Sasan Razmkhah
Research scholar at Ming Hsieh Electrical Engineering department of University of Southern California under supervision of Prof. Massoud Pedram.
Sasan is an accomplished researcher and lecturer with expertise in cryogenic and superconductor electronics. He earned his B.Sc. in electrical engineering in 2009 and his M.Sc. in 2011 from the Sharif University of Technology in Tehran, Iran, specializing in electrical engineering with a focus on devices and nanotechnology. In 2018, he completed his Ph.D. with a thesis titled "Low Power, High-Speed Computing Using Rapid Single Flux Quantum Circuits." Joining the superconductivity group (Supra) at CNRS IMEP-LaHC laboratory as a postdoctoral researcher in 2018, Sasan contributed to the ColdFlux/SuperTools project. Following this, he served as an Assistant Professor in the Department of Electric and Electronics Engineering at TOBB ETU. Currently, he holds the position of a research scholar in the SPORT-Lab, located within the Ming Hsieh Electrical and Computer Engineering Department (ECE) at the University of Southern California (USC). Sasan's research primarily focuses on superconductivity, covering areas such as low-power digital architectures, integrated circuits, neural networks, superconductor quantum electronics, microwave electronics, and sensors & detectors. His diverse research interests include novel computing architectures, ultra-low power and microwave integrated circuits, quantum computing, and cryogenics. Presently, he is actively engaged in research as part of the NSF-funded Expedition: DISCoVER project.
- Research Experience
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Oct. 2022 - Present: Research scholar at SPORT lab under supervision of Prof. Massoud Pedram
Jan. 2021 - Sep. 2022: Assistant professor at TOBB ETU department of electric and electronics engineering.
May. 2018 - Jan. 2020: Post doctoral researcher at CNRS, IMEP-LAHC laboratories. ColdFlux project
June. 2013 - Feb. 2018: Researcher and teaching assistant at TOBB ETU Prof. Ali Bozbey Superconductor electronics laboratory (SEL)
Dec. 2011 - May 2013: Researcher at Superconductor Electronics Research Laboratory (SERL) at Sharif University of Technology
Sept. 2009 - Nov. 2011: Graduate student and research assistant at Sharif University of technology.
- Publications
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S. Razmkhah, R. S. Aviles, M. Li, S. Gupta, P. A. Beerel ,M. Pedram, “Challenges and Unexplored Frontiers in Electronic Design Automation for Superconducting Digital Logic”, Design Automation and Test in Europe Conference, March 2024.
S. Razmkhah, M. Kamal, N. Yoshikawa, M. Pedram, “Josephson parametric oscillator based Ising machine”, Physical Review B, vol. 109, no. 1, p. 014511, 2024.
S. Razmkhah, A. Bozbey, “Efficient Superconductor Arithmetic Logic Unit for Ultra-Fast Computing”, [Under review], arXiv preprint arXiv:2312.09386, 2023.
S. Razmkhah, M.A. Karamuftuoglu, A. Bozbey, “Hybrid Synaptic Structure for Spiking Neural Network Realization”, [Under review], arXiv preprint arXiv:2311.07787, 2023.
H. Cong, S. Razmkhah, M.A. Karamuftuoglu, M. Pedram, “Superconductor Logic Implementation with All-JJ Inductor-Free Cell Library”, [Under review], arXiv preprint arXiv:2310.13857, 2023.
B.Z. Ucpinar, M.A. Karamuftuoglu, S. Razmkhah, M. Pedram, “An On-Chip Trainable Neuron Circuit for SFQ-Based Spiking Neural Networks”, Accepted IEEE Tran. App. Super. ,arXiv preprint arXiv:2310.07824, 2023.
M.A. Karamuftuoglu, B.Z. Ucpinar, S. Razmkhah, M. Kamal, M. Pedram, “Unsupervised SFQ-Based Spiking Neural Network”, [Under review], arXiv preprint arXiv:2310.03918, 2023.
B. Zeynep Ucpinar, Y. Kopur, M. Altay Karamuftuoglu, S. Razmkhah, M. Pedram, “Design of a Superconducting Multiflux Non-Destructive Readout Memory Unit”, [Under review], arXiv e-prints, arXiv: 2309.14613, 2023.
