Research

News in 2020

2020.12.11 Prof. Ohmori was invited to give a talk about “Ultrafast quantum simulator with attosecond precision at ultracold temperatures” (abstract)at OIST(Okinawa Institute of Science and Technology Graduate University), Optics Seminars, (11 December 2020, Online)
2020.11.30 Cheers to your family and the new little one, Dr.Bharti! We wish you all the best.
2020.10.21 Dr.Sylvain De Leseleuc had selected as a ‘Highly Commended’ runner up for the IOP International Quantum Technology Emerging Researcher Award on the virtual conference.(Certificate of commendation
2020.10.19-20 Dr.Sylvain De Leseleuc had selected as a ‘Highly Commended’ runner up for the IOP International Quantum Technology Emerging Researcher Award on the virtual conference.(certificate of commendation
2020. 10 Yeelai Chew won the Student Presentation Award of the Physical Society of Japan 2020 on the web.(The Physical Society of Japan)(presentation date:10 September)
2020.9.29 Professor Kenji Ohmori gave a talk about “Ultrafast quantum simulator with attosecond precision at ultracold temperatures” on the web. (Fundamental Sciences and Quantum Technologies using Atomic Systems (FSQT 2020) organized by Atomic, Molecular and Optical Physics Division Physical Research Laboratory, supported by SciRox, Science Club, GNDU, Amritsar, Punjab, India, 29 September, 2020).
2020.09.28-29 Dr. Takafumi Tomita attended the 2nd Cold Atom Workshop “Atom no kai” and gave a one-hour invited presentation on the topic: “Quantum simulation and computation with assembled arrays of Rydberg atoms”.
2020.9.18 Best wishes for your baby’s happy future, Dr.Sugawa. Happy wedding, Dr. Tomita. We wish you all the best. Sweets are forever!
2020.9.10 (Update from 3G) We keep scaling up our number of optical tweezers! In June, Dr. Tomita replaced the old NA=0.4 objective and its severe spherical aberrations by our amazing diffraction-limited NA=0.75 objective; offline characterization of its performance suggests that our tweezers size will be reduced from 1.5 μm to 0.6 μm! After much contortion to install and finely adjust the objective (requirement of better than 0.05°…), the hard-work paid off and we can now trap up to 225 atoms, a ten-fold improvement.
2020.8.10 Professor Kenji Ohmori’s lecture ( see the lecture video) on “Ultrafast quantum simulator with attosecond precision at ultracold temperatures” (India-Japan webinar on quantum technologies organized by the Embassy of India, Tokyo, supported by the governments of India and Japan, 28 July 2020).
2020.6.23 Our new paper has been published in Physical Review Letters, a flagship journal of American Physical Society.

“Ultrafast creation of overlapping Rydberg electrons in an atomic BEC and Mott-insulator lattice”
Michiteru Mizoguchi, Yichi Zhang, Masaya Kunimi, Akira Tanaka, Shuntaro Takeda, Nobuyuki Takei, Vineet Bharti, Kuniaki Koyasu, Tetsuo Kishimoto, Dieter Jaksch, Alexander Glaetzle, Martin Kiffner, Guido Masella, Guido Pupillo, Matthias Weidemüller, and Kenji Ohmori
Phys. Rev. Lett. 124, 253201 (2020).

IMS Press Release (website)

2020.6.9 (Update from 3G) Mahesh obtained his first Rydberg spectrum with our picosecond pulsed lasers. After spectrally shaping the pulses to decrease their bandwidth from 1 THz to ~100 GHz, he could resolve the series of Rydberg states from n = 32 to 36. Nice! The plot shows the probability to excite the atoms to a Rydberg state (observed as an atom loss, after ~10 pulses) versus the laser detuning from the ionization threshold.
2020.6.8 After three years as an IMS fellow in our group, Dr. Yichi Zhang is moving back to the State Key Laboratory of Quantum Optics and Quantum Optics Devices (Shanxi University) as an Associate Professor! Thanks for all the hard work on the optical lattice setup, with some beautiful results currently in press.
2020.5.8 (Update from 3G) Chew succeeded in ordering a small array of atoms by moving them one by one with an automated moving tweezers [original demonstration is from Barredo et al., Science 354, 1021 (2016)]. Congrats! The picture shows atomic arrays having been re-assembled from a random state into a checkerboard pattern or two rows of 4 atoms.
2020.2.7 The Kyoto and Okazaki optical tweezers teams met and had great discussions about their respective works with Ytterbium (at Kyoto, in the laboratory of Prof. Takahashi) and Rubidium (here). Thanks Takei and your team for coming here, next time we go to Kyoto!
2020.1.29 (Update from 3G) We made our first holographic arrays of tweezers using a spatial light modulator (SLM) from Hamamatsu Photonics. The left picture is a one-shot fluorescence image of single atoms, randomly loaded in the tweezers with a probability of ~50%. The right picture is obtained by averaging more than 20000 such single-shot images.

2020.1.22 (Update from 3G) The specially-designed objective (NA = 0.75) for the optical tweezers experiment arrived, thanks Special Optics! Tomita will be checking its performance and then replace the old objective (Mitutoyo NA = 0.4, no window correction) to create beautiful arrays of tweezers. The pictures show how massive (1 kg, length 170 mm, diameter 75 mm) is the new objective compared to the commercial Mitutoyo objective, due to our strict requirements on having both large NA and long working distance.

2020.1.17 Professor Kenji Ohmori has been appointed to a Councilor of the prestigious Gordon Research Conferences (website).
2020.1.7-9 Prof. Kenji Ohmori attended the GRC Quantum Control of Light and Matter2021 Chair’s Training at Singapore. (7-9 January 2020, Singapore Marriott Tang Plaza Hotel, Singapore)

 

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