CSC Young Professionals

Superconductivity Talks Series


Superconductivity Talks is our new virtual webinar series that showcases Young Professionals across different superconductivity disciplines.  Selected Young Professionals will give virtual talks to the superconductivity community about their research and interests.  This webinar series is a great way to learn about other YP research, network with other professionals within and across different superconductivity fields, and also get experience presenting!

Our first talks series encompassed fantastic talks from some of our YP members. We’ve had talks on “Boosting Superconducting Electronics with the Josephson Effect”, “Scaling Laws for Ion Irradiation Experiments in Iron-Based Superconductors (IBS)” and “Design & Modeling of a Non-Planar REBCO Coil for Stellarators”.


Upcoming Superconductivity Talk

Speaker: Ahmedullah Aziz

Date: 19 July 2024

Time: 10:00 AM EDT (UTC -4:00)

Title: Computing at the Ultra-Cold: Exploring the Frontiers of Cryogenic Electronics

Abstract: 

Cryogenic (Cryo) logic and memory technologies have been rapidly garnering interest in recent years due to their immense prospect as potential enablers for multiple exciting technology platforms, including - quantum computing, high performance computing (HPC), and space electronics. The use of ultra-cold (~milli Kelvin) superconducting (SC) qubits is customary in most of the cutting-edge quantum computing systems in existence. The quantum core is accompanied by two other crucial components - a classical control processor and a memory block. 

Currently, these classical components are kept at room temperature and are interfaced with the quantum substrate through low-density dissipative interconnects. The resulting large thermal gradient adds extra noise to this sensitive system, which already strives to suppress interferences. To realize a practical quantum computing system (comprising thousands of qubits), it is necessary to keep all relevant components (qubits, control processor, interconnects, and the memory block) in a cryogenic environment. That makes an easy case for specialized cryogenic logic and memory. Even with the advent of the quantum computing era, ultra-fast and energy-efficient classical computing systems are still in high demand. With the rapidly increasing energy demand in data centers and supercomputing facilities, cryogenic logic/memory systems have emerged as promising alternatives to conventional platforms. Superconducting electronics (SCE) has the potential to revolutionize HPC systems, thanks to the ultra-high speed (~100s of GHz) and extreme energy efficiency (atto-Joule/operation) of the SC devices. To fully leverage the capabilities of SC processors, it is necessary to pair them with suitable cryo memory blocks.

Finally, cryo logic/memory are critically important and natural fit for space applications. Due to such immense prospects, a multitude of technologies have already been explored to find suitable candidates for cryogenic data processing and storage. This presentation provides a brief overview of the existing and emerging variants of cryogenic computing primitives. The discussion also includes the challenges associated with these technologies and their unique prospects. A special emphasis will be placed on some of our recent works on superconducting logic, memory, and logic-in-memory platforms.

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February 10 | 17:00 CET

Boosting Superconducting Electronics with the Josephson Effect

This is the first recording of the Superconductivity Talks webinar series hosted by the Young Professionals committee of the IEEE Council of Superconductivity. Dr. Halima Ahmad will speak about her research with superconducting quantum circuits.

