Related papers: Unraveling two-photon entanglement via the squeezing spectrum of light traveling through nanofiber-coupled atoms

Unraveling two-photon entanglement via the squeezing spectrum of light traveling through nanofiber-coupled atoms

URL: http://arxiv.org/abs/2010.09450v2
Date: Thu, 29 Jul 2021 15:02:47 GMT
Title: Unraveling two-photon entanglement via the squeezing spectrum of light traveling through nanofiber-coupled atoms
Authors: Jakob Hinney, Adarsh S. Prasad, Sahand Mahmoodian, Klemens Hammerer, Arno Rauschenbeutel, Philipp Schneeweiss, J\"urgen Volz, Max Schemmer
Abstract summary: We observe a weak guided light field transmitted through an ensemble of atoms and an optical nanofiber. From the measured squeezing spectrum we gain access to the phase and amplitude of the energy-time entangled part of the two-photon wavefunction. Our characterization of the entangled two-photon component constitutes a diagnostic tool for quantum optics devices.
Score: 0.0
License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Abstract: We observe that a weak guided light field transmitted through an ensemble of atoms coupled to an optical nanofiber exhibits quadrature squeezing. From the measured squeezing spectrum we gain direct access to the phase and amplitude of the energy-time entangled part of the two-photon wavefunction which arises from the strongly correlated transport of photons through the ensemble. For small atomic ensembles we observe a spectrum close to the lineshape of the atomic transition, while sidebands are observed for sufficiently large ensembles, in agreement with our theoretical predictions. Furthermore, we vary the detuning of the probe light with respect to the atomic resonance and infer the phase of the entangled two-photon wavefunction. From the amplitude and the phase of the spectrum, we reconstruct the real- and imaginary part of the time-domain wavefunction. Our characterization of the entangled two-photon component constitutes a diagnostic tool for quantum optics devices.

Related papers

Correlated relaxation and emerging entanglement in arrays of $Λ$-type atoms [83.88591755871734]
We show that the atomic entanglement emerges in the course of relaxation and persists in the final steady state of the system. Our findings open a new way to engineer dissipation-induced entanglement.
arXiv Detail & Related papers (2024-11-11T08:39:32Z)
Many-photon scattering and entangling in a waveguide with a {\Lambda}-type atom [55.2480439325792]
We show that after transmission of a short few-photon pulse, the final state of the atom and all the photons is a genuine multipartite entangled state belonging to the W class. The parameters of the input pulse are optimized to maximize the efficiency of three- and four-partite W-state production.
arXiv Detail & Related papers (2023-09-25T09:06:28Z)
Two-photon pulse scattering spectroscopy for arrays of two-level atoms, coupled to the waveguide [125.99533416395765]
We have theoretically studied the scattering of two-photon pulses from a spatially-separated array of two-level atoms coupled to a waveguide. The contributions of various single-eigenstate and double-excited eigenstates of the array have been analyzed.
arXiv Detail & Related papers (2023-02-27T22:05:07Z)
Quantum fluctuations in the small Fabry-Perot interferometer [77.34726150561087]
We study the small, of the size of the order of the wavelength, interferometer with the main mode excited by a quantum field from a nano-LED or a laser. We find the field and the photon number fluctuation spectra inside and outside the interferometer. Results help the study, design, manufacture, and use small elements of quantum optical integrated circuits.
arXiv Detail & Related papers (2022-12-27T10:02:25Z)
Tailoring photon statistics with an atom-based two-photon interferometer [0.0]
We actively control the quantum phase between the transmitted and incoherently scattered two-photon component. We observe interference fringes in the normalized photon coincidence rate, varying from antibunching to bunching. Our results lend themselves to the development of novel quantum light sources.
arXiv Detail & Related papers (2022-12-19T16:24:54Z)
Observation of oscillatory Raman gain associated with two-photon Rabi oscillations of nanofiber-coupled atoms [0.0]
Quantum emitters with a $Lambda$-type level structure enable numerous protocols and applications in quantum science and technology. Here, we drive two-photon Rabi oscillations between the two ground states of cesium atoms. We study the dependence of the two-photon Rabi frequency on the system parameters and observe Autler-Townes splitting in the probe transmission spectrum.
arXiv Detail & Related papers (2022-07-01T13:59:26Z)
Quantum interferometric two-photon excitation spectroscopy [7.708943730059219]
We present an approach for quantum interferometric two-photon excitation spectroscopy. Our proposed protocol overcomes the difficulties of engineering two-photon joint spectral intensities and fine-tuned absorption-frequency selection. Results may significantly facilitate the use of quantum interferometric spectroscopy for extracting the information about the electronic structure of the two-photon excited-state manifold of atoms or molecules.
arXiv Detail & Related papers (2021-11-23T15:44:08Z)
Auto-heterodyne characterization of narrow-band photon pairs [68.8204255655161]
We describe a technique to measure photon pair joint spectra by detecting the time-correlation beat note when non-degenerate photon pairs interfere at a beamsplitter. The technique is well suited to characterize pairs of photons, each of which can interact with a single atomic species.
arXiv Detail & Related papers (2021-01-08T18:21:30Z)
Hyperentanglement in structured quantum light [50.591267188664666]
Entanglement in high-dimensional quantum systems, where one or more degrees of freedom of light are involved, offers increased information capacities and enables new quantum protocols. Here, we demonstrate a functional source of high-dimensional, noise-resilient hyperentangled states encoded in time-frequency and vector-vortex structured modes. We generate highly entangled photon pairs at telecom wavelength that we characterise via two-photon interference and quantum state tomography, achieving near-unity visibilities and fidelities.
arXiv Detail & Related papers (2020-06-02T18:00:04Z)
Optical properties of a waveguide-mediated chain of randomly positioned atoms [1.263953193517797]
We study the optical properties of an ensemble of two-level atoms coupled to a one-dimensional waveguide. Results reveal that the optical transport properties of the atomic ensemble are influenced by the lattice constant and the filling factor of the lattice sites.
arXiv Detail & Related papers (2020-03-14T10:17:48Z)

This list is automatically generated from the titles and abstracts of the papers in this site.