PhD thesis presentation by Mohsen Akbari

The PhD thesis by  Mohsen Akbari from Kazan E. K. Zavoisky Physical-Technical Institute, Kazan Federal University titled

Three-photon spontaneous dispestion and quantum logic gates in ring micro-resonators

Will be presented 22.06.2017 at 2:00 pm at the conference hall.

Three-photon spontaneous dispestion and quantum logic gates in ring micro-resonators

(c)  Mohsen Akbari

The Physics-Uspekhi’s competition “The best articles and reviews 2015”

Congratulations to the prof. A. M. Zheltikov and his colleagues I. V. Fedotov, A. B. Fedotov  from  the laboratory of Photonics and quantum technologies on winning “The best review 2015” award by Physics-Uspekhi journal for the work

Neurophotonics: optical methods to study and control the brain

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Abstract. Methods of optical physics offer unique opportunities for the investigation of brain and higher nervous activity. The integration of cutting-edge laser technologies and advanced neurobiology opens a new cross-disciplinary direction of natural sciences — neurophotonics, leading to the development of a vast arsenal of tools for functional brain diagnostics, stimulation of individual neurons and neural networks, as well as molecular engineering of brain cells aimed at a diagnosis and therapy of neurodegenerative and psychic diseases. Optical fibers suggest unique approaches helping to confront the most challenging problems in brain research, including the analysis of cellular and molecular mechanisms behind memory and cognition. Optical fibers of new generation offer new solutions for the development of fundamentally new, unique tools for neurophotonics and laser neuroengineering — fiber-optic neuroendoscopes and neurointerfaces. These instruments open new horizons for the investigation of the most complex brain functions, enabling a long-term multiplex detection of fluorescent protein markers, as well as photostimulation of neuronal activity in deep brain areas in living, freely behaving animals with an unprecedented spatial resolution and minimal invasiveness. This emerging technology opens new horizons for understanding learning and long-term memory through experiments with living, freely behaving mammals. Here, we offer a brief review of this rapidly growing field of research.

We wish the authors future success and hope to see more of their work in future!

Optical microfiber using HF etching

Thanks to the efforts of Anatoly Mikhalovich Shegeda the narrowing down of optical fiber down to 1.7 um has been achieved. The narrowing down is achieved due to the hydrofluoric acid etching. We are glad to share the photos with you.

Unaltered fiber approximately 120 um in diameter

Narrow part of the fiber, 1.7um width

Report by M.R. Mohebbifar at 14:00 on 30.03.2016

Tomorrow 30.03.2016 at 14:00 in Kazan Quantum Center M.R. Mohebbifar from Kazan Federal University will present his work titled

“The effect of quantum fluctuations of the interaction between quantum dots and fermionic reservoir on the wave functions and spectral characteristics of the emitted photons”

Specialty 01.04.05 Optics

Supervisor: Professor R. Kh. Gainutdinov

A new research paper by A. Gleym

Secure polarization-independent subcarrier quantum key distribution in optical fiber channel using BB84 protocol with a strong reference

Abstract: 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 optical channel of 10 dB loss, and 18 bits/s with an error of 0.75% over 25 dB of channel loss. To the best of our knowledge, these results represent the highest channel loss reported for secure quantum key distribution using the subcarrier wave approach. A passive unidirectional scheme has been used to compensate for the polarization dependence of the phase modulators in the receiver module, which resulted in a high visibility of 98.8%. The system is thus fully insensitive to polarization fluctuations and robust to environmental changes, making the approach promising for use in optical telecommunication networks. Further improvements in secure key rate and transmission distance can be achieved by implementing the decoy states protocol or by optimizing the mean photon number used in line with experimental parameters.

 View at publisher’s website


Guest lecture by R. R. Nigmatullin

This Thursday at 10:00 on scientific seminar Ravil Rashidovich Nigmatullin will present his latest work titled

“General theory of experiment containing reproducible data: The reduction to an ideal experiment”

by R.R. Nigmatullin, proff at KNRTU-KAI, PhD

The authors suggest a general theory for consideration of all experiments associated with measurements of reproducible data in one unified scheme. The suggested algorithm does not contain unjustified suppositions and the final function that is extracted from these measurements can be compared with hypothesis that is suggested by the theory adopted for the explanation of the object/phenomenon studied. This true function is free from the influence of the apparatus (instrumental) function and when the ‘‘best fit’’, or the most acceptable hypothesis, is absent, can be presented as a segment of the Fourier series. The discrete set of the decomposition coefficients describes the final function quantitatively and can serve as an intermediate model that coincides with the amplitude-frequency response (AFR) of the object studied. It can be used by theoreticians also for comparison of the suggested theory with experimental observations. Two examples (Raman spectra of the distilled water and exchange by packets between two wireless sensor nodes) confirm the basic elements of this general theory. From this general theory the following
important conclusions follow:

1. The Prony’s decomposition should be used in detection of the quasi-periodic processes and for quantitative description of reproducible data.
2. The segment of the Fourier series should be used as the fitting function for description of observable data corresponding to an ideal experiment. The transition from the initial Prony’s decomposition to the conventional Fourier transform implies also the
elimination of the apparatus function that plays an important role in the reproducible data processing.
3. The suggested theory will be helpful for creation of the unified metrological standard (UMS) that should be used in comparison of similar data obtained from the same object studied but in different laboratories with the usage of different equipment. 4. Many cases when the conventional theory confirms the experimental data obtained from equipment (where the apparatus function was not taken into account) should be remeasured and some of the competitive theoretical hypothesis can be reconsidered, as

[1] R.R. Nigmatullin, W. Zhang and D. Striccoli. General theory of experiment containing reproducible data: The reduction to an ideal experiment. Communications in Nonlinear Science and Numerical Simulation, 27, (2015), pp 175-192.


Scientific seminar on 12.02.2016

This week’s scientific seminar will be held in the conference room at 11:00 12.02.2016 in the conference room. This Pr time there will be two reports:

1)      Ravil Urmancheev will update the colleagues on the current research progress in “Area theorem for complicated absorption line”

2)      Mansur Minnegaliev  is going to present “Review of optical spectroscopy works regarding Pr: LiYF4

The start of a scientific seminar

The start of a scientific seminar

19 of November in the Conference hall of our center at 14:30 Laboratory of quantum memory started their weekly seminar sessions. The first presentation was devoted to the Er3+:Y2SiO5 famous for its homogeneous absorption linewidth of only 73 Hz, which is thinner than in any other known solid state material. The presentation “An overview of properties of Er3+:Y2SiO5 for photon echo” by Ravil Urmancheev touched on the properties of 4I15/2 -> 4I13/2 transition in Er.

Mahmood Sabooni

Mahmood Sabooni

For about two months we had a pleasure of working with Mahmood Sabooni, one of the top experimentalists in the field of optical quantum memory. His group achieved one of the records in solid state photon QM. He helped us set up and carry out the first basic experiments of photon echo and has been just a great person to have around. He has been the first of hopefully many guest researchers in or center needless to say that we have enjoyed his company a lot and hope to see him again next summer.
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