83 citations · 226 across the 13 of their papers we have counts for
7 papers · 1 filter
Absorption to Fluctuating Bunching States in Non-Unitary Boson Dynamics
Ken Mochizuki, Ryusuke Hamazaki
We show that noisy nonunitary dynamics of bosons drives arbitrary initial states into a novel fluctuating bunching state, where all bosons occupy one time-dependent mode. We propos…
Distinguishability Transitions in Non-Unitary Boson Sampling Dynamics
Ken Mochizuki, Ryusuke Hamazaki
We discover novel transitions characterized by distinguishability of bosons in non-unitary dynamics with parity-time () symmetry. We show that symmetry…
Band structures under non-Hermitian periodic potentials: Connecting nearly-free and bi-orthogonal tight-binding models
Ken Mochizuki, Tomoki Ozawa
We explore band structures of one-dimensional open systems described by periodic non-Hermitian operators, based on continuum models and tight-binding models. We show that imaginary…
Stability of topologically protected edge states in nonlinear quantum walks: Additional bifurcations unique to Floquet systems
Ken Mochizuki, Norio Kawakami, Hideaki Obuse
Recently, effects of nonlinearity on topologically nontrivial systems have attracted attention and the stability of topologically protected edge states has been studied for a quant…
Bulk-edge correspondence and stability of multiple edge states of a symmetric non-Hermitian system by using non-unitary quantum walks
Makio Kawasaki, Ken Mochizuki, Norio Kawakami +1
Topological phases and the associated multiple edge states are studied for parity and time-reversal symmetric non-Hermitian open quantum systems by constructing a…
Effects of disorder on non-unitary symmetric quantum walks
Ken Mochizuki, Hideaki Obuse
symmetry, namely, a combined parity and time-reversal symmetry can make non-unitary quantum walks exhibit entirely real eigenenergy. However, it is known that the co…
Explicit definition of symmetry for non-unitary quantum walks with gain and loss
Ken Mochizuki, Dakyeong Kim, Hideaki Obuse
symmetry, that is, a combined parity and time-reversal symmetry is a key milestone for non-Hermite systems exhibiting entirely real eigenenergy. In the present work,…