Generation and characterization of discrete spatial entanglement in multimode nonlinear waveguides
arXiv:1701.05769 · doi:10.1103/PhysRevA.95.032322
Abstract
We analyze theoretically spontaneous parametric down-conversion in a multimode nonlinear waveguide as a source of entangled pairs of spatial qubits, realized as superpositions of a photon in two orthogonal transverse modes of the waveguide. It is shown that by exploiting intermodal dispersion, down-conversion into the relevant pairs of spatial modes can be selected by spectral filtering, which also provides means to fine-tune the properties of the generated entangled state. We also discuss an inverting interferometer detecting the spatial parity of the input beam as a versatile tool to characterize properties of the generated state. A single-photon Wigner function obtained by a scan of the displaced parity can be used to identify the basis modes of spatial qubit, whereas correlations between displaced parity measurements on two photons can directly verify quantum entanglement through a violation of Bell's inequalities.
References in corpus (27)
- Space Division Multiplexing in Optical Fibres
- Photonic quantum technologies
- Quantum Entanglement of High Angular Momenta
- Generation of Hyperentangled Photons Pairs
- Free-space quantum key distribution by rotation-invariant twisted photons
- Quantum optics in the phase space - A tutorial on Gaussian states
- Photon temporal modes: a complete framework for quantum information science
- Closing the detection loophole in Bell experiments using qudits
- A bright, pulsed two-mode squeezer
- Single-Mode Parametric-Down-Conversion States with 50 Photons as a Source for Mesoscopic Quantum Optics
- EPR-based ghost imaging using a single-photon-sensitive camera
- Hologram of a Single Photon
- Quantum Mutual Information Capacity for High Dimensional Entangled States
- Quantum Interference between Transverse Spatial Waveguide Modes
- Direct Measurement of the Spatial-Spectral Structure of Waveguided Parametric Down-Conversion
- Direct measurement of spatial Wigner function with area-integrated detection
- Measurement of the transverse spatial quantum state of light at the single-photon level
- Modal, Spectral, and Polarization Entanglement in Guided-Wave Parametric Down-Conversion
- Experimental characterization of three-wave mixing in a multimode nonlinear KTiOPO_4 waveguide
- Synthesis and Analysis of Entangled Photonic Qubits in Spatial-Parity Space
- Einstein-Podolsky-Rosen paradox in a hybrid bipartite system
- Dispersion-based control of modal characteristics for parametric down-conversion in a multimode waveguide
- High-visibility nonclassical interference of photon pairs generated in a multimode nonlinear waveguide
- Spatial and spectral properties of the pulsed second-harmonic generation in a PP-KTP waveguide
- Stable Mode Sorting by Two-Dimensional Parity of Photonic Transverse Spatial States
- Scheme for on-chip verification of transverse mode entanglement using the electro-optic effect
- Generation of spatially pure photon pairs in a multimode nonlinear waveguide using intermodal dispersion