Results 31 to 40 of about 43,116 (278)

Measurement of two-photon position–momentum Einstein–Podolsky–Rosen correlations through single-photon intensity measurements

New Journal of Physics, 2022
The measurement of the position–momentum Einstein–Podolsky–Rosen (EPR) correlations of a two-photon state is important for many quantum information applications ranging from quantum key distribution to coincidence imaging.
Abhinandan Bhattacharjee, Nilakantha Meher, Anand K Jha   +2 more
doaj   +1 more source

Towards spontaneous parametric down-conversion at low temperatures

EPJ Web of Conferences, 2017
The possibility of observing spontaneous parametric down-conversion in doped nonlinear crystals at low temperatures, which would be useful for combining heralded single-photon sources and quantum memories, is studied theoretically.
Akatiev Dmitrii, Boldyrev Kirill, Kuzmin Nikolai, Latypov Ilnur, Popova Marina, Shkalikov Andrey, Kalachev Alexey   +6 more
doaj   +1 more source

Full characterization of spontaneous parametric down conversion in non-ideal quarter-wavelength semiconductor Bragg reflection waveguide

Frontiers in Physics, 2023
Entangled photons are important for testing foundations of quantum physics and are at the heart of quantum technology. Integrated photonics has overwhelming dominance in terms of density and performance, making it a promise route for scalable quantum ...
Bin Niu, Bin Niu, Cheng Qian, Xu Jing, Xu Jing, Chenquan Wan, Chenquan Wan, Yuechan Kong, Yuechan Kong, Tangsheng Chen, Tangsheng Chen, Yichen Liu, Yichen Liu, Liangliang Lu, Liangliang Lu, Liangliang Lu   +15 more
doaj   +1 more source

The Source of Time-Correlated Photons at 1.064 μm and its Applications

EPJ Web of Conferences, 2015
The source of time-correlated photon-pairs at 1064 nm is described. The source consists of the spontaneous parametric down-conversion (SPDC) generator, pumped by cw laser operating at 532 nm, and the measuring and control appliances.
Gostev P.P., Magnitsky S.A., Nagorsky N.M., Protsenko I.E., Saygin M.Yu., Turaev M.A., Firsov V.V., Frolovtsev D.N., Yakovlev D.V.   +8 more
doaj   +1 more source

Polarization-Angle SPDC Spectrum and its Effect on Generated Photon States

EPJ Web of Conferences, 2015
Analytical formulas for vector components of the polarization vector of spontaneous parametric down-conversion (SPDC) radiation in the degenerated regime and its dependencies on the angle between the principal sections for the pump and SPDC rays are ...
Agapov A., Gostev P., Magnitskya S., Firsov V., Frolovtsev D.   +4 more
doaj   +1 more source

Nonperturbative theory of spontaneous parametric down-conversion in open and dispersive optical systems

Physical Review Research, 2023
We develop a nonperturbative formulation based on the Green's function quantization method that can describe spontaneous parametric down-conversion in the high-gain regime in nonlinear optical structures with arbitrary amount of loss and dispersion. This
Aleksa Krstić, Frank Setzpfandt, Sina Saravi   +2 more
doaj   +1 more source

Multi-Parameter Entanglement in Femtosecond Parametric Down-Conversion [PDF]

, 2001
A theory of spontaneous parametric down-conversion, which gives rise to a quantum state that is entangled in multiple parameters, such as three-dimensional wavevector and polarization, allows us to understand the unusual characteristics of fourth-order ...
A. Joobeur, A. Migdall, Alexander V. Sergienko, B. E. A. Saleh, B. E. A. Saleh, B. R. Mollow, Bahaa E. A. Saleh, C. H. Monken, C. K. Hong, D. Magde, E. Schrödinger, E. Schrödinger, E. Schrödinger, G. Di Giuseppe, Giovanni Di Giuseppe, J. G. Rarity, J. Peřina, Jr., M. Atatüre, Malvin C. Teich, Matthew D. Shaw, Mete Atatüre, P. G. Kwiat, P. G. Kwiat, S. E. Harris, T. E. Keller, W. P. Grice, Y. H. Shih, Y. H. Shih, Z. Y. Ou   +28 more
core   +2 more sources

Multi-qubit production in spontaneous parametric down conversion [PDF]

Frontiers in Optics + Laser Science 2021, 2021
We present a novel yet simple approach to produce multiple entangled photon pairs through spontaneous parametric down conversion (SPDC). We have designed Gaussian masks to subdivide the pump beam before passing it through a nonlinear medium. In this way, we are able to observe simultaneous separate down converted emission cones with spatial overlap ...
Heitert, Phillip, Buldt, Finn, Bassene, Pascal, N'Gom, Moussa   +3 more
openaire   +2 more sources

Quality of polarization entanglement in spontaneous parametric down conversion

EPJ Web of Conferences, 2017
We experimentally demonstrated a high degree of polarization entanglement known as entanglement visibility through spontaneous parametric down conversion process pumped by a femtosecond laser.
Ali N, Soekardjo S, Saharudin S., Wahiddin M. R. B.   +3 more
doaj   +1 more source

Controlling the Spectrum of Spontaneous Parametric Down-Conversion in Nonlinear Crystals by External Electric Field

EPJ Web of Conferences, 2015
. We discuss the possibilities of controlling the spectrum of correlated photons generated via spontaneous parametric down-conversion by using external homogeneous electric field acting on the nonlinear crystal.
Akatiev D.O., Kalachev A.A.
doaj   +1 more source