109 citations · 164 across the 13 of their papers we have counts for
14 papers
A robust framework for the comprehensive characterisation of parametric down-conversion sources
Denis A. Kopylov, Michael Stefszky, Christine Silberhorn
Reliable verification of squeezed-light sources is essential for photonic quantum technologies. High-dimensional quantum optical networks demand single-mode, pure squeezed states w…
An ultra-bright, highly-scalable, squeezed light source for hybrid quantum photonics
Kai-Hong Luo, Denis Kopylov, Florian Lütkewitte +8
Hybrid quantum photonics seeks to combine the complementary advantages of continuous- and discrete-variable quantum optics. This typically entails photon-counting measurements on e…
Gain-induced spectral non-degeneracy in type-II parametric down-conversion
Behnood Taheri, Denis Kopylov, Manfred Hammer +3
We demonstrate the novel effect of gain-induced spectral shifts in the type-II parametric down-conversion (PDC) process, which results in a transition from degenerate to non-degene…
Classical and quantum electromagnetic momentum in anisotropic optical waveguides
Denis Kopylov, Manfred Hammer
The guided modes supported by dielectric channel waveguides act as individual carriers of momentum. We show this by proving that the modes satisfy an orthogonality condition which…
Measurement-induced cubic phase state generation
Harsh Kashyap, Denis A. Kopylov, Polina R. Sharapova
The cubic phase state constitutes a nonlinear resource that is essential for universal quantum computing protocols. However, constructing such non-classical states faces many chall…
Bipartite entanglement extracted from multimode squeezed light generated in lossy waveguides
Denis A. Kopylov, Torsten Meier, Polina R. Sharapova
Entangled two-mode Gaussian states constitute an important building block for continuous variable quantum computing and communication protocols. In this work, we theoretically stud…
Multiphoton, multimode state classification for nonlinear optical circuits
Denis A. Kopylov, Christian Offen, Laura Ares +5
We introduce a new classification of multimode states with a fixed number of photons. This classification is based on the factorizability of homogeneous multivariate polynomials an…
Spectral and temporal properties of type-II parametric down-conversion: The impact of losses during state generation
Denis A. Kopylov, Michael Stefszky, Torsten Meier +2
In this paper, we theoretically study spectral and temporal properties of pulsed spontaneous parametric down-conversion (SPDC) generated in lossy waveguides. Our theoretical approa…
Nonlinear squeezing generation via multimode PDC and single photon measurement
Vojtěch Kala, Denis Kopylov, Petr Marek +1
Nonlinear squeezing is a property of non-Gaussian states of light with an important application in continuous variable quantum computing. We study the generation of nonlinear squee…
Theory of Multimode Squeezed Light Generation in Lossy Media
Denis A. Kopylov, Torsten Meier, Polina R. Sharapova
A unified theoretical approach to describe the properties of multimode squeezed light generated in a lossy medium is presented. This approach is valid for Markovian environments an…
Quantum spatial dynamics of high-gain parametric down-conversion accompanied by cascaded up-conversion
A. V. Rasputnyi, D. A. Kopylov
Quantum cascaded up-conversion (CUpC) of parametric down conversion (PDC) in a finite nonlinear -crystal is studied theoretically within parametric approximation. The exac…
Study of broadband multimode light via non-phase-matched sum frequency generation
Denis A. Kopylov, Kirill Yu. Spasibko, Tatiana V. Murzina +1
We propose non-phase-matched sum frequency generation (SFG) as a method for characterizing broadband multimode light. We demonstrate its advantages using high-gain parametric down…
Multiphoton Effects Enhanced Due to Ultrafast Photon-Number Fluctuations
Kirill Yu. Spasibko, Denis A. Kopylov, Victor L. Krutyanskiy +3
Multi-photon processes are the essence of nonlinear optics. Optical harmonics generation and multi-photon absorption, ionization, polymerization or spectroscopy are widely used in…
Ring-shaped spectra of parametric down-conversion and entangled photons that never meet
Kirill Spasibko, Denis Kopylov, Tatiana Murzina +2
We report on the observation of an unusual type of parametric down-conversion. In the regime where collinear degenerate emission is in the anomalous range of group-velocity dispers…