S. Razmkhah, M. Pedram, “High-Density Superconductive Logic Circuits Utilizing 0 and Josephson Junctions”, [Under review], arXiv preprint arXiv:2308.12474, 2023.
C.J. Fourie, K. Jackman, J. Delport, L. Schindler, T. Hall, P. Febvre, S. Razmkhah, “Results from the coldflux superconductor integrated circuit design tool project”, IEEE Transactions on Applied Superconductivity, vol. 3, 2023.
M.A. Karamuftuoglu, A. Bozbey, S. Razmkhah, “JJ-Soma: Towards a Spiking Neuromorphic Processor Architecture”, IEEE Transactions on Applied Superconductivity, vol. 4, 2023.
S. Razmkhah, A. Bozbey, P. Febvre, “Superconductor modulation circuits for Qubit control at microwave frequencies”, arXiv preprint arXiv:2211.06667, 2022.
A. Akgun, S. Razmkhah, “PySQIF, a statistical analysis tool for bi-SQUID magnetometers”, Journal of Physics: Conference Series, vol. 2323, no. 1, p. 012026, 2022.
S. Razmkhah, A. Bozbey, P. Febvre, “A Compact High Frequency Voltage Amplifier for Superconductor-Semiconductor Logic Interface”, Supercond. Sci. Technol. Vol. 34, no. 4, Feb. 2021.
P. Leroux, C. J. Fourie, S. Razmkhah, P. Febvre, “Accurate small signal simulation of superconductor interconnects in SPICE”, IEEE Transactions on Applied Superconductivity, doi: 10.1109/TASC.2021.3071638.
S. Razmkhah, P. Febvre, “JOINUS: A User-friendly Open-source Software to Simulate Digital Superconductor Circuits”, IEEE Transactions on Applied Superconductivity, vol. 30, no. 5, pp. 1–7, Aug. 2020.
C. J. Fourie, K. Jackman, M. M. Botha, S. Razmkhah, P. Febvre, C. L. Ayala, Q. Xu, N. Yoshikawa, E. Patrick, M. Law, Y. Wang, M. Annavaram, P. Beerel, S. Gupta, S. Nazarian, M. Pedram, “ColdFlux Superconducting EDA and TCAD Tools Project: Overview and Progress", IEEE Transactions on Applied Superconductivity, vol. 29, no. 5, pp. 1–7, Aug. 2019.
M. Tanaka, M. Kozaka, K. Kamiya, K. Usenmez, E. Can Aydogan, S. Razmkhah, A. Bozbey, A. Fujimaki, “SFQ Parallel Encoders Promising for Video Imaging with Superconductor Stripline Detectors”, IEEE Transactions on Applied Superconductivity, vol. 31, no. 1, pp. 1-6, Jan. 2021.
A. Bozbey, E. Can Aydogan, K. Usenmez, S. Razmkhah, M. Tanaka, A. Fujimaki, “Synchronous SFQ Address Encoder for Superconductor Detector Arrays”, IEEE Transactions on Applied Superconductivity, vol. 31, no. 4, pp. 1-5, 2021.
A. Bozbey, M. A. Karamuftuoglu, S. Razmkhah, M. Ozbayoglu “Single Flux Quantum Based Ultrahigh Speed Spiking Neuromorphic Processor Architecture”, IEEE TAS, Under revision.
U. Yilmaz, S. Razmkhah, R. Collot, J. Kunert, R. Stolz, and P. Febvre, “Study of microwave resonances induced by bias lines of shunted Josephson junctions,” IEEE Transactions on Applied Superconductivity, vol. 30, no. 7, pp. 1-5, Oct. 2020.
S. Razmkhah, A. Bozbey, " Heat flux capacity measurement and improvement for the test of superconducting logic circuits in closed-cycle cryostats", Turk J Elec Eng & Comp Sci, vol. 27, no. 5, pp. 3912–3922, Sep. 2019.
S. Razmkhah, A. Bozbey, “Design of passive transmission lines for different stripline widths and impedances" IEEE Transactions on Applied Superconductivity, vol.26, no.8, 2016.
F. Sarreshtedari, S. Razmkhah, N. Hosseini, J. Schubert, M. Banzet and M. Fardmanesh, “An efficient SQUID NDE defect detection algorithm by using an adaptive finite element modeling”, Journal of superconductivity and novel magnetic, vol. 24, no. 1-2, pp.1077-1081, 2011.
