205 citations · 3.3k across the 120 of their papers we have counts for
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Quantum weak invariants: Dynamical evolution of fluctuations and correlations
Zeyi Shi, Sumiyoshi Abe
Weak invariants are time-dependent observables with conserved expectation values. Their fluctuations, however, do not remain constant in time. On the assumption that time evolution…
Fast-forward scheme reexamined: Choice of time and quantization
Sumiyoshi Abe
The fast-forward scheme for accelerating time evolution of quantum states through change of time is reexamined. Dirac's homogeneous formalism for classical dynamics and canonical q…
Growing fluctuation of quantum weak invariant and dissipation
Sumiyoshi Abe
The concept of weak invariants has recently been introduced in the context of conserved quantities in finite-time processes in nonequilibrium quantum thermodynamics. A weak invaria…
Action principle and weak invariants
Sumiyoshi Abe, Congjie Ou
A weak invariant associated with a master equation is characterized in such a way that its spectrum is not constant in time but its expectation value is conserved under time evolut…
Estimating entanglement in a class of N-qudit states
Sumiyoshi Abe
The logarithmic derivative (or, quantum score) of a positive definite density matrix appearing in the quantum Fisher information is discussed, and its exact expression is presented…
Time evolution of Renyi entropy under the Lindblad equation
Sumiyoshi Abe
In recent years, the Renyi entropy has repeatedly been discussed for characterization of quantum critical states and entanglement. Here, time evolution of the Renyi entropy is stud…