Members

Sangkha Borah

Dr. Sangkha Borah, Postdoctoral Scholar

I am an enthusiastic computational physicist who likes to use computers to make a physicist’s life easier. In this spirit, my research interests have evolved from molecular dynamics [1, 2], and density functional theory to applications based on machine learning techniques. Previous work of mine has focused on relaxation dynamics and hot carrier transport on 2D materials while developing an interest in machine learning as well. In the Quantum Machines Unit my main research interests will include the application of machine learning methods to quantum physical problems and to apply it to better design experiments, among others.

[1] Sangkha Borah, J. Mol. Liq., 2020, 312, 113387.
[2] Sangkha Borah, J. Phys. Chem. B, 2020, 124(26), 5454.

PhD 2018 Physics Indian Institute of Technology (India, Guwahati)

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Email: sangkha.borah@oist.jp

Priscila Romagnoli

Dr. Priscila Romagnoli, Postdoctoral Scholar

I am an experimental scientist in nanophotonics, with professional experience and interests in areas such as: quantum optics, studying fiber-based optical cavities for cavity quantum electrodynamics (cQED) [1]; nanomaterials, investigating optical properties [2]; and photonic crystal fibers, developing in-line devices [3].

[1] Romagnoli, P. et al. Appl. Phys. B 126, 111 (2020)
[2] Romagnoli, P. et al. 2D Mater. 2, 035017 (2015)
[3] Romagnoli, P. et al. Opt. Express 22, 17769-17775 (2014)

PhD 2017 Electrical Engineering, Mackenzie Presbyterian University (Brazil, Sao Paulo)

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Email: priscila.romagnoli@oist.jp

Ruvi Lecamwasam

Ruvi Lecamwasam, Postdoctoral Scholar (commencing Feb 2021)

My work has been a mixture of optomechanics and quantum information theory, and how these relate to measurement. During my honours year I looked at how measurement itself could be used to create quantum states [1]. For my PhD I worked as a theorist in an experimental group on a project to levitate a mirror using a laser beam, and so build a sensor that is completely isolated from environmental noise. The system could be solved using perturbation theory, allowing for an analytical treatment of the ‘optical spring’ the mirror oscillates on [2]. I also investigated the idea of parameter estimation from an information theoretic point of view, and studied how the entropy of the prior information and your choice of measurement basis influence how you estimate the parameter.

[1] Lecamwasam, Ruvindha L., et al.,  Phys Rev A 95 : 013828 (2017)
 https://doi.org/10.1103/PhysRevA.95.013828.
[2] Lecamwasam, Ruvi, et al.,  Phys Rev A 101 (5): 053857 (2020).
 https://doi.org/10.1103/PhysRevA.101.053857.

PhD 2020 TBA, Australian National University (Australia, Canberra)

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Yanan Liu

Yanan Liu, Postdoctoral Scholar (commencing Feb 2021)

My work has been about developing feedback control theory in stochastic quantum systems, including measurement-based feedback control and coherent feedback control. The main objectives of the measurement based stochastic techniques are to engineer the system towards a target quantum subspace or state, including entangled states and decoherence free subspaces. In the coherent feedback control technique we design coherent feedback controllers that achieve stable dynamics within a quantum system  that is experiencing fault processes. Currently, I am studying  how to enhance quantum squeezing within an Optical Parametric Oscillator (OPO) by designing a coherent feedback controller.

[1] Y. Liu et al, IEEE Transactions on Cybernetics, 47(11), pp. 3827-3839, Nov. 2017
[2] Y Liu et al, Online available at: [quant-ph] arXiv:2003.09609

PhD 2020 TBA, University of New South Wales (Australia)

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Hoshu Hiyane

Hoshu Hiyane, Rotation Student (commencing Jan 2021)

I graduated with a Bachelor of Science degree in Physics from Tokyo. In Tokyo University of Science as part of my graduate project, I studied the dynamic properties in Bose-Einstein condensate (BEC) at finite temperature. Recently I discovered OIST and I took an internship in the Quantum Systems Unit (Prof Busch), and continued my research on spin-orbit coupling in BEC. I am now in the OIST Ph.D. program and undertaking a number of rotations. I start my rotation in the Quantum Machines Unit (Prof Twamley), in January 2021.

Soma Mishra

Soma Mishra, Rotation Student (commencing May 2021)

Starting May 2020 I have joined OIST as a PhD student in Physics. I have a undergraduate degree of Master of Science (Honours) in Physics, from Birla Institute of Technology and Science (BITS) Pilani, Pilani, India, and completed a MSc in the Department of Physics, Indian Institute of Science (IISc.), Bangalore, titled 'Fabrication and low-temperature characterization of superconducting thin-film microwave resonators of Aluminum'.  In that MSc I designed, fabricated and tested superconducting coplanar waveguide resonators in a cryogenic dilution fridge. Before starting my PhD I interned at OIST in the Light-Matter Interactions for Quantum Technologies Unit (Síle Nic Chormaic), and worked in the Nano-Bio-Optics lab and in fabrications. I am interested in quantum information technology, in quantum detectors of vacuum fluctuations, superconducting qubits and various kinds of artificial atomic systems. I am thrilled by quantum field theory and the rich potential of quantum electrodynamics.

MSc (Honours), in Physics, from Birla Institute of Technology and Science (BITS) Pilani, Pilani, India (2017)

Miwa Matsui, Research Unit Administrator

Email: miwa.matsui@oist.jp