scholarly journals The Quantum Regime Operation of Beam Splitters and Interference Filters

2019 ◽  
Author(s):  
Andre Vatarescu
Keyword(s):  
Optical Field ◽  
Single Photons ◽  
Longitudinal Field ◽  
Entangled Photons ◽  
Expectation Values ◽  
Interference Filters ◽  
Beam Splitters ◽  
Dielectric Media ◽  
Straight Line ◽  
Quantum Optical

The quantum Rayleigh spontaneous emission replaces entangled photons with independent ones in homogeneous dielectric media where single photons cannot propagate in a straight line. Single and independent groups of photons, described by the original bare states of Jaynes-Cummings model, deliver the correct expectation values for the number of photons carried by a photonic wavefront, its complex optical field, and phase quadratures. The intrinsic longitudinal field profile associated with a photonic wavefront is derived for any instantaneous number of photons. These photonic properties enable a step-by-step analysis of various beam splitters and interferometric filters. As a result, generalized expressions are derived for the correlation functions characterizing counting of coincident numbers of photons for fourth-order interference, whether classical or quantum optical, without entangled photons.

scholarly journals Optical Chirality and Single-Photon Isolation

2020 ◽  
Author(s):  
Lei Tang ◽  
Keyu Xia
Keyword(s):  
Information Processing ◽  
Quantum Information ◽  
Quantum Information Processing ◽  
Single Photon ◽  
Kerr Nonlinearity ◽  
Single Photons ◽  
Optical Isolation ◽  
Optical Chirality ◽  
Magneto Optical Effect ◽  
Quantum Optical

Optical isolation is important for protecting a laser from damage due to the detrimental back reflection of light. It typically relies on breaking Lorentz reciprocity and normally is achieved via the Faraday magneto-optical effect, requiring a strong external magnetic field. Single-photon isolation, the quantum counterpart of optical isolation, is the key functional component in quantum information processing, but its realization is challenging. In this chapter, we present all-optical schemes for isolating the backscattering from single photons. In the first scheme, we show the single-photon isolation can be realized by using a chiral quantum optical system, in which a quantum emitter asymmetrically couples to nanowaveguide modes or whispering-gallery modes with high optical chirality. Secondly, we propose a chiral optical Kerr nonlinearity to bypass the so-called dynamical reciprocity in nonlinear optics and then achieve room-temperature photon isolation with low insertion loss. The concepts we present may pave the way for quantum information processing in an unconventional way.

Generation of four-photon polarization entangled states with cross-Kerr nonlinearity

2015 ◽  
Vol 13 (05) ◽  
pp. 1550024 ◽  
Author(s):  
Meiyu Wang ◽  
Fengli Yan
Keyword(s):  
Kerr Nonlinearity ◽  
Entangled States ◽  
Entangled State ◽  
Kerr Medium ◽  
Coherent Light ◽  
Photon Polarization ◽  
Beam Splitters ◽  
Ghz States ◽  
Different Types ◽  
Quantum Optical

We show how to prepare three different types of four-photon polarization entangled states among four modes. The scheme only use cross-Kerr medium, polarization beam splitters and X homodyne measurements on coherent light fields, which can be efficiently implemented in quantum optical laboratories. GHZ states and symmetric Dick states can be generated in deterministic way based on the scheme. With the possible availability of suitable strong Kerr nonlinearity, another type of entangled state called genuine four-photon entangled state can be realized as well.

scholarly journals Single photons and entangled photons from a quantum dot

2003 ◽  
Author(s):  
J. Vuckovic ◽  
C. Santori ◽  
D. Fattal ◽  
M. Pelton ◽  
G.S. Solomon ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Single Photons ◽  
Entangled Photons

scholarly journals Heralded Generation of Vectorially Structured Photons With a High Purity

2021 ◽  
Vol 9 ◽  
Author(s):  
Hai-Jun Wu ◽  
Bing-Shi Yu ◽  
Zhi-Han Zhu ◽  
Carmelo Rosales-Guzmán ◽  
Zhi-Yuan Zhou ◽  
...  
Keyword(s):  
High Purity ◽  
Spatial Light Modulator ◽  
Single Photons ◽  
Spin Orbit ◽  
Light Modulator ◽  
Spatial Modes ◽  
Important Approach ◽  
Photonic States ◽  
Quantum Optical

Engineering vector spatial modes of photons is an important approach for manipulating high-dimension photonic states in various quantum optical experiments. In this work, we demonstrate the generation of heralded single photons with well-defined vector spatial modes by using a self-stable polarizing interferometer comprising a spatial light modulator. Specifically, it is shown that, by carefully tailoring and compensating the spatial and temporal amplitudes of manipulated photons, one can exactly convert ultrafast single photons into desired spin-orbit states with an extremely high purity. This compact and robust device provides a versatile way for not only the generation, but also the manipulation and characterization of arbitrary photonic spin-orbit states.

scholarly journals Light in dielectric media and scalar fields in a de Sitter spacetime

2021 ◽  
Vol 81 (8) ◽  
Author(s):  
I. A. Pedrosa ◽  
B. F. Ramos ◽  
K. Bakke
Keyword(s):  
Scalar Field ◽  
Coherent States ◽  
Scalar Fields ◽  
Dielectric Medium ◽  
De Sitter Spacetime ◽  
De Sitter ◽  
Expectation Values ◽  
Dielectric Media ◽  
Sitter Spacetime ◽  
Constant Rate

AbstractIn the present work we discuss the behavior of light in a linear dielectric medium with a time-varying electric permittivity that increases exponentially at a constant rate and of a scalar field in a de Sitter spacetime, in both the classical and quantum contexts. Notably, we find that the behavior of these two systems are identical and can be described by similar Hamiltonians. By using the Lewis–Riesenfeld invariant method together with Fock states we solve the time-dependent Schrödinger equation for this problem and use its solutions to construct coherent states for the scalar field. Finally, we employ both the Fock and coherent states to evaluate some important properties of the quantized scalar field, such as expectation values of the amplitude and momentum of each mode their variances and the respective uncertainty principle.

Degree of polarization as a measurable quantity for a quantum optical field containing variously polarized photons

Open Physics ◽  
2012 ◽  
Vol 10 (2) ◽  
Author(s):  
Lukasz Michalik ◽  
Andrzej Domanski
Keyword(s):  
Free Space ◽  
Thought Experiment ◽  
Optical Field ◽  
Photon Beam ◽  
Degree Of Polarization ◽  
Quantum Field ◽  
Measurable Quantity ◽  
Definition Of ◽  
Quantum Optical ◽  
Polarized Photons

AbstractWe focus on a comparison between the classical and quantum descriptions of the degree of polarization of an optical field. A quantum field containing photons with various states of polarization and which propagate in the same direction in free space one after another (a so called photon beam) is analyzed. We show that the formulated definition of degree of polarization for this quantum field leads to a measurable quantity. The concept of a thought experiment is presented.

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