Dr. Fernando Quijandria, Staff Scientist

I am a theoretical physicist working in the field of microwave quantum optics (superconducting circuits technologies) with focus on continuous-variable quantum information. I like to study novel phenomena both analytically and numerically but also, to model experiments in which these phenomena can be explored. My work involves the generation of nonclassical states of light [1,2], gate-based quantum computation [3] and more recently quantum error correction and quantum process tomography.

[1] Quijandria et al. Phys. Rev. Lett. 121, 263603 (2018)
[2] Lu et al. arXiv:2101.09532 (2021) 
[3] Hillmann et al. Phys. Rev. Lett. 125, 160501 (2020)

PhD 2015 University of Zaragoza (Spain, Aragon)

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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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Ruvi Lecamwasam

Dr. Ruvi Lecamwasam, Postdoctoral Scholar

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)
[2] Lecamwasam, Ruvi, et al.,  Phys Rev A 101 (5): 053857 (2020).

PhD 2021 Australian National University (Australia, Canberra)

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Yanan Liu

Dr. Yanan Liu, Postdoctoral Scholar

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 2021 Philosophy, University of New South Wales (Australia)

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Kani Mohamed

Dr. Kani Mohamed, Postdoctoral Scholar

I am a theoretical physicist working in the fields of quantum optics, optomechanics, and atomic physics. This includes understanding of the microscopic world as well as their interaction with external stimulus,and exploiting their quantum behaviour for precision metrology. My previous work in levitated optomechanics involves implementing phonon laser for force sensing below the thermal noise limit. I have also worked in Light-Matter interaction wherein I have used the quantum interference to manipulate the atomic coherence and control all nonlinear optical phenomena for realizing sensitive vector atomic magnetometer and atomic clock.

[1] J. Opt. Soc. Am. B, 37, 1598 (2020)
[2] J. Phys. B: At. Mol. Opt. Phys. 48, 075502 (2015)
[3] Opt. Express 22, 15305–15314 (2014)

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

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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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Bijita Sarma

Dr. Bijita Sarma, Postdoctoral Scholar

I am a theoretical physicist working in the areas of hybrid quantum devices such as cavity optomechanical and magnomechanical systems. My previous work has been on ground state cooling of mechanical resonator in a cavity optomechanical system in the unresolved sideband regime using quantum interference as well as a STIRAP-like pulsed-cooling protocol. I have also looked at generation of nonclassical states of light and mechanics through photon and phonon antibunching in hybrid cavity optomechanical systems.

[1] Bijita Sarma et al., New J. Phys. 22, 103043 (2020)
[2] Bijita Sarma et al., Phys. Rev. A 98, 013826 (2018)
[3] Bijita Sarma et al., Sci. Rep. 8, 14583 (2018)

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

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Dr. Shilu Tian, Postdoctoral Scholar

I am an experimental physicist with experience in multiferroics. My previous work was on ferroelectric polarization modulation, flexoelectricity, electroresistance effect, ferroelectric photovoltaic effect, etc. Currently, I have turned my interest to quantum science. In Quantum Machine Unit, I will work on the experimental realization of quantum machines using a magnetic levitation system, especially in cryogenic and high-vacuum conditions.

[1]ACS Appl. Mater. Interfaces 10.50 (2018): 43792-43801.
[2] Sci. China Phys. Mech. Astron. 63.1 (2020): 1-7.

PhD 2019 University of Chinese Academy of Sciences (China, Beijing)

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Tatiana Iakovleva, PhD Student

I got my Master’s degree at Novosibirsk State University in Russia where I worked on the concept of geometric phase in different quantum systems, such as Bose-Einstein condensate in a dipole trap, and a chain of Mach-Zehnder interferometers where interaction with the environment occurs. Afterwards, I came to study at OIST as a PhD student, and after my first rotation I decided to join Quantum Machines unit. I am interested in quantum sensors, quantum computing and machine learning. Beyond physics, I fancy playing board games, volleyball, and also I am a big lover of delicious food.

Daehee Kim

Daehee Kim, PhD Student

I studied in Hokkaido University, receiving an undergraduate degree in Physics. During that time, I enjoyed two internships, for a total of 4 months, within the Quantum Machines Unit during 2021. There I worked on magnetic levitation including analyses in python, Matlab and Mathematica. I am interested in programming and simulations and hope to conduct research involving quantum technology after I start my PhD at OIST next spring.


Raul Hidalgo Sacoto, Rotation Student (May-Aug 2022)

I am an Ecuadorian theoretical physicist, mainly working in quantum stuff, such as multicomponent Bose Einstein condensate under artificial gauge fields, open quantum systems [1], and modeling of dynamics of solid state physics [2,3]. I am performing a Rotation in the Quantum Machines Unit working on the theory of decoherence in Nitrogen Vacancy defects in diamond. Outside of the quantum office, I like to play basket, video games, free diving, cycling, and jogging.

[1] Svozilík, J., Hidalgo-Sacoto, R. & Arkhipov, I.I. Sci Rep 10, 18258 (2020).
[2] Hidalgo-Sacoto, R., et al. Phys. Rev. B. 101.20 (2020).
[3] Torres, Juan Daniel, et al. Phys. Rev. B. 102.3 (2020).

Amal Jose

Amal Jose, Rotation Student (May-Aug 2022)

I have recently completed a 5-year integrated MSc in Photonics from Cochin University of Science and Technology(CUSAT) in India. During my master's thesis there, under the guidance of Dr. Manu Vaishakh, I researched the topic "Pinhole size and position dependence of Thermal lens Technique". I have recently joined OIST as a new PhD student and am undertaking a four month rotation in the Quantum Machines Unit researching experiments to do with optical wavefront characterisation. My research interest is focused on theoretical and experimental aspects of optics, Photonics, and quantum mechanics. I have experience in different programming languages and image and numerical analysis software and related tools.  I have an open mindset to learn new topics and proceed with challenging projects.

Jingbo Wang

Professor Jingbo Wang, JSPS Visiting Fellow (June-July 2022)

Professor Jingbo Wang is Head of Physics at the University of Western Australia and a pioneer of cutting-edge research involving single and multiple particle quantum walks. Professor Wang leads an active research group looking at quantum simulation, quantum walks and quantum algorithm development. Her research team was the first to show the power of quantum walks in extracting local and global structural information of complex networks and in distinguishing a range of non-isomorphic graph classes. Professor Wang’s recent work includes quantum simulation of designer functional molecules and materials, exploring fundamental structures and symmetries in nature.

University of Western Australia, Perth, Australia

PhD, 1989, Adelaide University, Australia

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Miwa Matsui, Research Unit Administrator