Results 61 to 70 of about 3,503,750 (176)
EPJ Web of Conferences, 2017 We consider the generation of single-photon states with orbital angular momentum in the process of spontaneous parametric down-conversion in a nonlinear crystal placed in a cavity.
Turyikhanov Dinislam +3 more
doaj +1 more source
Eliminating spectral distinguishability in ultrafast spontaneous parametric down-conversion [PDF]
Physical Review A, 2009 Generation of polarization-entangled photon pairs with a precise timing through down-conversion of femtosecond pulses is often faced with a degraded polarization entanglement quality. In a previous experiment we have shown that this degradation is induced by spectral distinguishability between the two decay paths, in accordance with theoretical ...
Poh, H.S. +4 more
openaire +2 more sources
Sub-megahertz narrow-band photon pairs at 606 nm for solid-state quantum memories
APL Photonics, 2020 We report on the development of a source of ultra-narrow-band photon pairs using the cavity-enhanced spontaneous parametric down conversion. The photon-pair source has a bandwidth of 265 ± 15 kHz at 606 nm and a spectral brightness of 216 ± 5 pairs/(s ...
Jianji Liu +3 more
doaj +1 more source
EPJ Web of Conferences, 2018 We consider the peculiarities of formation and registration of axially symmetric vortex fields in the context of applying diffractive optical elements such as vortex lenses and vortex axicons for the generation of single-photon states with a nonzero ...
Turaykhanov D.A. +7 more
doaj +1 more source
S/N ratio of an upconversion detector dominated by upconverted spontaneous parametric down-conversion noise [PDF]
, 2018 We designed an upconversion detector (UCD) for 1575 nm operation. The signal-to-noise ratio of the UCD is investigated by considering the dependence of upconversion efficiency and upconverted spontaneous parametric down-conversion noise on pump power.
Høgstedt, Lasse +9 more
core +1 more source
Quantifying tripartite spatial and energy-time entanglement in nonlinear optics
Physical Review Research, 2022 In this work, we provide a means to quantify genuine tripartite entanglement in arbitrary (pure and mixed) continuous-variable states as measured by the tripartite entanglement of formation—a resource-based measure quantifying genuine multipartite ...
James Schneeloch +5 more
doaj +1 more source
, 2016 We report a series of experimental studies on single-mode fiber coupling of entangled photon pairs in type-II spontaneous parametric down-conversion.
Kwon, O +5 more
core +1 more source
Spontaneous Parametric Down-Conversion and Quantum Entanglement
, 2017 Quantum entanglement has been a topic of much research in modern physics, and an application in quantum computing is envisioned. This thesis address the use of polarization entangled photon pairs produced by spontaneous parametric down-conversion (SPDC) in entanglement transfer process and quantum computing. The simplicity of SPDC entanglement relative
openaire +3 more sources
Development Prospects and Enginering of Quantum Communication Systems in the Atmosphere
EPJ Web of Conferences, 2015 Scheme of quantum key distribution with polarization coding based on parametric scattering in the crystal PPKTP was desined. The possibility of application of this scheme, together with atmospheric satellites was researched. The possibility of changes to
Shkalikov A.V. +3 more
doaj +1 more source
Localization of one-photon state in space and Einstein-Podolsky-Rosen paradox in spontaneous parametric down conversion [PDF]
, 1992 An experiment on one-photon state localization in space using a correlation technique in Spontaneous Parametric Down Conversion (SPDC) process is discussed.
Reutova, T. A. +2 more
core