Quantum Optics|100 Article(s)
Interference of quantum beats in Hong–Ou–Mandel interferometry
Jing Qiu, Jun-Heng Shi, Yong-Sheng Zhang, Shen-Sheng Han, and You-Zhen Gui
Photonics Research
  • Publication Date: Apr. 10, 2015
  • Vol. 3, Issue 3, 03000082 (2015)
Auxiliary-cavity-assisted vacuum Rabi splitting of a semiconductor quantum dot in a photonic crystal nanocavity
Hua-Jun Chen
The coherent light-matter interaction has drawn an enormous amount of attention for its fundamental importance in the cavity quantum-electrodynamics (C-QED) field and great potential in quantum information applications. Here, we design a hybrid C-QED system consisting of a quantum dot (QD) driven by two-tone fields implanted in a photonic crystal (PhC) cavity coupled to an auxiliary cavity with a single-mode waveguide and investigate the hybrid system operating in the weak, intermediate, and strong coupling regimes of the light-matter interaction via comparing the QD-photon interaction with the dipole decay rate and the cavity field decay rate. The results indicate that the auxiliary cavity plays a key role in the hybrid system, which affords a quantum channel to influence the absorption of the probe field. By controlling the coupling strength between the auxiliary cavity and the PhC cavity, the phenomenon of the Mollow triplet can appear in the intermediate coupling regime, and even in the weak coupling regime. We further study the strong coupling interaction manifested by vacuum Rabi splitting in the absorption with manipulating the cavity-cavity coupling under different parameter regimes. This study provides a promising platform for understanding the dynamics of QD-C-QED systems and paving the way toward on-chip QD-based nanophotonic devices.
Photonics Research
  • Publication Date: Nov. 30, 2018
  • Vol. 6, Issue 12, 12001171 (2018)
Optical trapping of single quantum dots for cavity quantum electrodynamics
Pengfei Zhang, Gang Song, and Li Yu
We report here a nanostructure that traps single quantum dots for studying strong cavity-emitter coupling. The nanostructure is designed with two elliptical holes in a thin silver patch and a slot that connects the holes. This structure has two functionalities: (1) tweezers for optical trapping; (2) a plasmonic resonant cavity for quantum electrodynamics. The electromagnetic response of the cavity is calculated by finite-difference time-domain (FDTD) simulations, and the optical force is characterized based on the Maxwell’s stress tensor method. To be tweezers, this structure tends to trap quantum dots at the edges of its tips where light is significantly confined. To be a plasmonic cavity, its plasmonic resonant mode interacts strongly with the trapped quantum dots due to the enhanced electric field. Rabi splitting and anti-crossing phenomena are observed in the calculated scattering spectra, demonstrating that a strong-coupling regime has been achieved. The method present here provides a robust way to position a single quantum dot in a nanocavity for investigating cavity quantum electrodynamics.
Photonics Research
  • Publication Date: Feb. 27, 2018
  • Vol. 6, Issue 3, 03000182 (2018)
Entanglement and nonlocality in a coupled-cavity system|On the Cover
Zheyong Zhang, Jianping Ding, and Hui-Tian Wang
Photonics Research
  • Publication Date: Apr. 24, 2017
  • Vol. 5, Issue 3, 03000224 (2017)
Engineering of strong mechanical squeezing via the joint effect between Duffing nonlinearity and parametric pump driving
Cheng-Hua Bai, Dong-Yang Wang, Shou Zhang, Shutian Liu, and Hong-Fu Wang
Previous works for achieving mechanical squeezing focused mainly on the sole squeezing manipulation method. Here we study how to construct strong steady-state mechanical squeezing via the joint effect between Duffing nonlinearity and parametric pump driving. We find that the 3 dB limit of strong mechanical squeezing can be easily overcome from the joint effect of two different below 3 dB squeezing components induced by Duffing nonlinearity and parametric pump driving, respectively, without the need of any extra technologies, such as quantum measurement or quantum feedback. Especially, we first demonstrate that, in the ideal mechanical bath, the joint squeezing effect just is the superposition of the two respective independent squeezing components. The mechanical squeezing constructed by the joint effect is fairly robust against the mechanical thermal noise. Moreover, different from previous mechanical squeezing detection schemes, which need to introduce an additional ancillary cavity mode, the joint mechanical squeezing effect in the present scheme can be directly measured by homodyning the output field of the cavity with an appropriate phase. The joint idea opens up a new approach to construct strong mechanical squeezing and can be generalized to realize other strong macroscopic quantum effects.
Photonics Research
  • Publication Date: Oct. 23, 2019
  • Vol. 7, Issue 11, 11001229 (2019)
Generation and measurement of arbitrary four-dimensional spatial entanglement between photons in multicore fibers
Hee Jung Lee, and Hee Su Park
High-dimensional entanglement is a valuable resource for secure and efficient quantum information processing. A major challenge for practical use of multidimensional quantum systems is the establishment of controls over arbitrary superposition states in realistic conditions. This work demonstrates spatially entangled photon pairs propagating through two separate four-core optical fibers with the amplitudes and phases of the superposition being independently controllable. Using quantum state analyzers that can detect arbitrary multicore superposition states, Bell-type CGLMP inequalities in two, three, and four dimensions are directly tested. Enhanced violation of the inequality by slight nonmaximality of entanglement is also demonstrated.
Photonics Research
  • Publication Date: Jan. 01, 2019
  • Vol. 7, Issue 1, 01000019 (2019)
Exceptional points of any order in a single, lossy waveguide beam splitter by photon-number-resolved detection|Editors' Pick
Mario A. Quiroz-Juárez, Armando Perez-Leija, Konrad Tschernig, Blas M. Rodríguez-Lara, Omar S. Magaña-Loaiza, Kurt Busch, Yogesh N. Joglekar, and Roberto de J. León-Montiel
Exceptional points (EPs) are degeneracies of non-Hermitian operators where, in addition to the eigenvalues, the corresponding eigenmodes become degenerate. Classical and quantum photonic systems with EPs have attracted tremendous attention due to their unusual properties, topological features, and an enhanced sensitivity that depends on the order of the EP, i.e., the number of degenerate eigenmodes. Yet, experimentally engineering higher-order EPs in classical or quantum domains remain an open challenge due to the stringent symmetry constraints that are required for the coalescence of multiple eigenmodes. Here, we analytically show that the number-resolved dynamics of a single, lossy waveguide beam splitter, excited by N indistinguishable photons and post-selected to the N-photon subspace, will exhibit an EP of order N+1. By using the well-established mapping between a beam splitter Hamiltonian and the perfect state transfer model in the photon-number space, we analytically obtain the time evolution of a general N-photon state and numerically simulate the system’s evolution in the post-selected manifold. Our results pave the way toward realizing robust, arbitrary-order EPs on demand in a single device.
Photonics Research
  • Publication Date: Jul. 18, 2019
  • Vol. 7, Issue 8, 08000862 (2019)
Nonreciprocal unconventional photon blockade in a spinning optomechanical system
Baijun Li, Ran Huang, Xunwei Xu, Adam Miranowicz, and Hui Jing
Photonics Research
  • Publication Date: May. 15, 2019
  • Vol. 7, Issue 6, 06000630 (2019)