Members

Fernando

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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Email: sangkha.borah@oist.jp

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)
 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 2021 Australian National University (Australia, Canberra)

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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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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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Email: bijita.sarma@oist.jp

Fernando

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. https://doi.org/10.1021/acsami.8b15703
[2] Sci. China Phys. Mech. Astron. 63.1 (2020): 1-7. https://doi.org/10.1007/s11433-019-9415-9

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

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Tanya

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.

Karina

Karina Yadav, Research Intern (Sep-Feb 2023)

Hai-sai! I graduated this year (2022) with a Bachelor's degree in Electronics and Telecommunication Engineering . I have expertise in  developing software required for electronic hardware (simulation & design). Apart from the core courses I've been involved with internships in computer programming which also included a project related to mapping. My core area of interest is the use of electromagnetics in biomedical engineering. I'm keen to explore the Quantum world for advancing the biomedical instruments and sensing. I'm joining as a Research Intern at OIST, and I look forward to exploring the field of quantum machines!

Alex

Alexander Henry Hodges, Rotation Student (Sep-Dec 2022)

I'm an experimental physicist interested in using quantum effects for sensing & information processing. I've worked on designing nanolasers for photonics applications, and on using ultracold molecular beams to measure the electron's electric dipole moment. I also spent the year after graduating masquerading as a microelectronics engineer, designing image sensor chips and digital logic (with 65nm transistors!), so I'm excited to be back in a lab playing with lasers and (hopefully) doing some new science.

 

Miwa Matsui, Research Unit Administrator

Email: miwa.matsui@oist.jp