Professor Krishna Balram
Abstract:
50+ years of Moore's law and related advances in nanofabrication have taught us how to make nanoscale objects routinely. But getting information (both classical and quantum) efficiently into and out of these (deeply sub-wavelength) nanoscale objects remains an unsolved problem in general. In this talk, we will discuss one instance of this 'nanoscale wiring' problem: interfacing GHz microwave signals efficiently with nanoscale devices using acoustic waves as an intermediary. We show how the same efficiency challenges occur in three very different contexts:
(a) building piezoelectric quantum microwave to optical signal transducers [1,2] for connecting remote superconducting qubit based quantum processors
(b) phononic integrated circuits for re-thinking RF front-ends [3,4], bringing ideas from silicon photonics to microwave devices
(c) piezoelectric micro-resonators for electron spin resonance (ESR) experiments on single nanoparticles [5], and the prospects for electrical readout of single spins at cryogenic temperatures
References:
[1] K.C. Balram and K. Srinivasan, K. Advanced Quantum Technologies, 5(3), p.2100095, 2002
[2] A. Khurana, P. Jiang, P. and K.C. Balram, Physical Review Applied, 18(5), p.054030, 2022
[3] M. Bicer and K.C. Balram, IEEE Trans. UFFC, 71(1), 172, 2023
[4] K.C. Balram, Applied Physics Letters 125 (20) 2024
[5] C.S. Kline, J.M-Ruz, and K.C. Balram, arXiv:2405.02212, accepted in Phys. Rev. Applied
Bio:
Krishna Balram is currently a Professor of Nanoscale Device Engineering at the University of Bristol. His research group works on the development of novel nanofabricated device platforms for manipulating light and GHz sound waves at the nanoscale, and engineering controlled interactions between them and other solid-state quantum systems. He received his PhD from Stanford University, working with David A.B. Miller, and was a postdoc at NIST with Kartik Srinivasan before joining Bristol. His research is supported by an ERC starting and consolidator grant awards. More details can be found at: https://krishnacbalram.github.io/index.html
Krishna Balram is currently a Professor of Nanoscale Device Engineering at the University of Bristol. His research group works on the development of novel nanofabricated device platforms for manipulating light and GHz sound waves at the nanoscale, and engineering controlled interactions between them and other solid-state quantum systems. He received his PhD from Stanford University, working with David A.B. Miller, and was a postdoc at NIST with Kartik Srinivasan before joining Bristol. His research is supported by an ERC starting and consolidator grant awards. More details can be found at: https://krishnacbalram.github.io/index.html
