Anton Frisk Kockum
antonfkockum.bsky.social
Anton Frisk Kockum
@antonfkockum.bsky.social
Quantum physicist (associate professor) at Chalmers University of Technology. Angel investor. Chess player and coach.
New preprint out today with Trond Haug, @timohillmann.bsky.social, and Raphaël Van Laer, at the Wallenberg Centre for Quantum Technology, Chalmers University: 
”Lattice surgery with Bell measurements: Modular fault-tolerant quantum computation at low entanglement cost”
arxiv.org/abs/2510.13541
(1/7)
October 16, 2025 at 6:31 PM
New preprint out today with my Marie Curie postdoc Guangze Chen: ”Efficient three-qubit gates with giant atoms”, arxiv.org/abs/2510.04545
(1/6)
October 7, 2025 at 11:54 AM
New preprint out today with my PhD student Marvin Richter, together with Ingrid Strandberg and Simone Gasparinetti of the 202Q lab, all at the Wallenberg Centre for Quantum Technology at Chalmers:
”Overhead in quantum circuits with time-multiplexed qubit control”
arxiv.org/abs/2508.20752
(1/5)
August 29, 2025 at 11:30 AM
New preprint out today where my PhD student Simon Pettersson Fors and I at WACQT at Chalmers University of Technology, assisted Mustafa Bakr and the team of Peter Leek @ox.ac.uk:

"Intrinsic Multi-Mode Interference for Passive Suppression of Purcell Decay in Superconducting Circuits"
July 15, 2025 at 10:13 AM
New preprint out today in a nice interdisciplinary WACQT-WASP collaboration involving me, @rahmlab.bsky.social, and @smnlssn.bsky.social co-supervising PhD student Hang Zou, combining quantum computing, chemistry, and AI expertise to improve chemistry calculations on quantum computers.
New pre-print from PhD student Hang Zou on warm-starting the variational quantum eigensolver using flows: Flow-VQE! Flow-VQE is parameter transfer on steroids: it learns how to solve a family of related problems, dramatically reducing the aggregate compute cost!
July 3, 2025 at 12:54 PM
New preprint out today with many great co-authors from across Europe: ”Quantum computing and artificial intelligence: status and perspectives”. This white paper discusses and explores the various points of intersection between quantum computing and AI. (1/2)
June 2, 2025 at 1:17 PM
New preprint out today with Tangyou Huang, Akshay Gaikwad, Sorin Paraoanu, Giovanna Tancredi, and many others in the experimental and theory teams at WACQT at Chalmers University of Technology and Aalto University: ”Quantum Process Tomography with Digital Twins of Error Matrices” (1/3)
May 13, 2025 at 9:55 AM
New preprint out today with @basudha.bsky.social, Yinzi Xiao, Ben Criger, and Mats Granath, at WACQT, University of Gothenburg, Chalmers University of Technology, @quantinuum.bsky.social: ”Sequential decoding of the XYZ^2 hexagonal stabilizer code” arxiv.org/abs/2505.03691 (1/2)
May 7, 2025 at 10:11 AM
New preprint out today with Anikesh Patel, Akshay Gaikwad, Tangyou Huang, and Tahereh Abad, all at the Wallenberg Centre for Quantum Technology (WACQT), at Chalmers University of Technology: ”Selective and efficient quantum state tomography for multi-qubit systems”, arxiv.org/abs/2503.20979
March 28, 2025 at 10:27 AM
New preprint out today with the experimental group of Io-Chun Hoi in Hong Kong: ”Tunable coherent microwave beam splitter and combiner at the single-photon level”, arxiv.org/abs/2503.20353
March 27, 2025 at 3:55 PM
I'm giving a talk later today (3:12 pm) at the APS March Meeting, room 161: summit.aps.org/events/MAR-T...

"Fast parametric two-qubit gates for fixed-frequency qubits and tunable couplers, part 1: theory"

Hope to see you there! (1/2)
Superconducting Qubits: Parametric & Tunable Couplings
3:00 pm – 5:36 pm, Thursday March 20, Session MAR-T17, Anaheim Convention Center, 161 (Level 1)
summit.aps.org
March 20, 2025 at 3:16 PM
Another preprint out today, this time with my postdoc Akshay Gaikwad, S. Torres, and S. Ahmed, in WACQT at Chalmers and OpenSuperQPlus100: ”Gradient-descent methods for fast quantum state tomography” arxiv.org/abs/2503.04526. Funding from @kawresearch.bsky.social and @horizoneu.bsky.social. (1/4)
Gradient-descent methods for fast quantum state tomography
Quantum state tomography (QST) is a widely employed technique for characterizing the state of a quantum system. However, it is plagued by two fundamental challenges: computational and experimental com...
arxiv.org
March 7, 2025 at 3:51 PM
New preprint out today with my postdoc @guangzechen.bsky.social at Chalmers University, WACQT: ”Scalable quantum simulator with an extended gate set in giant atoms” arxiv.org/abs/2503.04537. Funding from SSF, @kawresearch.bsky.social, Marie Curie. (1/3)
March 7, 2025 at 1:23 PM