Photon polarization
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Observation of the Unconventional Photon Blockade Open
We observe the unconventional photon blockade effect in quantum dot cavity QED, which, in contrast to the conventional photon blockade, operates in the weak coupling regime. A single quantum dot transition is simultaneously coupled to two …
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Photonic spin Hall effect in metasurfaces: a brief review Open
The photonic spin Hall effect (SHE) originates from the interplay between the photon-spin (polarization) and the trajectory (extrinsic orbital angular momentum) of light, i.e. the spin-orbit interaction. Metasurfaces, metamaterials with a …
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Bright Polarized Single-Photon Source Based on a Linear Dipole Open
Semiconductor quantum dots in cavities are promising single-photon sources. Here, we present a path to deterministic operation, by harnessing the intrinsic linear dipole in a neutral quantum dot via phonon-assisted excitation. This enables…
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Secure polarization-independent subcarrier quantum key distribution in optical fiber channel using BB84 protocol with a strong reference Open
A quantum key distribution system based on the subcarrier wave modulation method has been demonstrated which employs the BB84 protocol with a strong reference to generate secure bits at a rate of 16.5 kbit/s with an error of 0.5% over an o…
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Hyperentanglement purification for two-photon six-qubit quantum systems Open
Recently, two-photon six-qubit hyperentangled states were produced in\nexperiment and they can improve the channel capacity of quantum communication\nlargely. Here we present a scheme for the hyperentanglement purification of\nnonlocal two…
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Theory of radiative electron polarization in strong laser fields Open
Radiative polarization of electrons and positrons through the Sokolov-Ternov\neffect is important for applications in high-energy physics. Radiative\nspin-polarization is a manifestation of quantum radiation reaction affecting\nthe spin-dy…
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Efficient and pure femtosecond-pulse-length source of polarization-entangled photons Open
We present a source of polarization entangled photon pairs based on spontaneous parametric downconversion engineered for frequency uncorrelated telecom photon generation. Our source provides photon pairs that display, simultaneously, the k…
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Raman Optical Activity Using Twisted Photons Open
Raman optical activity underpins a powerful vibrational spectroscopic technique for obtaining detailed structural information about chiral molecular species. The effect centers on the discriminatory interplay between the handedness of mate…
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Measuring the quantum geometric tensor in two-dimensional photonic and exciton-polariton systems Open
We first consider a generic two-band model which can be mapped to a\npseudospin on a Bloch sphere. We establish the link between the pseudospin\norientation and the components of the quantum geometric tensor (QGT): the\nmetric tensor and t…
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High-performance source of spectrally pure, polarization entangled photon pairs based on hybrid integrated-bulk optics Open
Entangled photon pair sources based on bulk optics are approaching optimal design and implementation, with high state fidelities, spectral purities and heralding efficiencies, but generally low brightness. Integrated entanglement sources, …
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Hyperentanglement of Photons Emitted by a Quantum Dot Open
A hyperentangled state of light represents a valuable tool capable of reducing the experimental requirements and resource overheads, and it can improve the success rate of quantum information protocols. Here, we report on demonstration of …
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Nonlinear Compton scattering of polarized photons in plane-wave backgrounds Open
We investigate the phenomenology of nonlinear Compton scattering of polarised\nphotons by unpolarised electrons in plane-wave backgrounds. The energy and\nangular spectra of polarised photons are calculated for linearly- and\ncircularly-po…
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Versatile total angular momentum generation using cascaded J-plates Open
Optical elements coupling the spin and orbital angular momentum (SAM/OAM) of light have found a range of applications in classical and quantum optics. The J-plate, with J referring to the photon's total angular momentum (TAM), is a metasur…
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Field implementation of long-distance quantum key distribution over aerial fiber with fast polarization feedback Open
Quantum key distribution with polarized qubits has not yet been realized over the aerial fiber, due to rapid polarization changes. Here, we report our recent work towards quantum communication through an aerial fiber channel. We designed a…
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Generation of highly-polarized high-energy brilliant <i>γ</i>-rays via laser-plasma interaction Open
The generation of highly polarized high-energy brilliant γ-rays via laser–plasma interaction is investigated in the quantum radiation-reaction regime. We employ a quantum electrodynamics particle-in-cell code to describe spin-resolved elec…
