Demonstration of Universal Parametric Entangling Gates on a Multi-Qubit Lattice

We show that parametric coupling techniques can be used to generate selective entangling interactions for multi-qubit processors. By inducing coherent population exchange between adjacent qubits under frequency modulation, we implement a universal gateset for a linear array of four superconducting qubits. An average process fidelity of $\mathcal{F}=93\%$ is estimated for three two-qubit gates via quantum process tomography. We establish the suitability of these techniques for computation by preparing a four-qubit maximally entangled state and comparing the estimated state fidelity against the expected performance of the individual entangling gates. In addition, we prepare an eight-qubit register in all possible bitstring permutations and monitor the fidelity of a two-qubit gate across one pair of these qubits. Across all such permutations, an average fidelity of $\mathcal{F}=91.6\pm2.6\%$ is observed. These results thus offer a path to a scalable architecture with high selectivity and low crosstalk

Non Linear Correlation between Statistically Sensitive Ultrasonic Features and the Strength of Composite Adhesive Joints

The motivation for the increasing use of fiber-reinforced materials as structural components in the aeronautical and automobile industries is their improved strength to weight ratio. The most widely used technique for the joining of composite components is adhesive bonding. However, the use of bonded composite joints has been hampered by the lack of a reliable nondestructive testing (NDT) technique for the evaluation of the interfacial condition of the joints, which has an essential role in establishing the joint strength

Analysis results of surgical treatment and chemoradiotherapy with assessment of prognostic factors in localy advanced laryngeal cancer

The study objective – to analyze the treatment results and prognostic factors of survival in patients with locally advanced laryngeal cancer who received surgical treatment and chemoradiotherapy.Materials and methods. The retrospective study included patients with locally advanced laryngeal cancer treated at the N. N. Petrov National medical Research Center of Oncology, Ministry of Health of Russia in the period from 2009 to 2018. The patients included in the study were divided into 2 equal groups (74 patients were included in each group) depending of treatment: surgery with postoperative radiation therapy combined with chemotherapy (group 1) and concurrent chemoradiation therapy and subsequent surgical treatment in case of incomplete response to treatment or disease progression (group 2). The endpoints of the study were general and relapse-free survival.Results. One hundred and forty-eight patients were included in the study: 74 patients in group 1 and 74 patients in the group 2. The median overall survival in the surgical treatment group was 45 months, in the chemoradiotherapy group – 44.6 months, and the overall 5-year survival for the group 1 and the group 2 were 39.3 (95 % confidence interval (CI) 26.1–59.2), and 59.2 % (95 % CI 45.3–77.2), respectively. The relapse-free 5-year survival rate for the surgical treatment group and the chemoradiotherapy group was 36.8 (95 % CI 25.1–53.8), and 53.9 % (95 % CI 40.7–71.4), respectively.Conclusion. There were no significant differences in overall and relapse-free survival. Metastatic lesion of the neck lymph nodes (N2–3), invasion of laryngeal cartilage, invasion of the thyroid gland and the spread of the tumor to the larynx are statistically significantly associated with lower overall and relapse-free survival