Quantum coherence in the dynamical Casimir effect

Abstract

We propose to use quantum coherence as ultimate proof of quantum nature in the radiation that appears by means of the Dynamical Casimir Effect in experiments with superconducting microwave waveguides. We show that, unlike previously considered measurements such as entanglement and discord, quantum coherence does not require a threshold value of the external pump amplitude and is highly robust to thermal noise. *

Fifty Years of the Dynamical Casimir Effect

“…This arrangement can be considered as a one-dimensional system with periodically varying distributed parameters. The results of that experiments stimulated many theoretical papers, suggesting further improvements of the experimental schemes [324][325][326][327][328][329][330][331][332][333][334][335][336][337]. The circuit QED with "artificial atoms" (qubits) was the subject of studies [338][339][340][341][342][343][344][345][346][347][348][349][350].…”

“…[143,144,333,346,361,363,[524][525][526][527][528][529][530][531][532][533][534][535][536][537][538][539]. The quantum discord in the DCE was the subject of studies [333,540]. Other aspects of the quantum information theory were investigated in connection with the DCE in [541][542][543].…”

Asymmetric quantum correlations in the dynamical Casimir effect

“…Let us consider the CM 6 of the bipartite Gaussian CV system in the DCE. All the Gaussian properties can be obtained by the CM 14,21,45 whereis the vector of the field quadratures with elements:…”

“…The DCE can produce microwave radiation, which exhibits non-local interaction properties, in the virtual particles of the quantum vacuum 13,14,21,45 . Therefore, the microwave radiation must possess quantum correlations.…”

Entangling Superconducting Qubits through an Analogue Wormhole

“…On the one hand, moving boundary conditions can turn vacuum fluctuations into real particles via the dynamical Casimir effect, which has recently been experimentally observed [10]. These particles are produced in quantum-correlated pairs [11][12][13][14][15]. On the other hand, entanglement can in principle be swapped to qubits [16][17][18][19] after an interaction with the field.…”