Abstract
Future systems for quantum information processing will rely on coherent quantum phenomena, such as the coupling between light and matter. Using a quantum well within a capacitor to study how atomic physics and condensed matter physics are linked, researchers suggest a device architecture for semiconductor-based quantum processing.
Highlights
The strong light-matter coupling regime is a well-known concept in quantum electrodynamics [1]
This occurs when a material excitation reversibly exchanges its energy with an optical mode of a microcavity, and it has so far been realized in numerous physical systems, such as atoms in microwave cavities [2,3], excitons in semiconductor quantum wells (QW) [4] or quantum boxes [5,6], superconducting circuits [7,8,9], and optomecanical resonators [10]
There have been several theoretical studies of the ultrastrong light-matter interaction regime [11,12,13] where the coupling constant, called Rabi frequency, ΩR, becomes comparable with the energy of the material excitation. This regime has been realized experimentally with intersubband transitions coupled with plasmon waveguides in the midinfrared (MIR) [14] and metallic microcavities in the terahertz (THz) frequency range [15,16,17], magnetoplasmons of twodimensional electron gas [18], superconducting qubits [19], and molecular transitions [20]
Summary
The strong light-matter coupling regime is a well-known concept in quantum electrodynamics [1]. No such limitation exists for an electronic circuit resonator built of lump elements with physical sizes that are much smaller than the resonant wavelength [2p8]ffi.ffiffiAs the light-matter coupling constant ΩR scales like 1= V [1,29], it is very interesting to explore and understand the limit towards an arbitrarily small volume This limit is the bases of our quantum-mechanical system consisting of a collection of electronic intersubband dipoles coupled to the oscillating electric field in an “LC” (inductance-capacitor) resonant circuit.
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