S. Razmkhah, M. J. Eshraghi, F. Forooghi, F. Sarreshtedari, and M. Fardmanesh, “Fundamental mode fluxgate magnetometers for active magnetic shielding” in 2011 19th Iranian Conference on Electrical Engineering, 2011, pp. 1–4.
F. Sarreshtedari, S. Razmkhah, M. H. Alavi, and M. Fardmanesh, “RF SQUID electronic readout system for the frequency range of 650MHz to 1GHz with automatic parameter setting” in 2010 18th Iranian Conference on Electrical Engineering, 2010, pp. 442–445.
F. Sarreshtedari, M. Hosseini, S. Razmkhah, K. Mehrany, H. Kokabi, J. Schubert, M. Banzet, H. Krause, M. Fardmanesh, “Analytical Model for the Extraction of Flaw-Induced Current Interactions for SQUID NDE”, IEEE Transactions on Applied Superconductivity, vol.21, no.4, pp. 3442 - 3446, 2011.
Alireza Kokabi, Amirhosein Khoshaman, Sasan Razmkhah, Seyed Mehdi Hoseini, “Response Analysis of Free-membrane Transition-Edge Detectors with thin substrate” Journal of physics, International Conference on Superconductivity and Magnetism (ICSM2008),vol. 153, no. 1, 2009.
- Book Chapter
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- S. Razmkhah, P. Febvre, “Superconducting Quantum Electronics”, Beyond‐CMOS: State of the Art and Trends, pp. 295-391, 2023.
- Organized Workshops and Conferences
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- Organizing committee of “Superconducting for Greener Computing,” at Tapia conference, Sep.2023, Dallas, Texas, USA.
- Organizing committee of “Design and Integration of Superconductive Computation for Ventures beyond Exascale Realization,” at ISCA2023 conference, June 2023, Orlando, Florida, USA.
- Organizing committee of “Summer school about Superconducting Electronics,” Summer School Sep. 2018, Minorca, Spain.
- Organizing team of “International Conference of Superconductivity and Magnetism,” ICSM, April 2016, Fethiye, Turkey.
- Patent Applications
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- S. Razmkhah, A. Bozbey, “A test system for cryogenic super conductive circuit packages", TR201717652A2.
- A. Bozbey, S. Razmkhah,” Threshold adjustable Neuron circuit”, WO2022005430A1, US Patent App. 18/003,391, 2023.
- A. Bozbey, S. Razmkhah,” A soma circuit”, WO2022197276A1.
- A. Bozbey, S. Razmkhah, “An artificial synapse circuit”, WO2021246990A1, US Patent App. 18/000,553, 2023.
- Invited Talks
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- S. Razmkhah, “Progress and future prospective of open-source software development for superconductor circuits”, 34th international symposium on superconductivity, Japan, 2021.
- S. Razmkhah, A. Bozbey, P.Febvre, “SFQ based pulse amplifier for communication in multi-chip superconductor/CMOS circuits”, ICSM2021, Turkey, 2021.
- S. Razmkhah, A. Bozbey, "Demonstration of a Different Single Flux Quantum Logic and Arithmetic Sub-Circuits for Custom Designed Parallel Pipe-line Microprocessor in Cryocooler Environment" SSV2016, Yokohama, Japan, 2016.
- Conferences
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- Alireza Kokabi, Amirhosein Khoshaman, Sasan Razmkhah, Seyed Mehdi Hoseini, “Response Analysis of Free-membrane Transition-Edge Detectors with thin substrate”, ICSM2008 ,Turkey, 2008.
- Farrokh Sarreshtedari, Sasan Razmkhah, Mohammad H. Alavi, and Mehdi Fardmanesh, “RF SQUID electronic readout system for the frequency range of 650MHz to 1GHz with automatic parameter setting”, Iranian Conference on Electrical Engineering (ICEE), 18th ,pp.442-445 , 2010.
- Farrokh Sarreshtedari, Sasan Razmkhah, Nahid Hosseini, Khashayar Mehrany, Hamid Kokabi, Jürgen Schubert, Marko Banzet, Hans-Joachim Krause, Mehdi Fardmanesh, "Model based inverse solution of SQUID NDE using a new numerical model for the extraction of flaw-induced current interactions", Applied Superconductivity Conference (ASC2010), Washington, USA, 2010.
