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Cavity Quantum Electrodynamics - DOAJ

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Last Updated: 04 August 2022

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Cavity quantum electrodynamics in application to plasmonics and metamaterials

Frontier quantum engineering tasks require precise control of light-matter interaction dynamics, which could be obtained by implementing electromagnetic structurang. The idea of electromagnetic modes' design has gained a lot of attention due to the manufacturing of photonic crystals, micro-resonators, plasmonic nanostructures, and metamaterials, which was prompted by Purcell's finding of spontaneous emission acceleration in a cavity. Remarkably, rigorous quantum mechanical description could refer to those processes in a different manner. Although conventional cavity quantum electrodynamics tools are often based on a mode decomposition strategy, few challenges arise until dispersive and lossy nanostructures, such as noble metals antennas or metamaterials, are involved. Although large nanostructured features could be addressed by applying fluctuation theorem and the associated Green functions' analysis, smaller objects will necessitate individual approach. Quantum phenomena, which are influenced and adapted by a nanostructured environment, plays a significant role in the creation of quantum information systems and related technologies.

Source link: https://doi.org/10.1016/j.revip.2016.07.001


The vacua of dipolar cavity quantum electrodynamics

The relationships of solids and their phases are largely determined by static Coulomb forces, though the coupling of charges to the electromagnetic field's dynamical, i. e. , quantified degrees of freedom plays a secondary role. Here we present a first detailed review of the ground states of a dipolar cavity QED system in the non-perturbative coupling regime, where electrostatic and dynamical interactions play an equal role.

Source link: https://doi.org/10.21468/SciPostPhys.9.5.066


Cavity Quantum Electrodynamics of Continuously Monitored Bose-Condensed Atoms

We investigate cavity quantum electrodynamics of Bose-condensed atoms that are subjected to continual monitoring of the light leaking out of the cavity. The condensate u2013cvity device may be used as a sophisticated phonon detector that detects photons outside the cavity that have been selectively dispersed by desired phonons in the low excitation threshold.

Source link: https://doi.org/10.3390/atoms3030450


Avoiding gauge ambiguities in cavity quantum electrodynamics

When it comes to a few low-lying energy eigenstates, Hamiltonians derived from different gauges may produce different physical results. We can delineate the electromagnetic fields in terms of futures for which the resulting canonical momenta and Hamiltonian are explicitly unchanged by the gauge choice of this theory in order to avoid this gauge ambiguity. Instead, the light/matter partition is given by the intuitive choice of separating an electric field between displacement and polarization contributions.

Source link: https://doi.org/10.1038/s41598-021-83214-z


The physical origin of a photon-number parity effect in cavity quantum electrodynamics

One of these phenomena, however, is a u201cparity effectu201d that arises in the behaviour of an atom coupled to two degenerate cavity field modes by two-photon reactions and manifests itself as a strong dependence of the field dynamics on the parity of the initial number of photons. Here we discuss the physical origins of this phenomenon in the quantum correlations that result in entanglement among the system components, demonstrating why the system evolution is heavily dependent on the parity of the total number of photons.

Source link: https://doi.org/10.1016/j.rinp.2021.104690


Cavity Quantum Electrodynamics (CQED)-Based Quantum LDPC Encoders and Decoders

Quantum information processing is dependent on delicate superposition states that are sensitive to environmental influences, resulting in mistakes. CNOT gates from linear optics provide only probabilistic results and, as such, are not suitable for any meaningful quantum computation. We show that arbitrary set of universal quantum gates and gates from Clifford group, which are needed in QECC, can be installed based on cavity quantum electrodynamics, as shown in this paper. Moreover, in CQED technology, the use of the monitored- Z gate rather than the CNOT gate is more appropriate. We then demonstrate that encoders/decoders for quantum low-density parity-check codes can be programmed and deployed based on Hadamard and controlled-Z gates only using CQED. Finally, we perform simulations and analyze the results of several classes of large-girth quantum LDPC codes suitable for implementation in CQED electronics against those that use lower girth entanglement-assisted codes and dual-containing quantum codes.

Source link: https://doi.org/10.1109/JPHOT.2011.2162315

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions