Franklin Cho Talk: June 7, 2019 High-frequency (HF) electron spin resonance (ESR) spectroscopy and ESR based quantum computing Electron spin resonance (ESR)
Talk: June 7, 2019
High-frequency (HF) electron spin resonance (ESR) spectroscopy and ESR based quantum computing
Electron spin resonance (ESR) spectroscopy is a powerful and versatile tool for probing and studying local structures and dynamic properties of various compounds in liquids and solids; for example, structures and dynamics in biological molecules, magnetic structures and relaxations in magnetic molecules and quantum coherence in solid-state spin systems.
High-frequency (HF) ESR spectroscopy is an emerging technique enabling finer spectral resolution, better absolute sensitivity, and improved time resolution. I will first talk about the development of a HF ESR spectrometer at the University of Sothern California [1,2]. The spectrometer consisting of a high-power HF solid-state source, a quasioptical system, a phase-sensitive superheterodyne detection system, a 12.1 Tesla cryogenic-free superconducting magnet, and a 4He cryostat enables pulsed ESR measurements with a few hundred nanosecond pulses. I will also discuss some of its unique experimental capabilities such as double electron-electron resonance and dynamical decoupling to study paramagnetic impurities existing in synthetic diamond crystals.
If time permits, I will then talk about our efforts on ESR based quantum computing at the University of Waterloo, particularly experimental realization of a quantum algorithm known as heat-bath algorithmic cooling using a solid-state electron-nuclear coupled system . A home-built pulsed X-band ESR spectrometer with arbitrary waveform generator is employed (electron-nuclear double resonance capability was added later) . Major focus has been understanding noises and improving quantum control which is critical in the field of quantum computing and quantum information processing [5,6].
 F. H. Cho, V. Stepanov, and S. Takahashi, Review of Scientific Instruments 85, 075110 (2014).
 F. H. Cho, V. Stepanov,C. Abeywardana, and S. Takahashi, Methods in Enzymology 563, 95 (2015)
 D. K. Park, G. Feng, R. Rahimi, S. Labruyère, T. Shibata, S. Nakazawa, K. Sato, T. Takui, R. Laflamme, and J. Baugh, Quantum Information Processing 14, 2435 (2015)
 D. K. Park, G. Feng, R. Rahimi, J. Baugh, and R. Laflamme, Journal of Magnetic Resonance 267, 68 (2016)
 G. Feng, J. J. Wallman, B. Buonacorsi, F. H. Cho, D. K. Park, T. Xin, D. Lu, J. Baugh, and R. Laflamme, Physical Review Letters 117, 260501 (2016)
 G. Feng, F. H. Cho, H. Katiyar, J. Li, D. Lu, J. Baugh, and R. Laflamme, Physical Review A 98, 052341 (2018)
(Friday) 1:30 pm - 2:30 pm