- F. Sarreshtedari, S. Razmkhah, N. Hosseini, J. Schubert, M. Banzet and M. Fardmanesh, “An efficient SQUID NDE defect detection algorithm by using an adaptive finite element modeling”, ICSM2010, Turkey, Antalya, 2010.
- S. Razmkhah, M. J. Eshraghi, F. Sarreshtedari, F. Forooghi, M. Fardmanesh, "Fundamental mode fluxgate magnetometer for active magnetic shielding"(Oral), Iranian Conference on Electrical Engineering (ICEE), 19th, 2011.
- F. Sarreshtedari, S. Razmkhah, M.J.Eshraghi, K.Mehrani, J. Schubert, M. Banzet and M. Fardmanesh, "A novel Eddy current SQUID NDE optimization method for identification of unknown hidden defects", EUCAS2011, Netherlands, Den Haag, 2011.
- F. Sarreshtedari, S. Razmkhah, M.J.Eshraghi, F.Forooghi, M.Fardmanesh, " Development of Two Stage Local Active Shield for High Tc SQUID Based MCG ",ICSM2012, Turkey, Istanbul, 2012.
- S. Razmkhah, A. Bozbey, "Automatic characterization and measurement of custom designed RSFQ chips", ASCAS2013, Capadokia, Turkey, 2013.
- S. Razmkhah, A. Bozbey, "Fully Automated SFQ Chip Measurement Setup for Evaluation of Operating Condition and Bias Margins", SSV2014-YS, Nagoya, Japan, 2014.
- S. Razmkhah, A. Bozbey, " Representation of an 8-bit, 20GHz Pipelined RSFQ ALU as a Coprocessor ", ICSM2014, Turkey, Antalya, 2014.
- S. Razmkhah, A. Bozbey, "Design of narrow passive transmission lines, driver and receiver cells for SFQ circuits ", ISEC2015, Nagoya, Japan, 2015.
- A. Bozbey, D.Balaban, S. Razmkhah, P.Febvre , C.Celik, S.Gaffet, E. Di Borgo, "Magnetic field noise investigation for site selection of a SQUID-based Earth magnetic field recording station ", EUCAS2015, Lyon, France, 2015.
- A. Bozbey, S. Razmkhah, A.Fujimaki, "Implementation of a closed cycle refrigerator test system for superconducting stripline detectors ", EUCAS2015, Lyon, France, 2015.
- S. Razmkhah, A. Bozbey, "Demonstration of a Different Single Flux Quantum Logic and Arithmetic Circuits for Incorporating in Custom Designed Parallel Pipe-line Microprocessor", ICSM2016, Fethiye, Turkey, 2016.
- S. Razmkhah, A. Bozbey, "Design of a Stackable Single-Flux-Quantum Microprocessor with Bit-slicing Architecture in Closed Cycle Cryocooler Environment", ICSM2016, Fethiye, Turkey, 2016.
- M. Eren Çelik, M. Özer, S. Razmkhah, A. Bozbey, "Design and demonstration of large scale RSFQ logic by applying STATS tool for timing variants analysis", ICSM2016, Fethiye, Turkey, 2016.
- A. BOZBEY, D. Balaban, S. Razmkhah, C. Çelik, S. Gaffet, E. Di Borgo, E.F. Saunderson, D.J. Gouws, “Comparison of different magnetic Field noise environments for setting up a SQUID-based magnetometer network", ICSM2016, Fethiye, Turkey, 2016.
- A. Bozbey, K. Usenmez, E.C. Aydogan, S. Razmkhah, A. Fujimaki “Development of the current biased Superconducting Stripline Detector (SSLD) array and its associated address encoder", SSV2017, Nagoya, Japan, 2017.
- A. Bozbey, K. Usenmez, E.C. Aydogan, S. Razmkhah, A. Fujimaki “Development of Current Biased Superconducting Stripline Detectors and Signal Processing Circuits Compatible with Standard SFQ Foundry Processes", Cryogenic Engineering Conference and International Cryogenic Materials Conference, Madison, USA, 2017.
