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quant-ph2026
Ward-Takahashi Identity and Gauge-Invariant Response Theory for Open Quantum Systems
Hongchao Li, Xie-Hang Yu, Masaya Nakagawa +1
We derive the Ward-Takahashi identity and establish the gauge-invariant response theory for open quantum systems described by Lindbladians to show that particle-number conservation…
quant-ph2026
Non-Hermitian Renormalization Group from a Few-Body Perspective
Hiroyuki Tajima, Masaya Nakagawa, Haozhao Liang +1
Non-Hermiticity plays a fundamental role in open quantum systems and describes a wide variety of effects of interactions with environments, including quantum measurement. However,…
quant-ph2024
Quantum master equation for many-body systems: Derivation based on the Lieb-Robinson bound
Koki Shiraishi, Masaya Nakagawa, Takashi Mori +1
The local Gorini-Kossakowski-Sudarshan-Lindblad (GKSL) quantum master equation is a powerful tool for the study of open quantum many-body systems. However, its microscopic derivati…