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...

The paper addresses a problem of creating system for generation and distribution shared secret encryption key based on the physical properties multipath radio propagation. A channel with reciprocal is considered as source randomness, phase passed through environment signal becomes unpredictable. presents results experimental verification feasibility measurements random signal. checking symmetry instances generated exchange cyclic redundancy codes considered. probability bit asymmetry from...

Abstract This paper presents a brief survey on the history of radar observations meteors in Kazan from 1950s to present days. Such achievements researchers as development and further improvement original measuring equipment antenna systems, observational data processing methods, their contribution theory physics meteor phenomena theoretical interpretation experimental are highlighted. A particular progress astronomy has been achieved with new discrete quasi-tomoghraphic method for faint...

The paper presents the results of experimental distribution encryption keys based on random carrier phase fading radio signal measured in a multipath environment. bits extraction scheme was proposed and tested practice. is universal applicable to measurements digitizing any observable variable. Experimental study spatial correlation case transverse diversity carried out. estimation key generation rate probability its passive interception at different distances between legal user potential...

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.

Unmanned aerial vehicles (UAVs) is one of the most fast progressing technologies. High space-time flexibility UAV networks along with ability to payload sensitive measuring equipment allows establishing wireless sensor (AWSNs) new qualities. However, a rapidly reconfigurable phased antenna array system for precise spatially distributed measurements requires high-quality frequency-phase synchronization AWSN drones. Particularly, this paper relates problem designing synchronized centralized...

Unmanned aerial vehicles (UAVs) is one of the most fast progressing technologies. High space-time flexibility UAV networks along with ability to payload sensitive measuring equipment allows establishing wireless sensor (AWSNs) new qualities. However, a rapidly reconfigurable phased antenna array system for precise spatially distributed measurements requires high-quality frequency-phase synchronization AWSN drones. In particular, this paper relates problem designing synchronized centralized...

For radio communication practice it is expedient to establish interrelation of level the signal reflected waves from Es layer at oblique incidence, with values frequency parameters defined vertical sounding (VS) in center a path. There are analytical dependences reflection coefficient value limiting foEs and foE, registered path center, possesses number lacks. Here we investigate behavior experimental on 660 km Moscow-Kazan operating frequencies 5, 10, 15 20 MHz. Established that incidence...

The paper describes the statistical investigation of short-lived traces (look like Es), which was performed using A, H-, and A <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">Σ</sub> -maps. These maps were obtained by ionogram treatment with high time resolution (1 per minute) for 2013-2014. observed results such Es occurrence statistics have a similar variation some meteor showers activity peaks.

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.

Аннотация

In this paper, we discuss the main types of quasiperiodic variations in amplitudes a reflected signal during vertical sounding ionosphere at middle latitudes. The initial experimental data is ionograms obtained by Cyclone ionosonde. ionosonde located Kazan (59°, 49°) and standard mode allows us to receive one ionogram per minute. analysis, methods are used visualize large flow form final summary maps state (A-, H-, As-maps). We give typical examples on A-maps for various multipath beatings...

The paper addresses a problem of creating system for generation and distribution shared secret encryption key based on the physical properties multipath radio propagation. A channel with reciprocal is considered as source randomness, phase passed through environment signal becomes unpredictable. presents general block diagram process. method estimating rate common secrete proposed. An influence parameters considered.