4 papers
Renormalization of Quantum Operations: Parity-Time Transition and Chaotic Flows
Atsushi Oyaizu, Hongchao Li, Masaya Nakagawa +1
The renormalization group (RG) in statistical physics focuses on ground-state properties of equilibrium systems. However, it is unclear how it should be generalized to nonunitary q…
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…
Dissipative Superfluidity in a Molecular Bose-Einstein Condensate
Hongchao Li, Xie-Hang Yu, Masaya Nakagawa +1
Motivated by recent experimental realization of a Bose-Einstein condensate (BEC) of dipolar molecules, we develop superfluid transport theory for a dissipative BEC to show that a w…
Optimizing digital quantum simulation of open quantum lattice models
Xie-Hang Yu, Hongchao Li, J. Ignacio Cirac +1
Many-body systems arising in condensed matter physics and quantum optics inevitably couple to the environment and need to be modelled as open quantum systems. While near-optimal al…