Journal of Physics B: Atomic, Molecular and Optical Physics

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ISSN / EISSN : 0953-4075 / 1361-6455
Published by: IOP Publishing (10.1088)
Total articles ≅ 16,315
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, Mohammed Daoud,
Journal of Physics B: Atomic, Molecular and Optical Physics; https://doi.org/10.1088/1361-6455/ac24ad

Abstract:
This work concerns a three-qubit processor implemented as three transmon-type superconducting qubits capacitively coupled to a superconducting resonator driven by a microwave field. Based on an effective Hamiltonian of this system, we propose a scheme to realize an X-rotation gate for three qubits requiring only a single-step operation. During the gate operation, the cavity photon-number is canceled due to the strong microwave field. It does not require the cavity to be initially in the vacuum state and the scheme is insensitive to cavity decay. We also present an effective scheme to implement Grover's search algorithm based on this quantum gate and a phase oracle. Using numerical simulation and analysis, we show that the proposed schemes allow for efficiently finding the target state with a high fidelity.
Germann Hergert, Andreas Wöste, , Christoph Lienau
Journal of Physics B: Atomic, Molecular and Optical Physics; https://doi.org/10.1088/1361-6455/ac2471

Abstract:
The interaction of swift, free-space electrons with confined optical near fields has recently sparked much interest. It enables a new type of photon-induced near-field electron microscopy, mapping local optical near fields around nanoparticles with exquisite spatial and spectral resolution and lies at the heart of quantum state manipulation and attosecond pulse shaping of free electrons. The corresponding interaction of optical near fields with slow electrons has achieved much less attention, even though the lower electron velocity may enhance electron-near-field coupling for small nanoparticles. A first-principle theoretical study of such interactions has been reported very recently [N. Talebi, Phys. Rev. Lett. 125, 080401 (2020)]. Building up on this work, we investigate, both analytically and numerically, the inelastic scattering of slow electrons by near fields of small nanostructures. For weak fields, this results in distinct angular diffraction patterns that represent, to first order, the Fourier transform of the transverse variation of the scalar near-field potential along the direction perpendicular to the electron propagation. For stronger fields, scattering by the near-field component along the electron trajectory results in a break-up of the energy spectrum into multiple photon orders. Their angular diffraction patterns are given by integer powers of the Fourier transform of the transverse potential variation and are shifting in phase with photon order. Our analytical model offers an efficient approach for studying the effects of electron kinetic energy, near field shape and strength on the diffraction and thus may facilitate the experimental observation of these phenomena by, e.g., ultrafast low-energy point-projection microscopy or related techniques. This could provide simultaneous access to different vectorial components of the optical near fields of small nanoparticles.
Homar Rivera,
Journal of Physics B: Atomic, Molecular and Optical Physics; https://doi.org/10.1088/1361-6455/ac2472

Abstract:
A ground state atom immersed in the wave function of the valence electron of a Rydberg atom can generate a long-range Rydberg molecule (LRRM). In this work, using the multipole expansion of the electrostatic interaction in prolate spheroidal coordinates, approximate and compact expressions of the electrostatic potential that determine the chemistry of trilobite and butterfly LRRM are explored. It is shown that even the prolate spheroidal monopole term can be used to describe general features of the potential generated by a LRRM at short distances. It is also shown that even at long separations that allow a perturbative description of the intermolecular interaction between two LRRM, the convergence of the multipole prolate spheroidal expansion is faster than that of its spherical analogue.
Xi Chen, , Zhiting Li, Yanhong Liu, Kang Mi, Qingbin Zhang, Peixiang Lu
Journal of Physics B: Atomic, Molecular and Optical Physics; https://doi.org/10.1088/1361-6455/ac20bd

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