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- Timur Iskhakov, Maria V Chekhova, Gerd Leuchs
- Physical review letters
- 2009

Using a traveling-wave optical parametric amplifier with two orthogonally oriented type-I BBO crystals pumped by picosecond pulses, we generate vertically and horizontally polarized squeezed vacuum states within a broad frequency-angular range. Depending on the phase between these states, fluctuations in one or another Stokes parameter are suppressed below… (More)

- Angela M. Pérez, Kirill Yu Spasibko, Polina R. Sharapova, Olga V. Tikhonova, Gerd Leuchs, Maria V. Chekhova
- Nature communications
- 2015

Walk-off effects, originating from the difference between the group and phase velocities, limit the efficiency of nonlinear optical interactions. While transverse walk-off can be eliminated by proper medium engineering, longitudinal walk-off is harder to avoid. In particular, ultrafast twin-beam generation via pulsed parametric down-conversion and four-wave… (More)

- Dmitry Kalashnikov, Maria Chekhova, Leonid Krivitsky
- CLEO: 2011 - Laser Science to Photonic…
- 2011

The intensity correlation function of squeezed vacuum, produced in an OPA, was measured with a photon-number resolving multi-pixel detector (MPPC). Based on realistic MPPC model, strong photon bunching was revealed for low-gain OPA radiation.

- Giorgio Brida, Maria Chekhova, Marco Genovese, Alexander Penin, Maria Luisa Rastello, Ivano Ruo-Berchera
- IEEE Trans. Instrumentation and Measurement
- 2007

— In this paper we report our systematic study of a promising absolute calibration technique of analog photo-detectors, based on the properties of parametric down conversion. Our formal results and a preliminary uncertainty analysis show that the proposed method can be effectively developed with interesting applications to metrology. I. INTRODUCTION In… (More)

- Giorgio Brida, Maria Chekhova, Marco Genovese, Marco Gramegna, Leonid Krivitsky, Maria Luisa Rastello
- IEEE Trans. Instrumentation and Measurement
- 2005

—We propose a new scheme for measuring the quantum efficiency of photon counting detectors by using correlated pho-tons. The measurement technique is based on a 90 rotation of the polarization of one photon member of a correlated pair produced by parametric down-conversion, conditioned on the detection of the other correlated photon after polarization… (More)

- A V Burlakov, L A Krivitskiy, S P Kulik, G A Maslennikov, M V Chekhova
- 2002

We proposed the procedure of measuring the unknown state of the three-level system – the qutrit, which was realized as the arbitrary polarization state of the single-mode biphoton field. This procedure is accomplished for the set of the pure states of qutrits; this set is defined by the properties of SU(2) transformations, that are done by the polarization… (More)

- Maria Chekhova
- 2015

Researchers characterize the multiple ways of entanglement that exist between different frequency bands in a down-converted frequency comb. Entanglement underlies all of quantum information science. It is most familiar as a relation between two parts of a single system, in which the properties of each part—taken separately—are uncertain but at the same time… (More)

- M. V. Chekhova, T. Sh Iskhakov, G. O. Rytikov, K. Yu Spasibko, O. A. Tscherbina
- 2014 International Conference on Computer…
- 2014

We discuss the fundamental problems of nonclassical correlations and microscopic entanglement experimental observation possibility for multiphoton quantum light beams. Optical beams of multiphoton nonclassical light are of practical interest due to possibility of applications in quantum metrology and quantum informatics. Quantum macroscopic states of light… (More)

- Alessio Avella, Marco Gramegna, Alexander Shurupov, Giorgio Brida, Maria Chekhova, Marco Genovese
- 2014 Conference on Lasers and Electro-Optics…
- 2014

Two-Photon Spectral Amplitude of entangled states is engineered to produce a losslessly decomposition in non-overlapping single Schmidt modes. The method relies on spontaneous parametric down-conversion pumped by a comb-like spectrum radiation.

- T Sh Iskhakov, A M Pérez, K Yu Spasibko, M V Chekhova, G Leuchs
- Optics letters
- 2012

In this Letter, we experimentally study the statistical properties of a bright squeezed vacuum state containing up to 10(13) photons per mode (10 μJ per pulse), produced via high-gain parametric down conversion (PDC). The effects of bunching and superbunching of photons were observed for a single-mode PDC radiation by second-order intensity correlation… (More)