- A. Bozbey, K. Usenmez, E.C. Aydogan, S. Razmkhah, A. Fujimaki “Current Biased Superconducting Stripline Detectors: Fundamentals and SFQ read-out", International Conference on Condensed Matter and Materials Science, Adana, Turkey, 2017.
- S. Razmkhah, P. Febvre, “CAD Methodologies and Tools for Single Flux Quantum Based Superconductive Electronics”, SSSE, Minorca, Spain, 2018.
- C. J. Fourie, K. Jackman, M. M. Botha, S. Razmkhah, P. Febvre, C. L. Ayala, Q. Xu, N. Yoshikawa, E. Patrick, M. Law, Y. Wang, M. Annavaram, P. Beerel, S. Gupta, S. Nazarian, M. Pedram, “ColdFlux: CAD Methodologies and Tools for Single Flux Quantum Based Superconductive Electronics”, Applied Superconductivity Conference (ASC2018), Seattle, USA, 2018.
- S. Razmkhah, P. Febvre, " A New Graphical Interface Software for simulating Josephson-based superconducting digital circuits ", ISEC2019, Riverside, CA, USA, 2019.
- U. Yilmaz, R. Collot, J. Kunert, R. Stolz, P. Febvre, S. Razmkhah, " Study of microwave resonances induced by bias lines in shunted Josephson junctions", ISEC2019, Riverside, CA, USA, 2019.
- P. Febvre, S. Razmkhah, K. Jackman, C. Fourie, " Flux-coupled asynchronous hybrid SQUID operating in a closed cycle GM cooler", ISEC2019, Riverside, CA, USA, 2019.
- U. Yilmaz, S. Razmkhah, A. Bozbey, P. Febvre" Study of microwave resonances induced by bias lines in shunted Josephson junctions", EUCAS2019, Glasgow, Scotland, 2019.
- S. Razmkhah, P. Febvre" Passive Transmission Lines at Ultimate Clock Frequencies of SFQ Circuits", EUCAS2019, Glasgow, Scotland, 2019.
- S. Razmkhah, A. Bozbey, P. Febvre" A Compact Voltage Pulse Multiplier for SFQ Circuit Readout", EUCAS2019, Glasgow, Scotland, 2019.
- S. Syrotenko, U. Yilmaz, S. Razmkhah, O. Protsenko and P. Febvre, "Experimental Study and Time-domain Analysis of Microwave Resonances of a Transformer-coupled DC SQUID at Different Temperatures," 2019 IEEE 9th International Conference Nanomaterials: Applications & Properties (NAP), Odesa, Ukraine, 2019.
- S. Ilin, S. Razmkhah, U. Yilmaz, O. Protsenko and P. Febvre, "Static Analysis to Predict Behaviour of Bi-SQUIDs in External Magnetic Field," 2019 IEEE 9th International Conference Nanomaterials: Applications & Properties (NAP), Odesa, Ukraine, 2019.
- K. Ochkan, S. Razmkhah, P. Febvre, E. Zhitlukhina, and M. Belogolovskii, “Investigating a Discrete Model of Memristive Systems,” in 2019 XIth International Scientific and Practical Conference on Electronics and Information Technologies (ELIT), 2019, pp. 261–264.
- P. Roux, C. Fourie, S. Razmkhah, P. Febvre, “Accurate small signal simulation of superconductor interconnects in SPICE”, ASC2020, USA, 2020.
- B. Z. Ucpinar, S. Razmkhah, U. Yilmaz, I. Bozkurt, P. Febvre, A. Bozbey, “development of integrated digital squid with digital signal processing circuits”, ICSM2021, Turkey, 2021.
- P. Febvre, S. Razmkhah, U. Yilmaz, A. Bozbey, “recent advances in the design of digital and mixed-signal superconducting circuits and sensors”, ICSM2021, Turkey, 2021.
- U. Yilmaz, S. Razmkhah, P. Febvre, A. Bozbey, “study of an asynchronous hybrid rsfq-based flux digitizer”, ICSM2021, Turkey, 2021.
- A. Bozbey, S. Razmkhah, A. Karamuftuoglu, M. Ozbayoglu , “Josephson Junction Based Artificial Neuron”, ICSM2021, Turkey, 2021.
