Zobrazeno 1 - 10
of 1 144
pro vyhledávání: '"semba, K."'
Publikováno v:
Phys. Rev. A 99, 063822 (2019)
We calculate the transmission spectrum of a superconducting circuit realization of the Dicke model and identify spectroscopic features that can serve as signatures of the superradiant phase. In particular, we calculate the resonance frequencies of th
Externí odkaz:
http://arxiv.org/abs/1903.10727
Autor:
Xiao, Z., Fuse, T., Ashhab, S., Yoshihara, F., Semba, K., Sasaki, M., Takeoka, M., Dowling, J. P.
Publikováno v:
Phys. Rev. A 99, 013827 (2019)
We study a qubit-oscillator system, with a time-dependent coupling coefficient, and present a scheme for generating entangled Schr\"odinger-cat states with large mean photon numbers and also a scheme that protects the cat states against dephasing cau
Externí odkaz:
http://arxiv.org/abs/1807.04927
Autor:
Ashhab, S., Semba, K.
Publikováno v:
Phys. Rev. A 95, 053833 (2017)
We theoretically analyze the effect of parameter fluctuations on the superradiance phase transition in a setup where a large number of superconducting qubits are coupled to a single cavity. We include parameter fluctuations that are typical of superc
Externí odkaz:
http://arxiv.org/abs/1701.08984
Quantum feedback is a technique for measuring a qubit and applying appropriate feedback depending on the measurement results. Here, we propose a new on-chip quantum feedback method where the measurement-result information is not taken from the chip t
Externí odkaz:
http://arxiv.org/abs/1509.00580
Autor:
Cai, H., Matsuzaki, Y., Kakuyanagi, K., Toida, H., Zhu, X., Mizuochi, N., Nemoto, K., Semba, K., Munro, W. J., Saito, S., Yamaguchi, H.
A hybrid system that combines the advantages of a superconducting flux qubit and an electron spin ensemble in diamond is one of the promising devices to realize quantum information processing. Exploring the properties of the superconductor diamond sy
Externí odkaz:
http://arxiv.org/abs/1505.07558
We have controlled the measurement strength of the qubit readout process by using a Josephson bifurcation amplifier (JBA : an AC-driven SQUID). The optimum readout pulse changes the superposition state into an eigenstate. To clarify how a sufficientl
Externí odkaz:
http://arxiv.org/abs/1004.0182
Autor:
Morishita, H., Vlasenko, L. S., Tanaka, H., Semba, K., Sawano, K., Shiraki, Y., Eto, M., Itoh, K. M.
Electron paramagnetic resonance of ensembles of phosphorus donors in silicon has been detected electrically with externally applied magnetic fields lower than 200 G. Because the spin Hamiltonian was dominated by the contact hyperfine term rather than
Externí odkaz:
http://arxiv.org/abs/0907.0769
Publikováno v:
Phys. Rev. B 80, 224509 (2009)
In this paper we present an experimentally realizable microwave pulse sequence that effects a Controlled NOT (C-NOT) gate operation on a Josephson junction-based flux-qubit/resonator system with high fidelity in the end state. We obtained a C-NOT gat
Externí odkaz:
http://arxiv.org/abs/0904.0933
Publikováno v:
PHYSICAL REVIEW B 80, 144508 (2009)
We study the role of qubit dephasing in cooling a mechanical resonator by quantum back-action. With a superconducting flux qubit as a specific example, we show that ground-state cooling of a mechanical resonator can only be realized if the qubit deph
Externí odkaz:
http://arxiv.org/abs/0812.0261
Publikováno v:
Phys. Rev. B, 79, 024502 (2009)
We propose a scheme with dc-control of finite bandwidth to implement two-qubit gate for superconducting flux qubits at the optimal point. We provide a detailed non-perturbative analysis on the dynamic evolution of the qubits interacting with a common
Externí odkaz:
http://arxiv.org/abs/0807.1584