Coherently amplifying photon production from vacuum with a dense cloud of accelerating photodetectors

AbstractAn accelerating photodetector is predicted to see photons in the electromagnetic vacuum. However, the extreme accelerations required have prevented the direct experimental verification of this quantum vacuum effect. In this work, we consider many accelerating photodetectors that are contained within an electromagnetic cavity. We show that the resulting photon production from the cavity vacuum can be collectively enhanced such as to be measurable. The combined cavity-photodetectors system maps onto a parametrically driven Dicke-type model; when the detector number exceeds a certain critical value, the vacuum photon production undergoes a phase transition from a normal phase to an enhanced superradiant-like, inverted lasing phase. Such a model may be realized as a mechanical membrane with a dense concentration of optically active defects undergoing gigahertz flexural motion within a superconducting microwave cavity. We provide estimates suggesting that recent related experimental devices are close to demonstrating this inverted, vacuum photon lasing phase.

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Coherently amplifying photon production from vacuum with a dense cloud of accelerating photodetectors

10.21203/rs.3.rs-135207/v1 ◽

2021 ◽

Author(s):

Hui Wang ◽

Miles Blencowe

Keyword(s):

Phase Transition ◽

Critical Value ◽

Normal Phase ◽

Photon Production ◽

Optically Active ◽

Microwave Cavity ◽

Type Model ◽

Two Level Systems ◽

System Maps ◽

Dense Concentration

Abstract We consider N>>1 accelerating (i.e., oscillating) photodetectors modeled as two level systems (TLSs) that are contained within a microwave cavity and show that the resulting photon production from vacuum can be collectively enhanced such as to be measurable. The cavity-accelerating TLSs system maps onto a parametrically driven Dicke-type model and when the detector number N exceeds a certain critical value, the vacuum photon production undergoes a phase transition from a normal phase to an enhanced superradiant-like, inverted lasing phase. Such a model may be realized as a mechanical membrane with a dense concentration of optically active defects undergoing GHz flexural motion and contained within a 3D, superconducting microwave cavity. We show that recent related experimental devices are close to demonstrating this inverted, vacuum photon lasing phase.

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Effect of the Diamagnetic term in the ultra-strong coupling regime

EPJ Web of Conferences ◽

10.1051/epjconf/201919800011 ◽

2019 ◽

Vol 198 ◽

pp. 00011

Author(s):

Z. Sakhi ◽

A. Chentouf ◽

M. Bennai

Keyword(s):

Wigner Distribution ◽

Critical Value ◽

Normal Phase ◽

Strong Coupling Regime ◽

Wigner Distribution Function ◽

Spontaneous Radiation ◽

Minimal Coupling ◽

Radiation Process ◽

Ground State Wavefunction ◽

Matter Coupling

We consider a set of two level atoms interacting with a single quantized bosonic mode governed by the Dicke model. In this model it is well known that under a critical value of the light-matter coupling a spontaneous radiation process takes place. In the present work, we investigate the dynamics of the system and we study the Wigner distribution function to visualize the effect of the minimal coupling on the ground state wavefunction from the normal phase to the superradiant one. We show also that the entanglement of Bi-partite model is limited by the presence of the diamagnetic term.

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Nonsingular cosmology as a quantum vacuum effect

Physics Letters A ◽

10.1016/0375-9601(79)90117-8 ◽

1979 ◽

Vol 70 (4) ◽

pp. 263-265 ◽

Cited By ~ 41

Author(s):

V.N. Melnikov ◽

S.V. Orlov

Keyword(s):

Quantum Vacuum ◽

Vacuum Effect

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Multiple Cracks of a Thin Film on a Ductile Substrate

MRS Proceedings ◽

10.1557/proc-695-l9.3.1 ◽

2001 ◽

Vol 695 ◽

Author(s):

Ming-Hao Zhao ◽

Ran Fu ◽

Tong-Yi Zhang

Keyword(s):

Thin Film ◽

Residual Stress ◽

Yield Strength ◽

Stress Ratio ◽

Critical Value ◽

Crack Spacing ◽

Type Model ◽

Multiple Cracks ◽

Cracking Resistance ◽

Ductile Substrate

ABSTRACTThe present work proposes a Dugdale type model to theoretically predict the multiple cracks of a residually tensile stressed thin film on a ductile substrate. The results show that there exists a critical value, Rc, of the cracking resistance number, R. When R < R, the film > c cracks and the normalized crack spacing is determined by cracking resistance number and the stress ratio of the residual stress to the yield strength of the substrate.

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EXPERIMENTAL EVIDENCE FOR THE EXISTENCE OF REMANENT SUPERCONDUCTIVITY IN ALUMINIUM AND ITS EFFECT ON THE TEMPERATURE DEPENDENCE OF THE NORMAL PHASE RESISTIVITY

Le Journal de Physique Colloques ◽

10.1051/jphyscol:19786221 ◽

1978 ◽

Vol 39 (C6) ◽

pp. C6-496-C6-497 ◽

Cited By ~ 3

Author(s):

E. Zair ◽

M. Sinvani ◽

B. Levy ◽

A. J. Greenfield

Keyword(s):

Temperature Dependence ◽

Experimental Evidence ◽

Normal Phase

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Normal phase HPLC profiling of the acetylcholinesterase activity in apolar plant extracts

Planta Medica ◽

10.1055/s-0032-1321222 ◽

2012 ◽

Vol 78 (11) ◽

Author(s):

A Landreau ◽

S Bertrand ◽

C Simoes-Pires ◽

L Marcourt ◽

TD Bach ◽

...

Keyword(s):

Plant Extracts ◽

Acetylcholinesterase Activity ◽

Normal Phase ◽

Normal Phase Hplc

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Optical analysis of ink and other contaminants in process waters

TAPPI Journal ◽

10.32964/tj11.8.51 ◽

2012 ◽

Vol 11 (8) ◽

pp. 51-58

Author(s):

ANTTI HAAPALA ◽

MIKA KÖRKKÖ ◽

ELISA KOIVURANTA ◽

JOUKO NIINIMÄKI

Keyword(s):

Optically Active ◽

Process Water ◽

Paper Machine ◽

Optical Analysis ◽

Direct Process ◽

Active Components ◽

Water Contaminants ◽

Dependent Measurement ◽

Measurement Methodology

Analysis methods developed specifically to determine the presence of ink and other optically active components in paper machine white waters or other process effluents are not available. It is generally more interest¬ing to quantify the effect of circulation water contaminants on end products. This study compares optical techniques to quantify the dirt in process water by two methods for test media preparation and measurement: direct process water filtration on a membrane foil and low-grammage sheet formation. The results show that ink content values obtained from various analyses cannot be directly compared because of fundamental issues involving test media preparation and the varied methodologies used to formulate the results, which may be based on different sets of assumptions. The use of brightness, luminosity, and reflectance and the role of scattering measurements as a part of ink content analysis are discussed, along with fine materials retention and measurement media selection. The study concludes with practical tips for case-dependent measurement methodology selection.

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