Zobrazeno 1 - 10
of 104
pro vyhledávání: '"Koshino, Kazuki"'
Autor:
Goto, Shimpei, Koshino, Kazuki
We propose a new method for labeling the eigenstates of qubit-cavity systems based on the continuity of the qubit occupancy. The labeled eigenstates give a rough estimation of the evolution of a quantum state under cavity driving. The photon-number d
Externí odkaz:
http://arxiv.org/abs/2401.16666
Autor:
Kim, Byunggi, Kurokawa, Hodaka, Sakai, Katsuta, Koshino, Kazuki, Kosaka, Hideo, Nomura, Masahiro
Publikováno v:
Phys. Rev. Applied 20, 044037 (2023)
Quantum transduction between microwave and optical photons plays a key role in quantum communication among remote qubits. Although the quantum transduction schemes generating communication photons have been successfully demonstrated by using optomech
Externí odkaz:
http://arxiv.org/abs/2305.08306
Autor:
Goto, Shimpei, Koshino, Kazuki
Publikováno v:
Phys. Rev. A 108, 033722 (2023)
We develop an efficient numerical approach for simulating the high-power dispersive readout in circuit quantum electrodynamics. In the numerical simulations of the high-power readout, a large-amplitude coherent state induced in a cavity is an obstacl
Externí odkaz:
http://arxiv.org/abs/2305.00628
Autor:
Koshino, Kazuki, Inomata, Kunihiro
The number of superconducting qubits contained in a single quantum processor is increasing steadily. However, to realize a truly useful quantum computer, it is inevitable to increase the number of qubits much further by distributing quantum informati
Externí odkaz:
http://arxiv.org/abs/2302.04548
We investigate the stimulated emission of superradiant atoms coupled to a waveguide induced by a coherent-state photon pulse. We provide an analytical result when a short $\pi$ pulse is incident, which shows that the atoms emit photons coherently int
Externí odkaz:
http://arxiv.org/abs/2203.06943
Autor:
Iakoupov, Ivan, Koshino, Kazuki
Publikováno v:
Phys. Rev. Research 5, 013148 (2023)
We consider a typical circuit QED setup where an artificial atom encodes a qubit and is dispersively coupled to a measurement resonator that in turn is coupled to a transmission line. We show theoretically that by placing another artificial atom in t
Externí odkaz:
http://arxiv.org/abs/2202.07229
Publikováno v:
Phys. Rev. Research 4, 013013 (2022)
In ultra- and deep-strong cavity quantum electrodynamics (QED) systems, many intriguing phenomena that do not conserve the excitation number are expected to occur. In this study, we theoretically analyze the optical response of an ultrastrong cavity-
Externí odkaz:
http://arxiv.org/abs/2109.02764
Autor:
Koshino, Kazuki
Publikováno v:
Phys. Rev. Research 3, 023060 (2021)
We investigate optical response of a linear waveguide quantum electrodynamics (QED) system, namely, an optical cavity coupled to a waveguide. Our analysis is based on exact diagonalization of the overall Hamiltonian and is therefore rigorous even in
Externí odkaz:
http://arxiv.org/abs/2101.02845
Autor:
Masuda, Shumpei, Koshino, Kazuki
A Josephson quantum filter (JQF) protects a data qubit (DQ) from the radiative decay into transmission lines in superconducting quantum computing architectures. A transmon, which is a weakly nonlinear harmonic oscillator rather than a pure two-level
Externí odkaz:
http://arxiv.org/abs/2008.09980
Autor:
Shitara, Tomohiro, Bamba, Motoaki, Yoshihara, Fumiki, Fuse, Tomoko, Ashhab, Sahel, Semba, Kouichi, Koshino, Kazuki
Publikováno v:
New J. Phys. 23, 103009 (2021)
We investigate theoretically how the ground state of a qubit-resonator system in the deep-strong coupling (DSC) regime is affected by the coupling to an environment. We employ as a variational ansatz for the ground state of the qubit-resonator-enviro
Externí odkaz:
http://arxiv.org/abs/2006.16769