2026 Special QMP Seminar Series

24 Nov 2026, 11:00 → 25 Nov 2026, 16:00 Asia/Taipei

(IoP Building)

Chen-Hsuan Hsu (Institute of Physics, Academia Sinica, Taiwan)

Welcome to the 2026 Special Quantum Materials Physics (QMP) Seminar Series, featuring the following international speakers: 

• Prof. Yohei Fuji (Ritsumeikan Univ, Japan) 

• Prof. Sota Kitamura (Univ Kyoto, Japan)

• Prof. Kazuki Yokomizo (Univ Tokyo, Japan)

 

The event will be hosted at the IoP, Academia Sinica, Taiwan. There is no need for pre-registration to attend these seminars. 

Tuesday 24 November

11:00 → 12:30 Asymptotic Scaling of Precision Limits in Continuous Gaussian Quantum Metrology

Continuous quantum metrology holds promise for achieving high-precision sensing by harnessing information progressively carried away by radiation quanta emitted into the environment. Despite recent progress, a comprehensive understanding of the fundamental precision limits of continuous metrology with bosonic systems is still lacking. In this work, we develop a general theoretical framework for quantum metrology with multimode free bosons under continuous Gaussian measurements. Within this framework, we derive analytical expressions for the asymptotic growth rates of the global quantum Fisher information (QFI) and the environmental QFI, which quantify the total information encoded in the joint system-environment state and the information accessible from the emitted radiation, respectively. We then derive scalings and bounds for these quantities, showing that while a quadratic scaling with the number of modes is attainable, the precision scales at most linearly with time and a meaningful energy resource.

Speaker: Prof. Kazuki Yokomizo (University of Tokyo)

14:30 → 16:00 Effective Hamiltonian approach for monitored Majorana chains

Many-body quantum systems under monitoring of local observables provide a new platform for exploring nonequilibrium phenomena, such as measurement-induced phase transitions and unconventional entanglement phases. In this talk, we introduce an effective Hamiltonian framework for these systems. Taking a monitored version of the Kitaev-Majorana chain as an example, we show that its topological area-law entangled phase exhibits a bulk-edge correspondence in the effective Hamiltonian. We also show that its subvolume-law entangled phase corresponds to the gapless phase of an effective Hamiltonian with correlated long-range hoppings. The effective Hamiltonian thus provides a bridge between monitored dynamics and ground-state physics.

Speaker: Prof. Yohei Fuji (Ritsumeikan University)

Wednesday 25 November

11:00 → 12:30 Role of quantum metric in nonlinear transport

Quantum geometry plays an important role in a variety of transport phenomena in crystalline solids. While its effects on transverse transport have been extensively studied, its role in longitudinal transport remains less well understood. In particular, different theoretical approaches to nonlinear DC transport have led to seemingly conflicting results, raising questions about the underlying physical mechanisms. In this seminar, I present a microscopic framework for nonlinear transport based on adiabatic time evolution and show how the quantum metric gives rise to a nonreciprocal current through a quantum correction to the electronic distribution function. Our results highlight the importance of a microscopic treatment of dissipation, beyond the phenomenological prescriptions commonly employed in nonlinear transport theory.

Speaker: Prof. Sota Kitamura (Kyoto University)