November 2024
Kuwahara uploaded a new paper titled “Boson Clustering and Low-Density Properties at High Temperatures” on arXiv. This work is a joint work with Xin-Hai Tong and Zongping Gong from the University of Tokyo.
November 7, 2024: Kuwahara presented a seminar titled “Quantum complexity and generalized area law in fully connected models” at the Yukawa Institute for Theoretical Physics, Kyoto University.
November 6–8, 2024: Kuwahara delivered a series of intensive lectures at the Yukawa Institute for Theoretical Physics, Kyoto University, on “Universal Information Limits in Quantum Many-Body Systems.”
Lecture notes:
November 2024: The paper “Entanglement area law in interacting bosons: from Bose-Hubbard, φ4, and beyond” by Donghoon Kim and Kuwahara was published on arXiv.
November 2024: The paper “Quantum complexity and generalized area law in fully connected models” by Donghoon Kim and Kuwahara was published on arXiv.
October 2024
At the international conference Quantum Innovation, held from October 21–23 at the Ochanomizu Sola City Conference Center, Shang Cheng presented a poster on “Equivalence between Operator Spreading and Information Propagation,” while Kuwahara delivered an invited talk on “Clustering of Conditional Mutual Information and Quantum Markov Structure at Arbitrary Temperatures.”
For more information, visithttps://quantum-innovation.riken.jp/
Shang Cheng, a former JRA student, joined us as a Special Research Fellow on October 1st and will continue conducting research with our team.
September 2024
From September 21 to 29, Shang Cheng gave an invited talk on “Topological Quantum Batteries” at the 21st International Workshop on Pseudo-Hermitian Hamiltonians in Quantum Physics (PHHQP-XXI), held in Chania, Greece.
From September 9 to 13, Yusuke Kimura, Donghoon Kim, and Shang Cheng presented posters at the 19th Theory of Quantum Computation, Communication and Cryptography (TQC2024) held at the Okinawa Institute of Science and Technology Graduate University (OIST). Their presentations were titled “Clustering theorem in 1D long-range interacting systems at arbitrary temperatures,” “Thermal Area Law in Long-Range Interacting Systems,” and “Equivalence between operator spreading and information propagation,” respectively.
Additionally, the “Clustering theorem in 1D long-range interacting systems at arbitrary temperatures” poster was selected as an Outstanding Poster (19 out of 420 submissions were selected).
A paper titled “Efficient Simulation of 1D Long-Range Interacting Systems at Any Temperature,” co-authored by Achutha Rakesh, Donghoon Kim, Yusuke Kimura, and Kuwahara, has been published on arXiv.
August 2024
From August 26 to 30, Donghoon Kim presented a poster titled “Thermal Area Law in Long-Range Interacting Systems” at the 24th Asian Quantum Information Science Conference (AQIS2024) held at Hokkaido University.
http://aqis-conf.org/2024/wp-content/uploads/2024/08/Aug27-UploadAUg9.pdf
A joint paper titled “Fidelity-dissipation relations in quantum gates” by Tan Van Vu, a former team member, Kuwahara, and Keiji Saito (Kyoto University) has been published in Physical Review Research.
July 2024:
Shang Chen, a JRA graduate student, successfully defended his Ph.D. thesis, “Operator Analyses of Open Quantum Systems,” on July 16 and was awarded his doctorate.
A new paper by Kuwahara titled “Clustering of Conditional Mutual Information and Quantum Markov Structure at Arbitrary Temperatures” has been uploaded on arXiv.
Donghoon Kim participated in the “Frontiers in Non-equilibrium Physics 2024” conference held at Kyoto University.
Achutha Rakesh completed a two-month internship and has returned to India.
At the RQC Summer Session 2024, held at RIKEN RQC, Yusuke Kimura and Achutha Rakesh presented posters on “Clustering Theorem in 1D Long-range Interacting Systems at Arbitrary Temperatures” and “Efficient Simulation of 1D Long-range Interacting Systems at Arbitrary Temperatures,” respectively.
Xun Gao from the University of Colorado Boulder visited our lab from July 3 to July 4.
May 2024
Yusuke Kimura gave a seminar presentation on “Black hole graviton and quantum gravity” at RIKEN iTHEMS.
Rakesh Achutha from the Indian Institute of Technology Varanasi, India, joined our research team as an intern from May 14 to July 13.
