Vortex qubit based on an annular Josephson junction containing a microshort

We report theoretical and experimental work on the development of a vortex qubit based on a microshort in an annular Josephson junction. The microshort creates a potential barrier for the vortex, which produces a double-well potential under the application of an in-plane magnetic field; The field strength tunes the barrier height. A one-dimensional model for this system is presented, from which we calculate the vortex depinning current and attempt frequency as well as the interwell coupling. Implementation of an effective microshort is achieved via a section of insulating barrier that is locally wider in the junction plane. Using a junction with this geometry we demonstrate classical state preparation and readout. The vortex is prepared in a given potential well by sending a series of "shaker" bias current pulses through the junction. Readout is accomplished by measuring the vortex depinning current.Comment: Submitted to Physical Review B (13 pages, 10 figures). Changed content to include more explanatio

Is a single photon's wave front observable?

The ultimate goal and the theoretical limit of weak signal detection is the ability to detect a single photon against a noisy background. [...] In this paper we show, that a combination of a quantum metamaterial (QMM)-based sensor matrix and quantum non-demolition (QND) readout of its quantum state allows, in principle, to detect a single photon in several points, i.e., to observe its wave front. Actually, there are a few possible ways of doing this, with at least one within the reach of current experimental techniques for the microwave range. The ability to resolve the quantum-limited signal from a remote source against a much stronger local noise would bring significant advantages to such diverse fields of activity as, e.g., microwave astronomy and missile defence. The key components of the proposed method are 1) the entangling interaction of the incoming photon with the QMM sensor array, which produces the spatially correlated quantum state of the latter, and 2) the QND readout of the collective observable (e.g., total magnetic moment), which characterizes this quantum state. The effects of local noise (e.g., fluctuations affecting the elements of the matrix) will be suppressed relative to the signal from the spatially coherent field of (even) a single photon.Comment: 13 pages, 4 figure

Using data of optic sensors and pigment content in leaves for efficient diagnostics of nitrogen nutrition

Received: February 23rd, 2022 ; Accepted: May 16th, 2022 ; Published: August 12th, 2022 ; Correspondence: [email protected] monitoring and diagnostics of a condition of crops permit to make prompt and proper activities on dressing nitrogen fertilizers. This will allow the plants to use the nitrogen applied efficiently, and therefore reduce their use in field. Since nitrogen that has not been utilized by plants is able to escape into the atmosphere or be washed out of the soil with water. The most accurate diagnostic method is to determine the chemical composition of plants, but it takes quite a long time and requires laboratory conditions, which is not always possible in the field. One of the promising methods is photometric diagnostics of crops using optical instruments. Experiment is carried out in contrasting weather conditions, on soddy-podzolic soil with spring barley and spring rapeseed being investigated. Results of research show the efficiency of using optic sensors (N-testers) for efficient diagnostics of nitrogen nutrition of plants. The readings of the device (N-tester) were compared with the concentration of a and b chlorophyll, determined by a chemical method. Results of diagnostics with portable photometric device ‘Yara’ are correlating with concentrations of chlorophylls a (r=0.96) and b (r = 0.91) in spring rapeseed. Moreover, correlation of rapeseed yield and concentrations of chlorophylls a and b has quantity and inverse relation similar to device indication (r = -0.81 and r = -0.70 respectively). Results of diagnostics with N-tester ‘Spectroluxe’ are strongly correlating with chlorophyll concentration. Device indication correlates stronger with chlorophyll b concentration in spring barley and chlorophyll a concentration in spring rapeseed (rapeseed was investigated in dryer conditions). Thus, such a modern optical device as N-tester, whose action is based on measuring the concentration of leafy chlorophyll, can replace chemical methods and increase the efficiency of nitrogen fertilization, which means increasing the productivity of plants and reducing the negative impact of unreasonable use of nitrogen fertilizers

Surface Plasma Waves Across the Layers of Intrinsic Josephson Junctions

We predict surface electromagnetic waves propagating across the layers of intrinsic Josephson junctions. We find the spectrum of the surface waves and study the distribution of the electromagnetic field inside and outside the superconductor. The profile of the amplitude oscillations of the electric field component of such waves is peculiar: initially, it increases toward the center of the superconductor and, after reaching a crossover point, decreases exponentially.Comment: 11 pages, 5 figure

