin Wang, Chao Zhu, Jiangang Feng, Jiaxin Zhao, Zheng Liu, Qihua Xiong
Summary: The cavity-photon interface effectively suppresses the temperature-activated spectral diffusion of perovskite nanocrystals, achieving highly stable single-photon emission. This study sheds light on the nature of spectral diffusion in perovskite nanocrystals and provides a method to control single-photon emission.
Article
Optics
Miaodi Guo
Summary: The proposed scheme controls coherent photon absorption through electromagnetically induced transparency in a three-level atom-cavity system. Coherent perfect absorption occurs with the time-reversed symmetry of the lasing process and destructive interference at the cavity interfaces. The frequency range of CPA depends on the decay rates of the cavity mirrors, with wider frequency range for smaller decay rates.
Article
Physics, Applied
Ramachandrarao Yalla, K. Muhammed Shafi, Kali P. Nayak, Kohzo Hakuta
Summary: In this study, we demonstrate the creation of a one-sided cavity on an optical nanofiber using a composite method. The one-sided composite cavity is designed to enhance channeling efficiency and its coupling characteristics are validated through numerical simulations and experiments.
APPLIED PHYSICS LETTERS
(2022)
Article
Optics
Xin Wang, Pengfei Zhang, Gang Li, Tiancai Zhang
Summary: A scheme is proposed to enhance the coupling efficiency of photons from a single quantum emitter into a hole-tailored nanofiber, achieving a coupling efficiency of 62.8% and broad application prospects.
Article
Physics, Multidisciplinary
Xu-Jie Wang, Sheng-Jun Yang, Peng-Fei Sun, Bo Jing, Jun Li, Ming-Ti Zhou, Xiao-Hui Bao, Jian-Wei Pan
Summary: Researchers achieved high-efficiency and long-lifetime entanglement between an atomic ensemble and a single photon through dual control modes and a three-dimensional optical lattice, and successfully verified the entanglement by testing the Bell inequality after 1 second of storage.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Multidisciplinary
Yu-Wei Lu, Jing-Feng Liu, Zeyang Liao, Xue-Hua Wang
Summary: The generation and manipulation of single photons are crucial in quantum technologies, with resonantly coupled plasmonic-photonic cavities showing significant improvement in efficiency and unveiling novel light-matter interaction mechanisms.
SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
(2021)
Article
Optics
I. A. Ivanov, Kyung Taec Kim
Summary: This study presents the results of relativistic calculations on even-order harmonic generation from different atomic targets. The even-order harmonics are generated due to relativistic nondipole effects. By using an approach based on the solution of the time-dependent Dirac equation, the relativistic effects are taken into account. The spectra of the nondipole even harmonics are qualitatively similar to the spectra of the dipole harmonics obeying the same classical cutoff rule. However, the temporal dynamics of the formation of the nondipole harmonics are distinctly different from the process of dipole harmonics formation. The emission of even-order harmonics is strongly suppressed at the beginning of the laser pulse, and the emission times of the nondipole harmonics are shifted with respect to the bursts of the dipole emission. These features can be partly explained by a simple modification of the classical three-step model that considers the selection rules governing the emission of harmonic photons.
Article
Optics
Lucas Ostrowski, Scott Parkins, Morito Shirane, Mark Sadgrove
Summary: The coupling between quantum emitters and evanescent fields allows directional emission into nanophotonic devices, which is crucial for quantum networks. This study demonstrates that a two-level emitter with a randomly polarized dipole moment can emit directionally into a circulating cavity when chirally coupled to a separate emitter in the same cavity. This finding provides a new approach for directional emission in photonic devices.
Article
Physics, Multidisciplinary
Anushree Dey, Arpita Pal, Subhasish Dutta Gupta, Bimalendu Deb
Summary: We theoretically demonstrate the feasibility of generating correlated entangled photon pairs with no threshold in a bimodal cavity setup. This setup utilizes a V-type three level atom, pumped by dual incoherent sources and driven by two coherent fields. We show that the photon pairs are only entangled when the incoherent pumps are at low levels and that the coherent drives are responsible for their generation. Additionally, our results indicate that the dual incoherent pumping without coherent drive can result in amplification of the cavity fields with strong inter-mode antibunching but no entanglement.
Article
Quantum Science & Technology
Guo-An Yan, Dong-shan He, Hua Lu
Summary: This study theoretically investigates the single-photon scattering properties in a one-dimensional waveguide coupled to a cavity and a two-level atom. Two cases are considered: when the waveguide is coupled to the cavity-emitter and when it is coupled to both a cavity and a two-level atom. In our system, the phase of the emitter-cavity-waveguide coupling strength acts as a sensitive controller, allowing for control of perfect transmission, perfect reflection, and adjustment of transmission spectrum.
QUANTUM INFORMATION PROCESSING
(2023)
Article
Optics
Q. Y. Cai, W. Z. Jia
Summary: The research investigates the single-photon scattering spectra of a giant atom coupled to a one-dimensional waveguide, exploring the influence of nondipole effects under both Markovian and non-Markovian conditions. Different line shapes are characterized, with Lorentzian shapes in the Markovian regime and non-Lorentzian shapes with multiple side peaks and total transmission points in the non-Markovian regime. Additionally, a broad photonic band gap can be generated by a single giant atom in the non-Markovian regime.
Article
Optics
Tiantian Shi, Jianxiang Miao, Jia Zhang, Jingbiao Chen
Summary: The exact expressions of finesse and full width at half maximum (FWHM) of Fabry-Perot (FP) resonators are derived, solving the breakdown problem at ultralow reflectivity. The results demonstrate that the FWHM approaches half of the free spectral range and the finesse approaches 2 when the cavity-mirror reflectivity is zero. The expressions have practical applications in bad-cavity lasers and reflection distribution analysis.
