pump field
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2021 ◽  
Vol 53 (10) ◽  
Author(s):  
Elnaz Rezaei Benam ◽  
Mostafa Sahrai ◽  
Jafar Poursamad Bonab ◽  
Sohrab Ahmadi-Kandjani

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Shumpei Masuda ◽  
Toyofumi Ishikawa ◽  
Yuichiro Matsuzaki ◽  
Shiro Kawabata

AbstractPumped at approximately twice the natural frequency, a Josephson parametric oscillator called parametron or Kerr parametric oscillator shows self-oscillation. Quantum annealing and universal quantum computation using self-oscillating parametrons as qubits were proposed. However, controls of parametrons under the pump field are degraded by unwanted rapidly oscillating terms in the Hamiltonian, which we call non-resonant rapidly oscillating terms (NROTs) coming from the violation of the rotating wave approximation. Therefore, the pump field can be an intrinsic origin of the imperfection of controls of parametrons. Here, we theoretically study the influence of the NROTs on the accuracy of controls of a parametron: a cat-state creation and a single-qubit gate. It is shown that there is a trade-off relationship between the suppression of the nonadiabatic transitions and the validity of the rotating wave approximation in a conventional approach. We also show that the tailored time dependence of the detuning of the pump field can suppress both of the nonadiabatic transitions and the disturbance of the state of the parametron due to the NROTs.


2021 ◽  
Vol 19 (5) ◽  
pp. 052703
Author(s):  
Yajun Wang ◽  
Yuhang Tian ◽  
Xiaocong Sun ◽  
Long Tian ◽  
Yaohui Zheng
Keyword(s):  

2021 ◽  
Vol 129 (1) ◽  
pp. 127-134
Author(s):  
I. S. Dvuzhilov ◽  
Yu. V. Dvuzhilova ◽  
M. B. Belonenko

Atoms ◽  
2020 ◽  
Vol 8 (3) ◽  
pp. 42
Author(s):  
José Tito Mendonça ◽  
Antonio P. B. Serbêto

We study the collective scattering of radiation by a large ensemble of Na≫1 atoms, in the presence of a pump field. We use the wave-kinetic approach where the center-of-mass position of the moving atoms is described by a microscopic discrete distribution, or alternatively, by a Wigner distribution. This approach can include thermal effects and quantum recoil in a natural way, and even consider atomic ensembles out of equilibrium. We assume two-level atoms with atomic transition frequency ωa very different from the frequency ω0 of the pump field. We consider both the quasi-classical and quantum descriptions of the center-of-mass motion. In both cases, we establish the unstable regimes where coherent emission of radiation can take place.


2020 ◽  
Vol 101 (1) ◽  
Author(s):  
Richard J. Birrittella ◽  
Paul M. Alsing ◽  
Christopher C. Gerry
Keyword(s):  

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