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Photon-axion conversion, magnetic field configuration, and polarization of photons Open
We study the evolution of photon polarization during the photon-axion\nconversion process with focusing on the magnetic field configuration\ndependence. Most previous studies have been carried out in a conventional model\nwhere a network o…
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Loops and polarization in strong-field QED Open
In a previous paper we showed how higher-order strong-field-QED processes in long laser pulses can be approximated by multiplying sequences of ‘strong-field Mueller matrices’. We obtained expressions that are valid for arbitrary field shap…
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Quantum State Transfer from a Single Photon to a Distant Quantum-Dot Electron Spin Open
Quantum state transfer from flying photons to stationary matter qubits is an important element in the realization of quantum networks. Self-assembled semiconductor quantum dots provide a promising solid-state platform hosting both single p…
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Implementation security of quantum key distribution due to polarization-dependent efficiency mismatch Open
Einstein-Podolsky-Rosen (EPR) steering, as one of the most intriguing\nphenomenon of quantum mechanics, is a useful quantum resource for quantum\ncommunication. Understanding the type of EPR steering in a graph state is the\nbasis for appl…
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Polarized QED cascades Open
By taking the spin and polarization of the electrons, positrons and photons into account in the strong-field QED processes of nonlinear Compton emission and pair production, we find that the growth rate of QED cascades in ultra-intense las…
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Scalable spin–photon entanglement by time-to-polarization conversion Open
The realization of quantum networks and quantum computers relies on the scalable generation of entanglement, for which spin-photon interfaces are strong candidates. Current proposals to produce entangled-photon states with such platforms p…
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Ellipticity of photon emission from strongly magnetized hot QCD plasma Open
By making use of an explicit representation for the imaginary part of the\nphoton polarization tensor in terms of transitions between the Landau levels of\nlight quarks, we study the angular dependence of direct photon emission from a\nstr…
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Giant photonic spin Hall effect near the Dirac points Open
The origin of spin-orbit interaction of light at a conventional optical\ninterface lies in the transverse nature of the photon polarization: The\npolarizations associated with the plane-wave components experience slightly\ndifferent rotati…
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Observation of the quantum paradox of separation of a single photon from one of its properties Open
We report an experimental realization of the quantum paradox of the separation of a single photon from one of its properties (the so-called "quantum Cheshire cat"). We use a modified Sagnac interferometer with displaced paths to produce ap…
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Photon merging and splitting in electromagnetic field inhomogeneities Open
We investigate photon merging and splitting processes in inhomogeneous, slowly varying electromagnetic fields. Our study is based on the three-photon polarization tensor following from the Heisenberg-Euler effective action. We put special …
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Unveiling the photonic spin Hall effect with asymmetric spin-dependent splitting Open
The photonic spin Hall effect (SHE) manifests itself as the spin-dependent splitting of light beam. Usually, it shows a symmetric spin-dependent splitting, i.e., the left- and right-handed circularly polarized components are equally separa…
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Fully polarized nonlinear Breit-Wheeler pair production in pulsed plane waves Open
Fully polarized nonlinear Breit-Wheeler pair production from a beam of\npolarized seed photons is investigated in pulsed plane-wave backgrounds. The\nparticle (electron and positron) spin and photon polarization are\ncomprehensively descri…
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Extending geometrical optics: A Lagrangian theory for vector waves Open
Even when neglecting diffraction effects, the well-known equations of geometrical optics (GO) are not entirely accurate. Traditional GO treats wave rays as classical particles, which are completely described by their coordinates and moment…
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Polarization effects in nonlinear interference of down-converted photons Open
We study polarization effects in the nonlinear interference of photons generated via frequency nondegenerate spontaneous parametric-down conversion. Signal and idler photons, which are generated in the visible and infrared (IR) range, resp…
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Electron spin- and photon polarization-resolved probabilities of strong-field QED processes Open
A derivation of fully polarization-resolved probabilities is provided for high-energy photon emission and electron-positron pair production in ultrastrong laser fields. The probabilities resolved in both electron spin and photon polarizati…