Reflection and transmission of electromagnetic pulses at a planar dielectric interface -- theory and quantum lattice simulations

Abstract

There is considerable interest in the application of quantum information science to advance computations in plasma physics. Many of the topics in fusion plasma physics are classical in nature. In order to implement them on quantum computers it will require couching a classical problem in the language of quantum mechanics. Electromagnetic waves are routinely used in fusion experiments. The propagation of electromagnetic waves is described by Maxwell equations with an appropriate description of the plasma as a dielectric medium. Before advancing to the tensor dielectric of a magnetized plasma, this paper considers wave propagation in a one-dimensional inhomogeneous scalar dielectric. The classic theory of scattering of plane electromagnetic waves at a planar interface, separating two different dielectric media, leads to Fresnel equations for reflection and transmission coefficients. In contrast to plane waves, this paper is on the reflection and transmission of a spatially confined electromagnetic pulse. An analytical formulation for the scattering of a Gaussian pulse shows that the maximum transmission coefficient is modified by the square-root of the ratio of the two permittivities. The theory is complemented by numerical simulations using a quantum lattice algorithm for Maxwell equations. The algorithm, based on the Riemann-Silberstein-Weber representation of the electromagnetic fields and expressed in term of qubits, is an interleaved sequence of entangling operators at each lattice site and unitary streaming operators which transmit information from one site to an adjacent lattice site. Besides substantiating results from the theory for Gaussian pulses, numerical simulations show their validity for non-Gaussian pulses.

27 pages, 10 figures

References in corpus (2)

• The role of the Riemann-Silberstein vector in classical and quantum theories of electromagnetism
• Electromagnetism as Quantum Physics

Cited by in corpus (8)

• Dyson Maps and Unitary Evolution for Maxwell Equations in Tensor Dielectric Media
• Quantum Computing Perspective for Electromagnetic Wave Propagation in Cold Magnetized Plasmas
• Quantum Lattice Representation for the Curl Equations of Maxwell Equations
• Simulation of linear non-Hermitian boundary-value problems with quantum singular value transformation
• Quantum simulation of dissipation for Maxwell equations in dispersive media
• A new matrix representation of the Maxwell equations based on the Riemann-Silberstein-Weber vector for a linear inhomogeneous medium
• Some Comments on Unitary Qubit Lattice Algorithms for Classical Problems
• The effect of the width of the incident pulse to the dielectric transition layer in the scattering of an electromagnetic pulse -- a quantum lattice algorithm simulation