Zobrazeno 1 - 10
of 302
pro vyhledávání: '"Ashhab, S."'
Publikováno v:
Phys. Rev. Research 3, L042007 (2021)
We characterize control of a qutrit implemented in the lowest three energy levels of a capacitively-shunted flux-biased superconducting circuit. Randomized benchmarking over the qutrit Clifford group yields an average fidelity of 98.89 $\pm$ 0.05%. F
Externí odkaz:
http://arxiv.org/abs/2009.00599
Publikováno v:
Phys. Rev. Lett. 125, 180504 (2020)
We have implemented a Walsh-Hadamard gate, which performs a quantum Fourier transform, in a superconducting qutrit. The qutrit is encoded in the lowest three energy levels of a capacitively shunted flux device, operated at the optimal flux-symmetry p
Externí odkaz:
http://arxiv.org/abs/2003.04879
Autor:
Ashhab, S.
Publikováno v:
Phys. Rev. A 101, 023808 (2020)
It has been observed that the asymmetric quantum Rabi model (QRM), which does not possess any obvious symmetry, exhibits energy level crossings, which are often associated with symmetries. This observation suggests that there is in fact a symmetry in
Externí odkaz:
http://arxiv.org/abs/1911.07888
Publikováno v:
Int. J. Quantum Chem. 120, e26053 (2020)
Motivated by the presence of a lattice of rotating molecular dipoles in the high temperature phase of methylammonium lead iodide, we investigate the ground state of a simple cubic lattice of dipoles interacting with each other via the dipole-dipole i
Externí odkaz:
http://arxiv.org/abs/1909.00336
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
Publikováno v:
J. Appl. Phys. 125, 163103 (2019)
Motivated by the recent interest in the possible ordering of the CH$_3$NH$_3$ dipoles in the material CH$_3$NH$_3$PbI$_3$, we investigate the properties of domain boundaries in a simple cubic lattice of dipoles. We perform numerical simulations in wh
Externí odkaz:
http://arxiv.org/abs/1809.06074
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
Publikováno v:
Sci. Rep. 7, 8902 (2017)
The hybrid organic-inorganic lead halide perovskite materials have emerged as remarkable materials for photovoltaic applications. Their strengths include good electric transport properties in spite of the disorder inherent in them. Motivated by this
Externí odkaz:
http://arxiv.org/abs/1703.03574
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
Autor:
Ashhab, S.
Publikováno v:
J. Phys. A: Math. Theor. 50, 134002 (2017)
We analyze the dynamics of a two-level quantum system (TLS) under the influence of a strong sinusoidal driving signal whose origin is the interaction of the two-level system with a quantum field. In this approach the driving field is replaced by a ha
Externí odkaz:
http://arxiv.org/abs/1701.00974