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Cavity Quantum Electrodynamics - DOAJ

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Last Updated: 04 January 2023

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Microwave mode cooling and cavity quantum electrodynamics effects at room temperature with optically cooled nitrogen-vacancy center spins

We provide a more complete treatment of optical pumping and dissipation in Nevada centers by accounting for the numerous electronic and spin factors, as well as an investigation of system performance dependent on laser power. We forecast the decline of microwave photon number to 261, about five times lower than the figures released recently. We also forecast the effects of laser pumping on weak-to-strong coupling regimes, and see saturation of these behaviors under heavy laser pumping.

Source link: https://doi.org/10.1038/s41534-022-00642-z


The vacua of dipolar cavity quantum electrodynamics

The relationship of solids and their phases is largely determined by static Coulomb forces, although the coupling of charges to the electromagnetic field's dynamical, i. e. , quantified degrees of freedom plays only a secondary role. Here we present the first comprehensive review of the ground states of a dipolar cavity QED system in the non-perturbative coupling process, where electrostatic and dynamical interactions play an equal role. More specifically, we describe how widespread and long-range vacuum fluctuations influence the states of dipolar matter and lead to novel phases with peculiar properties.

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


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

Quantum information processing is based on fragile superposition states that are sensitive to environmental influences, resulting in mistakes. In addition, the quantum gates are ineffective, so that the use of quantum error correction coding is essential for fault-tolerant computation. We show that arbitrary set of universal quantum gates and gates from Clifford group, which are required in QECC, can be installed based on cavity quantum electrodynamics, as shown in this paper. In addition, the use of the controlled-Z gate rather than the CNOT gate in CQED technologies is more appropriate. We then show that encoders/decoders for quantum low-density parity-check codes can be implemented based on Hadamard and controlled-Z gates that only use CQED. We conduct simulations and evaluate the results of several classes of large-girth quantum LDPC codes suitable for use in CQED technology against those that use lower girth encoding-assisted codes and dual-containing quantum codes.

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


Cavity quantum electrodynamics in application to plasmonics and metamaterials

Frontier quantum engineering tasks necessitate precise control of light-matter interaction dynamics, which can be obtained by introducing electromagnetic structurang. Remarkably, a rigorous quantum mechanical description could refer to those processes in a different way. Although conventional cavity quantum electrodynamics devices are often based on a mode decomposition strategy, few difficulties arise once dispersive and lossy nanostructures, such as noble metals antennas or metamaterials, are involved. The primary goal of this review is to introduce key concepts and techniques while still striving to obtain comprehensive quantum mechanical information of spontaneous, stimulated, and high-order interaction processes tailored to the nanostructured material environment. Although big nanostructured features could be addressed by using fluctuation theorem and the appropriate Green functions' report, smaller objects will require a personal approach. Quantum phenomena, which are both inspired and adapted by nanostructured environment, plays a crucial role in the creation of quantum information equipment and related technologies.

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


Avoiding gauge ambiguities in cavity quantum electrodynamics

Transformations have reshuffled the partition between light and matter degrees of freedom, so level truncation is a gauge dependent approximation. We need to minimize this gauge uncertainty, so we can rewrite the electromagnetic fields in terms of futures for which the resulting canonical timea and Hamiltonian are specifically unchanged by the gauge choice of this theory. Instead, the light-matter partition is assigned 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


Cavity Quantum Electrodynamics of Continuously Monitored Bose-Condensed Atoms

We investigate cavity quantum electrodynamics of Bose-condensed atoms that are exposed to continuous surveillance of the light leaking out of the cavity. In the low excitation threshold, the condensate-u2013cavity device may be used as a sophisticated phonon detector that monitors photons outside of the cavity that have been selectively dispersed by desired phonons.

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


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

One of such events is a u201cparity effectu201d that arises in the stability of an atom coupled to two degenerate cavity field modes by two-photon reactions and appears as a strong dependence on field dynamics, depending on the parity of the initial number of photons. We investigate the physical origins of this phenomenon in the quantum correlations that result in entanglement among the system components' dynamics, which explains why the system evolution is dependent on the parity of the total number of photons.

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

* 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