Koutaro Kato from Nagoya University visited our research team from May 8 to May 10.
A paper by JRA student Shang Cheng, titled “Topological Quantum Batteries,” was published on arXiv.
A joint paper by Kuwabara and Marius Lemm from the University of Tübingen titled “Enhanced Lieb-Robinson bounds for a class of Bose-Hubbard type Hamiltonians” was published on arXiv.
April 2024
Kuwabara presented a seminar on “Clustering of conditional mutual information and quantum Markov structure at arbitrary temperatures” at the April cyclic meeting for the Academic Revolution A “Extreme Universe.”
Donghoon Kim gave a seminar on “Thermal and Spatial Entanglement of Exotic Quantum Impurity Systems” at the Hanedano Laboratory, University of Tokyo.
A paper by JRA student Shang Cheng, titled “Resonance-dominant optomechanical entanglement in open quantum systems,” was published in Physical Review Applied.
Joint paper by Kuwabara, Donghoon Kim and Keiji Saito of Kyoto University on “Thermal Area Law in Long-Range Interacting Systems”, published on arXiv.
Tan Van Vu has moved to the Yukawa Institute for Theoretical Physics, Kyoto University, as Associate Professor.
March 2024
Donghoon Kim gave a talk on “Thermal and Spatial Entanglement of Quantum Impurity Systems” at the SQAI-NCTS Workshop on Tensor Network and Quantum Embedding held at the University of Tokyo.
A joint paper by Kuwahara, Tan Van Vu, and Keiji Saito of Kyoto University titled “Effective light cone and digital quantum simulation of interacting bosons” was published in Nature Communications.
A joint paper by Kuwahara and Yusuke Kimura titled “Clustering theorem in 1D long-range interacting systems at arbitrary temperatures” was released on arXiv.
Tan Van Vu received the RIKEN Research Incentive Award (Ohbu Award) in the fiscal year 2023 for his work on “Elucidation of universal relations regarding energy cost and speed in quantum control of nonequilibrium systems,”
This year, two researchers, including Vu, were selected from the entire RQC Center.
Tan Van Vu gave an invited lecture at the APS March Meeting 2024 held in Minneapolis, USA.
Donghoon Kim, who earned his Ph.D. from KAIST in South Korea, joined our team.
Yusuke Kimura was accepted for the Grant-in-Aid for Scientific Research C (KAKENHI C).
(Title:量子情報理論による相転移点近傍の複雑性解析と量子コンピュータへの応用)
Kuwahara was accepted as a research collaborator for the Grant-in-Aid for Scientific Research S (KAKENHI S).
(Foundation Creation for Secure Distributed Quantum Computing with Medium-Scale Quantum Computers)
February 2024
Tomotaka Kuwahara participated in the long-term program “Quantum Algorithms, Complexity, and Fault Tolerance” held at the Simons Institute of Theoretical Computing.
Cheng Shang, a RIKEN JRA, co-organized the Stat&QuantPhys Winter School 2024 (SQP2024).
A CPR project kickoff meeting and retreat were held, involving the Morimoto Ultrafast Electron Beam Science RIKEN Hakubi Research Team, Kato Nanoscale Quantum Photonics Laboratory, and our laboratory. Tomotaka Kuwahara, Yusuke Kimura, Tan Van Vu, Cheng Shang, and Hideaki Nishikawa from the Kuwahara team participated.
January 2024
Tomotaka Kuwahara, Cheng Shang, and Tan Van Vu attended the international conference on Quantum Information Processing (QIP2024) held in Taipei at the Taipei International Convention Center. Cheng Shang presented a poster on “Equivalence between operator spreading and information propagation,” while Tan Van Vu and Tomotaka Kuwahara each gave talks on “Unifying speed limit and Lieb-Robinson bound: Wisdom from optimal transport” and “Clustering of conditional mutual information and quantum Markov structure at arbitrary temperatures,” respectively.
December 2024
Tan Van Vu’s paper “Thermodynamic Unification of Optimal Transport: Thermodynamic Uncertainty Relation, Minimum Dissipation, and Thermodynamic Speed Limits” was selected as one of the Most downloaded papers of 2023 by Physical Review X.
Tan Van Vu also presented a seminar titled “Speed limits meet optimal transport: Applications in quantum many-body systems” at the University of Tokyo’s Hatano Laboratory.
Our laboratory hosted a Christmas party on December 15, 2024.