- D. Erenler, U. Yilmaz, S. Razmkhah, A. Bozbey, P. Febvre, “analysis of the magnetic field produced by different cryocooler systems”, ICSM2021, Turkey, 2021.
- N. O. Tekci, E. kucukyilmaz, Y. Kopur, S. Razmkhah, A. Bozbey, “on chip temperature sensor for single flux quantum chips”, ICSM2021, Turkey, 2021.
- A.A. Kalenyuk, S.I. Futimskii, A.L. Kasatkin, A.P. Shapovalov, A.A. Kordyuk, S. Razmkhah, P. Febvre, “nonlinear effects in microwave hts film hilbert fractal resonators”, ICSM2021, Turkey, 2021.
- A. Akgün, S. Razmkhah, “PySQIF, a Statistical Analysis and Optimization Tool for Bi-SQUID Circuits”, 34th international symposium on superconductivity, Japan, 2021.
- A. Akgün, S. Razmkhah, P Febvre, “An Open-Source Analysis Library for Josephson Junctions”, Applied Superconductivity Conference (ASC2022), Honolulu, USA, 2022.
- C. J. Fourie, Kyle Jackman, J. A. Delport, P. Febvre, S. Razmkhah, C. L. Ayala, O. Chen, N. Yoshikawa, M. Law, E. Patrick, Y. Wang, P. Beerel, S. Gupta, M. Annavaram, S. Nazarian, and M. Pedram, “In from the cold: Five years of progress in superconductor integrated circuit design tools under ColdFlux”, Applied Superconductivity Conference (ASC2022), Honolulu, USA, 2022.
- S. Razmkhah, A. Bozbey, P. Febvre, “Superconductor modulation circuits for Qubit control at microwave frequencies”, Applied Superconductivity Conference (ASC2022), Honolulu, USA, 2022.
- B. Z. Ucpinar, M. A. Karamuftuoglu, S. Razmkhah, M. Pedram, “On-Chip Trainable Neuron Circuit for SFQ-Based Spiking Neural Networks”, European Conference on Applied Superconductivity (EUCAS2023), Bologna, Italy, 2023.
- M. A. Karamuftuoglu, B. Z. Ucpinar, S. Razmkhah, M. Kamal, M. Pedram, “SFQ-Based Spiking Neural Network Accelerator with High Accuracy and Ultra-high Throughput”, European Conference on Applied Superconductivity (EUCAS2023), Bologna, Italy, 2023.
- B. Z. Ucpinar, Y. Kopur, A. Abdollahi, S. Razmkhah, M. Kamal, M. Pedram,“Mapping NP-Complete problems onto Josephson Parametric Oscillator-Based Ising Machines”, European Conference on Applied Superconductivity (EUCAS2023), Bologna, Italy, 2023.
- M. Li, S. Razmkhah, M. Pedram, “An Integrated Place & Route Tool for Handling SFQ Circuits Comprising Simple and Complex Multi-Stage Logic Cells”, European Conference on Applied Superconductivity (EUCAS2023), Bologna, Italy, 2023.
- S. Razmkhah, P. Febvre, M. Pedram, “qConnect: Increasing Qubit Connectivity in Quantum Computing Fabric Using Active Resonators”, Applied Superconductivity Conference (ASC2024), Salt Lake City, USA, 2024.
- M. A. Karamuftuoglu, B. Z. Ucpinar, S. Razmkhah, M. Kamal, M. Pedram, “ScVMM: Vector-Matrix Multiplication Using Superconductor Devices”, Applied Superconductivity Conference (ASC2024), Salt Lake City, USA, 2024.
- B. Z. Ucpinar, M. A. Karamuftuoglu, S. Razmkhah, M. Kamal, M. Pedram,“On-Chip Control and Readout Circuits for Superconductor Ising Annealer”, Applied Superconductivity Conference (ASC2024), Salt Lake City, USA, 2024.
- M. Li, S. Razmkhah, M. Pedram, “PhaseConnect: Automated Circuit Design for the Superconductor Phase-Based Logic”, Applied Superconductivity Conference (ASC2024), Salt Lake City, USA, 2024.
- M. Li, S. Razmkhah, M. Pedram, “Efficient Multiplier Architecture Tailored for Superconductor Logic”, Applied Superconductivity Conference (ASC2024), Salt Lake City, USA, 2024.