published April 19, 2016

posted in Без рубрики

published April 7, 2016

posted in Без рубрики

This Friday in KQC as part of the international youth science and technology conference **“Applied electrodynamics, photonics and living systems-2016”** there will be held an affiliated meeting titled “**Quantum optics and communications**“. The session will take place at 10:00 in the conference hall of the center and will feature presenters from several Kazan universities as well as KQC employees.

Each presentation is to be less than 10 minutes long with 5 additional minutes for questions.

published March 29, 2016

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

Specialty 01.04.05 Optics

Supervisor: Professor **R. Kh. Gainutdinov**

published February 26, 2016

**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.

published February 17, 2016

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

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

well.

published February 10, 2016

This week’s scientific seminar will be held in the conference room at 11:00 12.02.2016 in the conference room. This 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: LiYF_{4}”

published November 25, 2015

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 Er^{3+}:Y_{2}SiO_{5} 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 Er^{3+}:Y_{2}SiO_{5} for photon echo” by Ravil Urmancheev touched on the properties of ^{4}I_{15/2} -> ^{4}I_{13/2} transition in Er.

published September 29, 2015

posted in News of the QC

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. |

published November 10, 2014

posted in Без рубрики

**КВАНТОВАЯ ОПТИКА И КОММУНИКАЦИИ (секции №5 конференции ОТТ-2014)**

**QUANTUM OPTICS AND COMMUNICATION (Session ****№5 ****Conference OTT-2014)**

**Kazan National Research Technical University, Building ****№ 8, ****address: str. Chetaeva 18-a,**

(on the crossing of str. Amirkhana and str. Chistopolskaya, Bus stop: “Chistopolskaya”)

**20 ****November ****2014, ****Simonoff Hall, Floor ****3, ****Building ****№ 8. ****Chaired by prof. A. Lvovsky, prof. S. A. Moiseev**

- 00-9.20. (invited)
**Z. Qin, A. S. Prasad, T. Brannan,****A. MacRae, A. Lezama and**(Institute for Quantum Information Science, University of Calgary). A complete measurement of the photons’ waveform.__A. I. Lvovsky__ - 20-9.40 (invited)
**Ali A. Kamli**(Department of Physics, Jazan University, Jazan, Saudi Arabia). De-excitation of dipole emitters in finite ordered charge-sheet structures. - 40-10.00. (invited)
**Chun Xiao Zhou, Xing Yu Xu, and**(College of Physics, Jilin University, People’s Republic of China). Coherence transfer controlled by laser phase under dipole-dipole interaction in a two-atom-cavity system.__Xue Mei Su__ - 00-10.20. (invited)
__Yu. I. Bogdanov__,^{1}‘^{2}‘^{3}**N.****A. Bogdanova**(‘institute of Physics and Technology, Russian Academy of Sciences,^{2}^{2}National Research University of Electronic Technology MIET,^{3}National Research Nuclear University ‘МЕРНГ). The study of Lorenz and Rossler strange attractors by means of quantum theory. **20-10.40.****(invited) D. V. Kupriyanov****(****Санкт****–****Петербургский****государственный****политехнический****университет****)****Coherent control of light transport and quantum interface in dense atomic systems.**- 40-11.00. (invited)
**Xiao Yuan, Zhu Cao,**(Center for Quantum Information, Institute for Interdisciplinary Information Sciences, Tsinghua University, Beijing, China). Input randomness in the clauser-horne-shimony-holt inequality.__Xiongfeng Ma__

**11.00-11.30 ****Coffee Break**

- 30-11.50. (invited)
__I. I. Ryabtsev__, V. L. Kurochkin^{1}‘^{2}‘^{3}^{1}‘^{2}, A. V. Zverev^{1}, and I. G. Neizvestny^{1}^{1}Rzhanov Institute of Semiconductor Physics,^{2}Novosibirsk State University,^{3}Russian Quantum Center, Skolkovo). Experimental quantum cryptography with single photons. - 50-12.10. (invited)
__I. I. Ryabtsev__, I. I. Beterov^{1}‘^{2}‘^{3}^{1}‘^{2}, D. B. Tretyakov^{1},**E. A.****Yakshina**(^{1,2,3}, V. M. Entin^{1}^{1}Rzhanov Institute of Semiconductor Physics,^{2}Novosibirsk State University, Russian Quantum Center, Skolkovo). Quantum information processing with cold Rydberg atoms. - 10-12.30. (invited)
__S.____N.__S.__Andrianov__^{1,2,3},**A. Moiseev**(^{2,3}^{1}Institute for Informatics of ANRT,^{2}Kazan Quantum Center of KNRTU,^{3}E.K. Zavoisky Kazan Physical- Technical Institute of the Russian Academy of Sciences) Nanophotonic quantum computer.

