45 citations · 75 across the 5 of their papers we have counts for
7 papers
Quantum Thermodynamics applied for Quantum Refrigerators cooling down a qubit
Hideaki Okane, Shunsuke Kamimura, Shingo Kukita +2
We discuss a quantum refrigerator to increase the ground state probability of a target qubit whose energy difference between the ground and excited states is less than the thermal…
Heisenberg-limited quantum metrology using collective dephasing
Shingo Kukita, Yuichiro Matsuzaki, Yasushi Kondo
The goal of quantum metrology is the precise estimation of parameters using quantum properties such as entanglement. This estimation usually consists of three steps: state preparat…
Controllable non-Markovianity in phase relaxation
Shingo Kukita, Yasushi Kondo, Mikio Nakahara
Recently remarkable progress in quantum technology has been witnessed. In view of this it is important to investigate an open quantum system as a model of such quantum devices. Qua…
An upper bound on the number of compatible parameters in simultaneous quantum estimation
Shingo Kukita
Simultaneous estimation of multiple parameters is required in many practical applications. A lower bound on the variance of simultaneous estimation is given by the quantum Fisher i…
Harvesting large scale entanglement in de Sitter space with multiple detectors
Shingo Kukita, Yasusada Nambu
We consider entanglement harvesting in de Sitter space using a model of multiple qubit detectors. We obtain the formula of the entanglement negativity for this system. Applying the…
Entanglement dynamics in de Sitter spacetime
Shingo Kukita, Yasusada Nambu
We apply the master equation with dynamical coarse graining approximation to a pair of detectors interacting with a scalar field. By solving the master equation numerically, we inv…