Since its first discovery in the early ‘60s, the Josephson effect has been a powerful tool to study the fundamental physics occurring in conventional and unconventional superconducting materials and the exotic phenomena arising when coupling superconductors with barriers far from simple insulators or metals [1]. However, Josephson junctions are not just a laboratory platform. The research community has already demonstrated that they can enhance the capabilities of superconducting electronics in real-world applications: from highly sensitive magnetometry to quantum metrology and from quantum detection to quantum computation [2]. In this talk, we will specifically focus on the possibility of building a hybrid classical/quantum superconducting platform for high-performance computing by exploiting unconventional Josephson junctions that use ferromagnetic tunnel barriers (tunnel-SFS JJs) [3-7]. Tunnel SFS JJs have the potential of enlarging the capabilities of current state-of-the-art superconducting electronics [8-12]. The high quality of tunnel JJs adds to the chance to tune the magnetization of the ferromagnetic barrier. We show that this allows setting up a convenient playground for novel control, read-out, and memorization mechanisms. [1] A. Barone and G. Paternò, John Wiley & Sons, Inc. 9780471014690 (1982). [2] F. Tafuri, Vol. 286. Springer Nature, (2019). [3] K. Senapati, et al., Nature Materials, 849 (2011). [4] A. Pal, et al., Nature Communications, 3340 (2014). [5] R. Caruso, et al., Phys. Rev. Lett. 122, 047002 (2019). [6] R. Satariano, et al., Phys. Rev. B 103, 224521 (2020). [7] Ahmad, H. G., et al., arXiv preprint arXiv:2106.15646 (2021). [8] D. Massarotti, et al., Nature Communications, 7376 (2015). [9] H.G. Ahmad, et al., Phys. Rev. Applied 13, 014017 (2020). [10] R. Caruso, et al., Journal of Applied Physics, 123 (2018). [11] Loredana Parlato, et al., Journal of Applied Physics 127, 193901 (2020). [12] H.G. Ahmad et al., submitted paper (2021).

Dr Halima Ahmad

University of Napoli Federico II
Italy
May 22

Scaling Laws for Ion Irradiation Experiments in Iron-Based Superconductors (IBS)

This is the second recording of the Superconductivity Talks webinar series hosted by the Young Professionals committee of the IEEE Council of Superconductivity. Daniele Torsello speaks about his research regarding ion irradiation of Iron-Based Superconductors (IBS).

Ion irradiation is a useful tool to introduce disorder in materials, and hence engineer their properties. In superconductors the increased disorder enhances carrier scattering, decreasing the critical temperature, and provides pinning centers, increasing the critical current.

However, virtually infinite combinations of ions and energies exist, making it difficult to choose the best conditions for a desired outcome. We investigated how the properties of a large set of Iron-based superconductors of the 122 family are modified by ion irradiation with different beams and energies.

From this broad and comprehensive set of experimental data, clear scaling laws emerge, valid in the range of moderate disorder, providing a useful rule-of-thumb to design irradiation experiments.

Daniele Torsello

Politecnico di Torino
Italy
September 21 | 19:00 CET

Design & Modeling of a Non-Planar REBCO Coil for Stellarators

The long understood benefits of operating fusion devices, such as tokamaks and stellarators, at high fields make superconducting magnets necessary to realize a compact fusion power system. Superconducting stellarators, such as W7-X, have used standard low-temperature superconductor technology (NbTi). ARPA-E has recently funded a 2-year project led by the startup Type One Energy and involving the Fusion Technology Institute at the University of Wisconsin–Madison and the Plasma Science and Fusion Center at MIT, to design and manufacture the first non-planar HTS (REBCO) coil based on the SPARC tokamak’s VIPER cable concept for a high-field stellarator. The design consists of a two-turn non-planar HTS coil supported by a pair of 3D printed stainless steel radial plates. The ultimate goals of the project are to determine if commercial REBCO tapes and additive manufacturing can be used to fabricate high field (>10 T) non-planar coils with tight bending radii (100 mm) and without degradation of the superconducting performance. In this presentation we will report on the fabrication of a two-turn non-planar HTS coil with tight-radius bends that will be supported by a pair of 3D printed stainless steel radial plates. A critical risk that is still to be retired is the accurate 3D bending of a multi-turn coil so that it mates properly with the radial plates, and produces the desired 3D B-field structure. Testing of the completed coil at 77 K will characterize the Ic, the 3D B-field structure, and the quench robustness, and will be compared to detailed electromagnetic, mechanical, and thermal modeling.

Nicolò Riva

Karlsruhe Institute of Technology/EPFL
Germany
8 (Africa, Europe, Middle East)