- 30-12.45
**I.****A. Fedorov, A. E. Ulanov,**__Y. V. Kurochkin__^{1}, and**A**.**I. Lvovsky**

(^{1}Russian Quantum Center. Moscow, Russia). Nonlocal action of the photon annihilation operator.

- 12.45 – 13.00
**Yu. I. Bogdanov**^{1}‘^{2}‘^{3},**В****.****I. Bantysh**(^{1}‘^{2}, V. F. Lukichev^{1}, A. A. Orlikovsky^{1}, I. A. Semenihin^{1}, D. V. Fastovets^{1}‘^{2}, A. S. Holevo^{4},__A. Yu. Chernyavskiy__^{1}‘^{5}^{1}Institute of Physics and Technology, Russian Academy of Sciences,^{2}National Research University of Electronic Technology MIET,^{3}National Research Nuclear University ‘MEPHI’,^{4}Steklov Mathematical Institute, Russian Academy of Sciences,^{5}Faculty of Computational Mathematics and Cybernetics, Moscow State University). Modeling of noisy quantum circuits.

**Lunch ****13.00 -14.00**

**Chaired by prof. Yu. I. Bogdanov and prof. I. I. Ryabtsev**

- 00-14.20. (invited)
__Farid Ablayev__, Marat Ablayev - 20-14.40. (invited)
__Alexey Kalachev__‘^{1}^{2,3}, Xiwen Zhang^{3}, and Olga Kocharovskaya^{3}^{1}Zavoisky Physical-Technical Institute,^{2}Kazan Federal University, institute for Quantum Studies and Department of Physics, Texas A&M University, College Station). Solid-state Raman quantum memories for light based on control field angular and frequency modulation. - 40-14.55
**A. V. Vasiliev**(Kazan Federal University. Russia). Mathematical model of quantum communication device for quantum hashing. - 55-15.10.
__N.____M. Arslanov__^{1}**, S.A. Moiseev**(^{1}‘^{2}, Ali A.Kamli^{3}^{1}Kazan Quantum Center, Kazan National Research Technical University,^{2}Kazan Physical-Technical Institute of the Russian Academy of Sciences,^{3}Department of Physics Jazan University Jazan, Saudi Arabia). Low-loss surface plasmon polariton modes in nanoscale planar waveguide. - 10-15.25
**Yu. I. Bogdanov**^{1}‘^{2}‘^{3},__В____.____I. Bantysh__^{1}**‘**(^{2}, V. F. Lukichev^{1}, A. A. Orlikovsky^{1}^{1}Institute of Physics and Technology, Russian Academy of Sciences,^{2}National Research University of Electronic Technology MIET,^{3}National Research Nuclear University ‘MEPHI’) Effect of the spectral degree of freedom of a quantum polarizing state on the quality of optical information technologies.

**15.25-16.00 ****Coffee Break**

- 00-16.15
**V. L. Ermakov**(Kazan State Power Engineering University. Russia). Realization of short-term memory based on nuclear magnetic resonance. - 15-16.30
**Yu. I. Bogdanov**(^{1}‘^{2}‘^{3},__G. V. Avosopyants__^{2}^{1}Institute of Physics and Technology, Russian Academy of Sciences,^{2}National Research University of Electronic Technology MIET,^{3}National Research Nuclear University ‘MEPFII’). Application of the root approach to optical quantum state tomography. - 30-16.45.
__К____.____I. Gerasimov__^{1}‘^{2}**, S. A. Moiseev**(^{1}‘^{2}, V. I. Morosov^{3}, and R. B. Zaripov^{1}^{1}E. K. Zavoisky Kazan Physical-Technical Institute of the Russian Academy of Sciences,^{2}Kazan Quantum Center, Kazan National Research Technical University,^{3}A. E. Arbuzov Institute of Organic and Physical Chemistry Russian Academy of Sciences). Room temperature spin echo memory on high finesse spin frequency comb.

**16.45-17.00 ****Closing of the conference**

**17.00 -19.00 ****Bus tour “Evening Kazan”**