A5036635563- Quantum Information and Cryptography
- Quantum optics and atomic interactions
- Photonic and Optical Devices
- Mechanical and Optical Resonators
- Cold Atom Physics and Bose-Einstein Condensates
- Advanced Fiber Laser Technologies
- Atomic and Subatomic Physics Research
- Quantum Mechanics and Applications
- Quantum Computing Algorithms and Architecture
- Neural Networks and Reservoir Computing
- Advanced Photonic Communication Systems
- Antenna Design and Optimization
- Quantum and electron transport phenomena
- Gyrotron and Vacuum Electronics Research
- Orbital Angular Momentum in Optics
- Antenna Design and Analysis
- Microwave Engineering and Waveguides
- Laser-Matter Interactions and Applications
- Photonic Crystals and Applications
- Semiconductor Quantum Structures and Devices
Aalto University
2021-2025
Kazan State Technical University named after A. N. Tupolev
2018-2019
Kazan Federal University
2017-2019
Abstract Critical quantum systems are a promising resource for metrology applications, due to the diverging susceptibility developed in proximity of phase transitions. Here, we assess metrological power parametric Kerr resonators undergoing driven-dissipative We fully characterize Fisher information frequency estimation, and Helstrom bound discrimination. By going beyond asymptotic regime, show that Heisenberg precision can be achieved with experimentally reachable parameters. design...
The detection of microwave fields at single-photon power levels is a much-sought-after technology, with practical applications in nanoelectronics and quantum information science. Here we demonstrate simple yet powerful criticality-enhanced method photon by operating magnetic-field-tunable Kerr Josephson parametric amplifier the border first-order phase transition close to critical point. We obtain an efficiency 73% dark-count rate 167 kHz, corresponding responsivity <a:math...
Generation of quantum resources like entanglement is pivotal for technology. This work uses superconducting Josephson metamaterials to generate color-entangled photons from vacuum fluctuations at a high rate, showing the presented system be superb microwave generator with remarkable bandwidth. Successful squeezing light also demonstrated. These results are quite promising computing, sensing, and communication devices.
In this paper we experimentally demonstrated a broadband microwave scheme suitable for the multiresonator quan- tum memory-interface. The consists of system composed mini-resonators strongly inter- acting with common resonator coupled external waveguide. We have implemented controllable tuning mini-resonator frequencies and coupling waveguide implementation impedance matched quantum storage. storage pulses an efficiency 16.3% has been shown at room temperature. possible properties proposed...
In this paper we present universal broadband multiresonator quantum memory based on the spatial-frequency combs of microresonators coupled with a common waveguide. We find Bragg-type impedance matching condition for coupling waveguide field that provides an efficient storage. The analytical solution obtained microresonator fields enables sustainable parametric control all characteristics. also construct experimental prototype studied in microwave spectral range demonstrates basic properties...
Abstract Quantum correlations are a vital resource in advanced information processing based on quantum phenomena. Remarkably, the vacuum state of field may act as key element for generation multipartite entanglement. In this work, genuine tripartite entangled and its control is achieved by use phase difference between two continuous pump tones. Control subspaces covariance matrix bisqueezed demonstrated. Furthermore, optimizing relationships three‐tone pumping scheme quadripartite...
Four-wave mixing (FWM) of ultrashort laser pulses in a highly nonlinear photonic-crystal fiber is shown to provide multimodal source broadband quantum states light. In the regime low pump powers, generation two-photon and heralded single photons with bandwidth up ≈6 THz demonstrated within an FWM-sideband tunability range ≈55 THz. modality single-photon generation, three-detector measurements conditional second-order correlation function reveal strong antibunching signal-photon channel, more...
The detection of microwave fields at single-photon power levels is a much sought-after technology, with practical applications in nanoelectronics and quantum information science. Here we demonstrate simple yet powerful criticality-enhanced method photon by operating magnetic-field tunable Kerr Josephson parametric amplifier near first-order phase transition. We obtain 73% efficiency dark-count rate 167 kHz, corresponding to responsivity $1.3 \times 10^{17}~\mathrm{W}^{-1}$ noise-equivalent...
We study spectral properties of a cascaded multiresonator microwave quantum memory integrated into waveguide-resonator system. On the basis experimental data, we reconstruct internal parameters circuit under study, give estimates efficiency, and show possibility achieving optimal conditions for its realization.
We demonstrate a fiber-optic source of random numbers in which random-number generation (RNG) is implemented via an inherently quantum process—detection correlated photon pairs produced by spontaneous four-wave mixing (FWM) inside optical fiber. The detection times individual pairs, generated our RNG scheme phase-matched FWM highly nonlinear photonic-crystal fiber with suitable dispersion profile, are converted into megabit-size binary sequences, serving as strings numbers. randomness these...
We consider a protocol of broadband quantum memory on controlled frequency comb spectral lines ring microwave resonators connected to common strip waveguide. A prototype this is manufactured, which the room-temperature preservation pulses with an efficiency about 3 % demonstrated. The experimentally obtained can be enhanced level above 90 using modern technologies and conducting experiments at helium temperatures, opens new way for development integrated memory.
Quantum correlations are an essential resource in advanced information processing based on quantum phenomena. Remarkably, the vacuum state of a field may act as key element for generation strong correlations. Besides, superconducting microwave cavities offer excellent platform experimental studies such effects. In this work, we numerically investigate flux-tunable cavity under multiple pump tones. We consider double and triple pumping cases explore pairwise between three frequency bands...
Entangled microwave photons form a fundamental resource for quantum information processing and sensing with continuous variables. We use low-loss Josephson metamaterial comprising superconducting, non-linear, asymmetric inductive elements to generate frequency-entangled from vacuum fluctuations at rate of 2 giga entangled bits per second spanning over 4 GHz bandwidth. The device is operated as traveling wave parametric amplifier under Kerr-relieving biasing conditions. Furthermore, we...
In quantum illumination (QI) the non-classical correlations between continuous variable (CV) entangled modes of radiation are exploited to detect presence a target embedded in thermal noise. The extreme environment where QI outperforms its optimal classical counterpart suggests that applications microwave domain would benefit most from this new sensing paradigm. However all proposed receivers rely on ideal photon counters or detectors, which not currently feasible domain. Here we propose...
In <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">quantum illumination</i> (QI) the non-classical correlations between xmlns:xlink="http://www.w3.org/1999/xlink">continuous variable</i> (CV) entangled modes of radiation are exploited to detect presence a target embedded in thermal noise. The extreme environment where QI outperforms its optimal classical counterpart suggests that applications microwave domain would benefit most from this new...
Paper presents results of calculation, electromagnetic modelling and measurements manufactured antenna system on planar Yagi-Uda elements microstrip coupler. System has summary subtract modes. Center frequency is 1532 MHz with 96 bandwidth. Gain 8 dB in main lobe direction (in-phase mode) 5 (antiphase mode).
Quantum correlations are a vital resource in advanced information processing based on quantum phenomena. Remarkably, the vacuum state of field may act as key element for generation multipartite entanglement. In this work, we achieve genuine tripartite entangled and its control by use phase difference between two continuous pump tones. We demonstrate subspaces covariance matrix bisqueezed state. Furthermore, optimizing relationships three-tone pumping scheme explore quadripartite entanglement...