234 citations · 823 across the 22 of their papers we have counts for
21 papers · 1 filter
Vertically Coupled Double Quantum Dots Connected In Parallel
Shinichi Amaha, Tsuyoshi Hatano, Takashi Nakajima +1
We report charge transport measurements in a ring-shaped quadruple quantum dot system, composed of two vertically coupled double quantum dots connected in parallel. The vertical co…
Coexistence of parallel and series current paths in parallel-coupled double quantum dots in nonlinear transport regime
Tsuyoshi Hatano, Toshihiro Kubo, Shinichi Amaha +2
We investigated the electron transport properties of parallel-coupled double quantum dot (DQD) devices under magnetic fields. When a low magnetic field was applied, electron tunnel…
Thermally assisted Pauli spin blockade in double quantum dots
M. Kondo, S. Miyota, W. Izumida +2
We investigate the influence of thermal energy on the current flow and electron spin states in double quantum dots in series. The quadruplet Pauli spin blockade, which is caused by…
Quantum nondemolition measurement of an electron spin qubit
Takashi Nakajima, Akito Noiri, Jun Yoneda +11
Measurement of quantum systems inevitably involves disturbance in various forms. Within the limits imposed by quantum mechanics, however, one can design an "ideal" projective measu…
Difference in charge and spin dynamics in a quantum dot-lead coupled system
Tomohiro Otsuka, Takashi Nakajima, Matthieu R. Delbecq +12
We analyze time evolution of charge and spin states in a quantum dot coupled to an electric reservoir. Utilizing high-speed single-electron detection, we focus on dynamics induced…
Four single-spin Rabi oscillations in a quadruple quantum dot
Takumi Ito, Tomohiro Otsuka, Takashi Nakajima +9
Scaling up qubits is a necessary step to realize useful systems of quantum computation. Here we demonstrate coherent manipulations of four individual electron spins using a micro-m…