Flat-optics generation of broadband photon pairs with tunable polarization entanglement

• URL: http://arxiv.org/abs/2201.09517v2
• Date: Mon, 14 Feb 2022 11:50:52 GMT
• Title: Flat-optics generation of broadband photon pairs with tunable polarization entanglement
• Authors: Vitaliy Sultanov, Tom\'as Santiago-Cruz, Maria Chekhova
• Abstract summary: Polarization entanglement is central to quantum photonics due to the simplicity of polarization qubit encoding and control. We use relaxed phase matching of flat nonlinear optical sources to generate photon pairs with tunable polarization entanglement. In combination with the broadband frequency spectrum, it results in an ultranarrow (12 fs) Hong-Ou-Mandel effect and promises extensions to hyperentanglement.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: The concept of `flat optics' is quickly conquering different fields of photonics, but its implementation in quantum optics is still at infancy. In particular, polarization entanglement, which is central to quantum photonics due to the simplicity of polarization qubit encoding and control, is so far not realized on flat platforms. Meanwhile, relaxed phase matching of flat nonlinear optical sources enables enormous freedom in tailoring their polarization properties. Here we use this freedom to generate photon pairs with tunable polarization entanglement via spontaneous parametric down-conversion (SPDC) in a $400$ nm GaP film. By changing the pump polarization, we tune the polarization state of photon pairs from maximally entangled to almost disentangled, which is impossible in a single bulk source of SPDC. Polarization entanglement, in combination with the broadband frequency spectrum, results in an ultranarrow (12 fs) Hong-Ou-Mandel effect and promises extensions to hyperentanglement.

Related papers

• Electrically tunable quantum correlations of dipolar polaritons with micrometer-scale blockade radii [1.2147217809224073]
  An extreme yet reconfigurable nonlinear response to a single photon by a photonic system is crucial for realizing a universal two-photon gate. Here we demonstrate electrically tunable partial photon blockade in dipolar waveguide polaritons on a semiconductor chip.
  arXiv  Detail & Related papers  (2024-11-18T20:57:57Z)
• Polarization-entangled photon pairs generation from a single lithium niobate waveguide with single poling period [7.30580496740769]
  We propose a simple and efficient scheme to generate polarization-entangled photon pairs based on type-0 SPDC. By utilizing the strong dispersion engineering capabilities of thin-film waveguides, we can achieve both degenerate and highly detuned entangled photon pairs.
  arXiv  Detail & Related papers  (2024-10-30T08:08:51Z)
• Quantum Pair Generation in Nonlinear Metasurfaces with Mixed and Pure Photon Polarizations [0.09423257767158633]
  We present a solution by achieving polarization engineering of frequency-nondegenerate biphotons emitted via spontaneous parametric down-conversion. By performing a comprehensive polarization tomography, we demonstrate that the polarization of the emitted photons directly reflects the qBIC mode's far-field properties.
  arXiv  Detail & Related papers  (2024-09-06T19:17:11Z)
• All-optical modulation with single-photons using electron avalanche [69.65384453064829]
  We demonstrate all-optical modulation using a beam with single-photon intensity. Our approach opens up the possibility of terahertz-speed optical switching at the single-photon level.
  arXiv  Detail & Related papers  (2023-12-18T20:14:15Z)
• Entangling entanglement: coupling frequency and polarization of biphotons on demand [7.450721110075674]
  Quantum information is often carried in the frequency and polarization degrees of freedom (DoFs) in single photons and entangled photons. We show a new approach to couple and decouple the frequency and polarization DoFs of broadband biphotons. Our approach offers a convenient means of tuning the polarization entanglement and can be employed for arbitrary biphoton polarization state generation.
  arXiv  Detail & Related papers  (2023-11-23T19:35:50Z)
• Optical polaron formation in quantum systems with permanent dipoles [0.0]
  We derive a master equation for optically active systems with spatially asymmetric electron orbitals. Permanent dipole moments can significantly affect the system dynamics and create polarised Fock states of light. We derive the emission spectrum of the system, highlighting experimentally detectable signatures of optical polarons.
  arXiv  Detail & Related papers  (2023-03-07T15:52:54Z)
• Resolving Fock states near the Kerr-free point of a superconducting resonator [51.03394077656548]
  We have designed a tunable nonlinear resonator terminated by a SNAIL (Superconducting Asymmetric Inductive eLement) We have excited photons near this Kerr-free point and characterized the device using a transmon qubit.
  arXiv  Detail & Related papers  (2022-10-18T09:55:58Z)
• Ultrabright and narrowband intra-fiber biphoton source at ultralow pump power [51.961447341691]
  Nonclassical photon sources of high brightness are key components of quantum communication technologies. We here demonstrate the generation of narrowband, nonclassical photon pairs by employing spontaneous four-wave mixing in an optically-dense ensemble of cold atoms within a hollow-core fiber.
  arXiv  Detail & Related papers  (2022-08-10T09:04:15Z)
• Telecom-band Hyperentangled Photon Pairs from a Fiber-based Source [49.06242674127539]
  We experimentally demonstrate the generation of telecom-band biphotons hyperentangled in both the polarization and frequency DoFs. The states produced by our hyperentanglement source can enable protocols such as dense coding and high-dimensional quantum key distribution.
  arXiv  Detail & Related papers  (2021-12-06T21:37:43Z)
• Topologically Protecting Squeezed Light on a Photonic Chip [58.71663911863411]
  Integrated photonics offers an elegant way to increase the nonlinearity by confining light strictly inside the waveguide. We experimentally demonstrate the topologically protected nonlinear process of spontaneous four-wave mixing enabling the generation of squeezed light on a silica chip.
  arXiv  Detail & Related papers  (2021-06-14T13:39:46Z)
• Enhanced generation of non-degenerate photon-pairs in nonlinear metasurfaces [55.41644538483948]
  Non-degenerate photon-pair generation can enable orders-of-surface enhancement of the photon rate and spectral brightness. We show that the entanglement of the photon-pairs can be tuned by varying the pump polarization, which can underpin future advances and applications of ultra-compact quantum light sources.
  arXiv  Detail & Related papers  (2021-04-15T08:20:17Z)

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

This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.