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.
(c) Mohsen Akbari
President of Tatarstan republic has visited Kazan quantum center to see the demonstration of multi-node quantum network, first ever built in Russia.
Colleagues from the Laboratory of quantum cryptography have successfully demonstrated the functionality of the network to Rustam Minnikhanov. President has also visited other laboratories and found out about recent achievements of Kazan quantum center, such as successful realization of 13% efficiency revival of silenced echo quantum memory.
See the follow up interview of Proff. Sergey Moiseev (ru)
We have demonstrated a combination of frequency comb spin-echo protocol in a conventional microwave pulsed electron spin resonance spectrometer with gradient pulses of the external magnetic field applied for on-demand retrieval of signal microwave pulses at the required moments of time. A natural high-finesse periodic structure was used as a carrier of stored information. The structure is made out of hyperfine lines of electron spin resonance of tetracyanoethylene anion radicals in toluene at room temperature. Herein, we have also observed that using the pulses of gradient magnetic field can increase the memory capacity. The experimental results demonstrated promising opportunities for controlling electron nuclear spin coherence, which could be useful for implementation of broadband microwave or optical-microwave noise free quantum memory protocols.
https://link.springer.com/article/10.1007/s00723-017-0892-y
The main advantage of quantum communications is their absolute protection from channel eavesdropping. Single photons that serve as information carriers in optical quantum communications are changed irreversibly after any attempt of signal interception allowing user to know about any unauthorized listeners. Quantum communication technologies serve as a basis for the future network security and will be integrated into Internet of Things concept that will radically change the everyday technological life. That is why quantum technology is being developed by many leading scientists all over the world. The most significant quantum networks are already built in USA (DARPA), Europe (SEQOQC), Japan (Toshiba) and China.
(с) Photo: ITMO University
Pilot segment of Kazan quantum network connecting two of the four existing nodes was tested in August 2016; now the communication between all four nodes is fully functional. It utilizes the new communication protocol that has been optimized for the city network. The network is realized in the active optical fiber lines of the “Tattelecom” provider. Two of the nodes were located in the commutation stations of “Tattelecom” on the different banks of Kazanka river and the other two in the KNIRTU-KAI buildings. The nodes were 10 km from one another while the optical cable length between the nodes reached 30-40 km during the testing stage.
During the network launch the control sequences and the demo files as well as the audio data in the quantum telephone regime has been transmitted. The basis for that is side-bands quantum communication technology that during testing showed qubit transmission speed over 100 kbit/s across some network regions.
This project creates the basis for the national quantum communications infrastructure development. The technology is to lay ground for the new generation of the distributed secure networks: previously the network providers only provided the data delivery but now they will be able to also provide secure data transmission services, forming the multi-user trusted network. That will be achieved with the help of the scaling of our solution and development of the new standards in the field of quantum communications, – explains the chief of laboratory of quantum informatics of international institute of photonics and optoinformatics ITMO University and the Laboratory of quantum cryptography of Kazan quantum center Arthur Gleym. – Further development of Kazan network lies in two directions: firstly the improvement of the channel characteristics (e.g. speed, range) and secondly integration with other services starting with data processing centers and systems responsible for uninterrupted operation of the city economy and up to mobile communications for example messengers.
Arthur Viktorovich Gleym(с) Photo: ITMO University
Our collaboration with the ITMO is based on shared scientific interests and is very fortunate – comments the head of Kazan quantum center KNIRTU-KAI Sergey Moiseev. – The original scheme of quantum key distribution was created in Saint-Petersburg and we are helping to develop it. The laboratory KNIRTU-KAI has been working on quantum memory for more than 15 years, but our developments needed to have a practical implementation and our colleagues from ITMO needed quantum memory for the long-distance quantum communications. For more than two years now we successfully cooperate. In future we plan to create a quantum repeater (the signal amplifier that stores the quantum state and then transmits it through the channel, it allows one to increase the possible communication distance) and certify the network. Every day we conduct technical trials, develop the network, improve routing and stabilize the equipment.
Moiseev Sergey Andreevich
Previously in Russia only two-node quantum networks were launched in urban conditions. The first one was developed in ITMO University in 2014: the scientists connected the two buildings via optical fiber cable. In the June of 2016 Russian quantum center announced the launch of the next city communication line between the two Gazprom bank buildings and in the September of 2016 MSU announced the launch of quantum communication line connecting two towns in Moscow region. The Kazan project is first to connect the network of several clients – developers say that multi-node network requires principally new approaches and solutions than a point to point systems.
Kazan quantum network is created within the framework of National technological initiative in the direction of SafeNet, that is oriented to the development of new personal safety systems and quantum communications in Russia with the support of Quantum technologies consortium.
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
L.V. Doronina-Amitonova, I.V. Fedotov, A.B. Fedotov, K.V. Anokhin, A.M. Zheltikov
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!
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
Laboratory of photonics and nonlinear fiber optics in collaboration with Alexey Mikhailovich Zheltikov has won a megagrant of Ministry of education and science of Russian Federation with their project “Lightgiude systems for quantum technologies”. There are only two Kazan laboratories among the winners, the second one being a chemistry lab of Kazan federal university.
Any russian college or academy in collaboration with the scientist leading in his field of science could compete for the grant. The fields of science were: natural sciences, technics and technology, medical sciences and sciences of of health, agricultural sciences, social sciences, humanities.
The winners were chosen on the exit session of Soviet for grants which took place during the Second International scientific conference “Science of the future” and Second All-Russian forum “The science of the future – The science of the young” (Kazan). Altogether 542 applications from leading sciences from 45 countries in collaboration with almost 300 scientific and educational institutes of Russia.
Grants of Russian government are given out in the amount not greater than 90 million rubles each for scientific research for 3 years with the ability of extension for another two years.
From 5th to 9th of July “Volga StateUniversity of Technology (Mari State Technical University)” held an XI International scientific school-seminar “Fundamental research and innovation: nanooptics, photonics and coherent spectroscopy”. The conference was held on a picturesque coast of the lake “Yalchik” and gathered around 90 participants from all over the Russia including 40 young researchers and PhD students.
At the conference Kazan quantum center was presented by a series of talks on resent research of the center:
All the talks given at the conference will be published in the digest. Further details can be found on the site of the conference (in russian).
Scientists from Kazan Quantum Center KNRTU-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.
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.