November 2023
Tomotaka Kuwahara participated in the long-term program “Out-of-equilibrium Dynamics and Quantum Information of Many-body Systems with Long-range Interactions” held at KITP, where he gave an invited lecture on “Optimal light cone and digital quantum simulation of interacting bosons.”
October 2023
Cheng Shang presented a poster on “Equivalence between operator spreading and information propagation” at the 5th International Symposium on Quantum Physics and Quantum Information Sciences (QPQIS-2023) held in Beijing, China, and received the Best Poster Award.
Tomotaka Kuwahara participated in the STS Forum’s Young Leaders Program held in Kyoto in October 2023.
September 2023
Tomotaka Kuwahara attended a long-term program “Quantum Information, Quantum Matter and Quantum Gravity” at Kyoto University’s Institute for Basic Science, where he gave an invited lecture on “Optimal light cone and digital quantum simulation of interacting bosons.”
August 2023
Donghoon Kim, who earned his Ph.D. from KAIST in South Korea, visited our laboratory and presented a seminar on “Entanglement and Screening Cloud in Exotic Quantum Impurity Systems.”
Vanja Maric from Université Paris-Saclay visited our laboratory and presented a seminar on “Universality in the tripartite information after global quenches” in August 2023.
Tomotaka Kuwahara and Tan Van Vu participated in STATPHYS28 held at the University of Tokyo in August 2023, where they presented on “Geometric bounds on heat engines” and “Exponential clustering of bipartite quantum entanglement at arbitrary temperatures,” respectively.
July 2023
Tan Van Vu attended the international conference on quantum thermodynamics (QTD2023) held in Vienna, Austria, where he gave an invited lecture on “Geometric characterization for cyclic heat engines far from equilibrium.”
Yusuke Kimura presented a poster on “Efficiency-guaranteed protocol of simulated quantum annealing” at The Theory of Quantum Computation, Communication, and Cryptography (TQC2023) held in Portugal in July 2023.
April 2023
Cheng Shang, a third-year Ph.D. student from the University of Tokyo’s Hanada Laboratory, joined our team as a RIKEN JRA student.
March 2023
Tomotaka Kuwahara received the RIKEN Baiho Award in March 2023 for his work on ” A no-go theorem for the existence of long-range entanglement at arbitrary temperatures.”
February 2023
Tan Van Vu, a postdoctoral researcher from Keio University’s Saito Laboratory, joined our team as a postdoctoral researcher.
Tomotaka Kuwahara gave a presentation on “Optimal light cone and digital quantum simulation of interacting bosons” at the 26th Conference on Quantum Information Processing (QIP2023) held at Ghent University in Belgium.
Yusuke Kimura, a postdoctoral researcher from the Tokyo Institute of Technology’s Nishimori Laboratory, joined our team as a research scientist in January 2023.
December 2022
Tomotaka Kuwahara delivered an invited lecture on “Sample-efficient Hamiltonian learning of quantum many-body systems” at The 47th Quantum Information Technology Symposium (QIT47).
November 2022
Hideaki Nishikawa, a master’s second-year student from Keio University’s Saito Laboratory, joined our team as a part-timer.
Tomotaka Kuwahara gave an invited lecture on “量子もつれのクラスタリング定理” at the 2022 RANS Symposium held at the RIKEN.
September 2022
Tomotaka Kuwahara lectured on “Lieb-Robinson bound and its applications” at the online international conference Stat&QuantPhys Autumn School 2022 (SQP2022).
August 2022
an article on Tomotaka Kuwahara’s discovery of “「量子もつれ」における重大な性質を新発見” was featured in RIKEN’s Close-up Science 2022.
July 2022
Tomotaka Kuwahara presented a seminar on “Sample-efficient Hamiltonian learning of quantum many-body systems” at Nagoya University’s Francois Le Gall Laboratory.
June 2022
Tomotaka Kuwahara delivered a seminar on “任意温度における二者間エンタングルメントのクラスタリング” at the Gakushuin University Mathematical Physics Seminar.
May 2022
a press release on ” It takes three to tangle: long-range quantum entanglement needs three-way interaction” was published by RIKEN.
April 2022
Tomotaka Kuwahara gave a seminar on “量子ハミルトニアン学習のサンプル複雑性” at the University of Tokyo’s Institute for Solid State Physics.
April 2022: the Quantum Complexity Analysis RIKEN Hakubi Research Team was launched.