Scientists of KQC will create the first quantum network in Russia

The first quantum network in Russia will be created by the scientists of KNRTU-KAI and ITMO in Kazan in the domain of network provider “Tattelecom”.

Scientists from Kazan Quantum Center KNIRTU-KAI and ITMO university have launched a trial segment of the multinodular quantum network, that is the first such network in the country. This is to be a big step in the development of quantum communications in Russia and will provide the technological basis for the following creation of scalable quantum communication infrastructure.

The article on inzvestia.ru (Russian)

New research by E. S. Moiseev & and S. A. Moiseev

Time-bin quantum RAM

Abstract: We have proposed a compact scheme of quantum random access memory (qRAM) based on the impedancematched multi-qubit photon echo quantum memory incorporated with the control four-level atom in two coupled QED cavities. A set of matching conditions for basic physical parameters of the qRAM scheme that provides an efficient quantum control of the fast single photon storage and readout has been found. In particular, it has been discovered that the efficient qRAM operations are determined by the specific properties of the excited photonic molecule coupling the two QED cavities. Herein, the maximal efficiency of the qRAM is realized when the cooperativity parameter of the photonic molecule equals to unity that can be experimentally achievable. We have also elaborated upon the new quantum address scheme where the multi-time-bin photon state is used for the control of the four-level atom during the readout of the photonic qubits from the quantum memory. The scheme reduces the required number of logical elements to one. Experimental implementation by means of current quantum technologies in the optical and microwave domains
is also discussed.

View at publisher’s website

Authors from Taiwan report 96% efficiency quantum memory

An intriguing manuscript concerning experimental implementation of quantum memory has recently appeared at arxiv.org. The manuscript is titled “EIT-based photonic memory with near-unity storage efficiency” therein group of ten authors claim that they have achieved 96% storage efficiency in cold Cs vapor using EIT protocol. If the results are correct that is a new record in quantum storage and overall an outstanding experimental result!

96percent_setup

Guest talk by Vashurin N. S.

Tomorrow at 12:00 in the conference hall Vashurin N. S. from Volga State Technical University will present his PhD thesis titled

“Femtosecond photon echo via exciton states  in think textured films”

Full length text of the authors PhD thesis could be found in a Lobachevsky Nicolay Scientific Library

President of Tatarstan republic in kazan quantum center

President of Tatarstan republic in kazan quantum center

Rustam Minnikhanov, the president of the Tatarstan republic has visited Kazan Quantum Center, as part of the open meeting for young innovators, inventors and rationalizers of Russia. Sergey Moiseev has shown him around the laboratories and told him about recent activities, successes and future plans of the center.

Президент республики Татарстан, Рустам Минниханов в лаборатории квантовой криптографии.

President Minnikhanov in the Quantum Cryptography lab.

Р. Минниханов в лаборатории квантовой криптографии

R. Minnikhanov in QC lab.

“Applied electrodynamics, photonics and living systems-2016”

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.

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

Report of M.R. Mohebbifar

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

Kazan Federal University

The date and time will be announced soon.

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
well.

[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.

 

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