Instabilities near ultrastrong coupling in microwave optomechanical cavity

With artificially engineered systems, it is now possible to realize the coherent interaction rate, which can become comparable to the mode frequencies, a regime known as ultrastrong coupling (USC). We experimentally realize a cavity-electromechanical device using a superconducting waveguide cavity and a mechanical resonator. In the presence of a strong pump, the mechanical-polaritons splitting can nearly reach 81% of the mechanical frequency, overwhelming all the dissipation rates. Approaching the USC limit, the steady-state response becomes unstable. We systematically measure the boundary of the unstable response while varying the pump parameters. The unstable dynamics display rich phases, such as self-induced oscillations, period-doubling bifurcation, period-tripling oscillations, and ultimately leading to the chaotic behavior. The experimental results and their theoretical modeling suggest the importance of residual nonlinear interaction terms in the weak-dissipative regime.Comment: 7 pages, 4 figures, and supplemental materia

Application of Saptopakram in Vranashopha Management- A Review

Vrana i.e., wound and its management has prime importance in surgical practice. Vranashopha has peculiar clinical features and is rapidly spreading pathological condition. The disease isn’t easy to treat even if a doctor knows its stages very well. So the deep and exact knowledge about the Vranashopha and its stages is must for a good doctor. Acharya Sushruta has mention and explained 7 major procedures (Saptopakram) for Vranashopha management which includes the management at its initial stage (Amavastha) through the wound stage (Vranavastha) till the management of the complications of the healed wound (Vaikritapaham). We can categorized these procedures as the first 3 procedure can be used for Amavastha and Pachyamanavastha both, the 4th for Pakwavastha alone, 5th & 6th for the stage of wound and the 7th for the management of complications of healed wound. The description of Saptopakrama is described for both Aam and Pakvasopha means it included Nija and Agantuja both type of Vrana. In this review article, we have tried to describe different types of Shopha, their Lakshanas (signs & symptoms), and their management according to Susruta Samhita in Ayurveda. There are some efforts have also been carried out to collect, discuss and describe the Ayurvedic concept of Saptopakram

Orthopaedics in Ayurveda - Bhagna Chikitsa- A Review

In the vast literature of Ayurveda, orthopaedic condition is well elaborated in the name of Bhagna Chikitsa. As per the condition Acharya Sushruta described Many of the new techniques are well developed for the management of fracture like as it’s etiology, classification, and various modalities of the management. Bhagna in ancient period were commonly faced problem occurs in war and attack by animal etc. but in the present time these are commonly as a result of Road Traffic Accident (R.T.A.). Acharya Sushruta explained Bhagna depending upon nature of trauma, shape of fracture, displacement of fracture fragment and fracture with or without wound. If it occurs in the bone it is called as Kand Bhagna (bone fracture) and in the joint it is called as Sandhimoksha (dislocation). Acharya Sushruta defined the principle of fracture of fracture management centuries ago are as per condition suggestive conservative or surgical treatment. Conservative modalities includes Kushabandh, Alepa, Chakrayoga, Taila Droni etc are still relevant and used. It would be worthwhile to explore this unique feature for use in present times. The concept, theories and techniques which were practical several thousand years ago hold true even in modern era. Purpose of this article, to re-evaluate the Bhagna

Generation of control signals using second-Nyquist zone technique for superconducting qubit devices

There is growing interest in developing integrated room temperature control electronics for the control and measurement of superconducting devices for quantum computing applications. With the availability of faster DACs, it has become possible to generate microwave signals with amplitude and phase controls directly without requiring any analog mixer. In this report, we use the evaluation kit ZCU111 to generate vector microwave pulses using the second-Nyquist zone technique. We characterize the performance of the signal generation and measure amplitude variation across second Nyquist zone, single-sideband phase noise, and spurious-free dynamic range. We further perform various time-domain measurements to characterize a superconducting transmon qubit and benchmark our results against traditionally used analog mixer setups.Comment: 18 pages, 5 figure