Vortex qubit based on an annular Josephson junction containing a microshort

We report theoretical and experimental work on the development of a vortex qubit based on a microshort in an annular Josephson junction. The microshort creates a potential barrier for the vortex, which produces a double-well potential under the application of an in-plane magnetic field; the field strength tunes the barrier height. A one-dimensional model for this system is presented, from which we calculate the vortex-depinning current and attempt frequency as well as the interwell coupling. Implementation of an effective microshort is achieved via a section of insulating barrier that is locally wider in the junction plane. Using a junction with this geometry we demonstrate classical state preparation and readout. The vortex is prepared in a given potential well by sending a series of “shaker” bias-current pulses through the junction. Readout is accomplished by measuring the vortex-depinning current

Prevention of the Infectious Disease Dissemination in Temporal Accommodation Sites during the Large-Scale Flood in the Amur Region

Abnormal rainfall flooding in the Amur Region formed premises for aggravation of epidemiological situation on acute enteric infections. Despite the organized strict control over compliance with applicable sanitary-epidemiological regulations at the temporal accommodation sites, a cluste of enterovirus infection occurred in one of them. On-time performed anti-epidemic measures made it possible to avoid distribution of the infection among the evacuated population and its dissemination outside the territory of that temporal accommodation site. Displayed are the data on operational experience of the Rospotrebnadzor institutions in the Amur Region in managing prophylactic and anti-epidemic activities aimed at the prevention of occurrence and distribution of the infectious diseases among the population evacuated from areas exposed to flood and placed in temporal accommodation sites

Experience in Providing Medical Assistance to the Population of the Amur Region Exposed to the Effects of the Flood

Medical assistance to individuals residing in the flooded areas of the region was delivered on a priority basis throughout the health care institutions on the territorial-division principle, at the temporal accommodation sites, further on - long-term stay centers, 24-hours a day. Determined was the amount of means for specific prophylaxis, immunized was the contingent under risk, stocked up were pharmaceutical preparations, medical products and consumables. Therewith, carried out therapeutic, medical-preventive operations turned out to be on-time and sufficient for providing essential complex of medical assistance to the exposed population in the devastated areas

The quality of life of patients with ovarian cancer stage I-III via general questionnaire EQ-5D and the special questionnaire EORTC QLQ-C30

In order to assess the impact of treatment on quality of life of patients with ovarian cancer stage I-III, we have conducted monitoring of 51 patients who were treated in The Primorsky Krai Oncological Clinic from 2014 to 2015, who responded to the overall EQ-5D questionnaire and the special questionnaire EORTC QLQ-C30 before treatment and after 6 cycles of chemotherapy. All patients were subjected to the surgery at the first stage. Laparotomia, hysterectomy with appendages, resection of the greater omentum is made for 41 (80,4%) patients, without resection of the omentum was made for 3 (5,9%) patients. Laparotomia, uppervaginal amputation of uterus with appendages, resection of the greater omentum is made 5 (9,8%), without resection of the omenntum was made for 2 (3,9%) patients. The omentum was not removed owing to a lack of technical capacity for resection. The second stage of the complex treatment is adjuvant chemotherapy scheme TCb (Paclitaxel 175 mg/m2 Carboplatin AUC 6) or Paclitaxel 175 mg/m2, Cisplatin 75 mg/m2 (total 6 cycles). Pronounced changes in the quality of life of patients before treatment was owing to the manifestation of the underlying disease, the lack of «expressed concerns» after treatment indicates the effectiveness of anticancer therapy. The increase of «moderate problem» by the components «daily activity», «anxiety and depression», «health condition», compared with how it was a year ago,» indicates the presence of side effects of chemotherapy. The quality of life assessment via special questionnaire EORTC QLQ-C30 before treatment and after chemotherapy in patients with stage I ovarian cancer shows significant changes in indicators in the growth of dyspeptic symptoms, improvement of the emotional background (decrease anxiety and depression, sleep), reduced performance of significant physical activity. At the stage II ovarian cancer after chemotherapy increase in a general weakness, a limitation in the performance of daily activities and significant physical exertion are marked. At the stage III ovarian cancer substantial significant changes are noticed as the growth of dyspeptic symptoms, emotional depression, but also at the performance of daily activities and physical exercise, in spite of this, patients assessed the overall health status over the last week by 6 points, where 7 points is excellent health condition. Results show the decrease of the quality of life, in the background of the special treatment and the stage of disease