Quantum sensing and applications for physics

Thursday 30 Oct 2025, 09:00 → 17:00 Asia/Taipei

Chien-Shiung Building (Physics Building) room 209 (National Central University)

Overview

 There are new detector proposals and R&D that utilize quantum enhancements not previously adopted. Examples include superconducting quantum sensors, atom interferometry, and quantum spin sensors. They are mainly motivated by industrial applications toward quantum computing, secure quantum communication systems, and high-sensitivity sensors. Given the excellent potential of the new quantum sensing, there are also new proposals to apply them in various academic areas including particle physics and cosmology. This one-day workshop has a special guest, Prof. Yuichiro Matsuzaki of Chuo University, Japan, and aims to gather scientists in quantum information science (QIS), gravitational wave physics, cosmology, and other areas of physics to discuss new quantum sensing and applications for physics.

Organizers

Masashi Hazumi (KEK, NCU), Yuki Inoue (NCU)

Sponsors

This workshop is sponsored by the Center for High Energy and High Field Physics (CHiP) and is supported by the Physical Society of Taiwan (TPS).

09:30 Registration and Welcome Coffee

1 Welcome and Purpose of the Mini-Workshop

Speaker: Masashi Hazumi (National Central University)

2 Enhancing the Dynamic Range of Quantum Sensing via Quantum Circuit Learning

abstract: Quantum metrology is a promising application of quantum technologies, enabling the precise measurement of weak external fields at a local scale. In typical quantum sensing protocols, a qubit interacts with an external field, and the amplitude of the field is estimated by analyzing the expectation value of a measured observable. Sensitivity can, in principle, be enhanced by increasing the number of qubits within a fixed volume, thereby maintaining spatial resolution. However, at high qubit densities, inter-qubit interactions induce complex many-body dynamics, resulting in multiple oscillations in the expectation value of the observable even for small field amplitudes. This ambiguity reduces the dynamic range of the sensing protocol. We propose a method to overcome the limitation in quantum metrology by adopting a quantum circuit learning framework using a parameterized quantum circuit to approximate a target function by optimizing the circuit parameters. In our method, after the qubits interact with the external field, we apply a sequence of parameterized quantum gates and measure a suitable observable. By optimizing the gate parameters, the expectation value is trained to exhibit a monotonic response within a target range of field amplitudes, thereby eliminating multiple oscillations and enhancing the dynamic range. This method offers a strategy for improving quantum sensing performance in dense qubit systems.

Kawaguchi, H., Mori, Y., Satoh, T., & Matsuzaki, Y. (2025). Enhancing the Dynamic Range of Quantum Sensing via Quantum Circuit Learning. arXiv preprint arXiv:2505.04958.

Speaker: Prof. Yuichiro Matsuzaki (Chuo University)

3 Quantum Sensing at the CHRONOS Project

Speaker: Yuki Inoue (National Central University)

4 Photo session

12:20 Lunch

5 Light Dark Matter Search with Nitrogen-Vacancy Centers in Diamonds

Speaker: Masashi Hazumi (National Central University)

6 Quantum speed limits and selected applications in quantum many-body physics and quantum information science

Speaker: Prof. Jyong-Hao Chen (National Central University)

7 Development of Josephson Parametric Amplifiers for Axion Search and Quantum Information Applications

Speaker: Prof. Yung-Fu Chen (National Central University)

15:30 Coffee Break

8 Quantum Technology Strategy in Taiwan

Speaker: TBD

9 Free Discussion on Future Directions