Probing the Purcell effect without radiative decay: lessons in the frequency and time domains

Lindel, Frieder; Settembrini, Francesca Fabiana; Bennett, Robert; Buhmann, Stefan Yoshi

doi:10.1088/1367-2630/ac434e

Cited by 5 publications

(3 citation statements)

References 30 publications

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“…In this way, as we show in Supplementary Note 2 building upon previous theoretical works 21 – 24 , the experiment measures the following quantity which has been normalized by the detector efficiency such that it has field units: Equation ( 2 ) has an intuitive interpretation which closely connects our experiment to Fermi’s two-atom system in Fig. 1a as discussed before.…”

Section: Resultsmentioning

confidence: 91%

Detection of quantum-vacuum field correlations outside the light cone

et al. 2022

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According to quantum field theory, empty space—the ground state with all real excitations removed—is not empty, but filled with quantum-vacuum fluctuations. Their presence can manifest itself through phenomena such as the Casimir force, spontaneous emission, or dispersion forces. These fluctuating fields possess correlations between space-time points outside the light cone, i.e. points causally disconnected according to special relativity. As a consequence, two initially uncorrelated quantum objects in empty space which are located in causally disconnected space-time regions, and therefore unable to exchange information, can become correlated. Here, we have experimentally demonstrated the existence of correlations of the vacuum fields for non-causally connected space-time points by using electro-optic sampling. This result is obtained by detecting vacuum-induced correlations between two 195 fs laser pulses separated by a time of flight of 470 fs. This work marks a first step in analyzing the space-time structure of vacuum correlations in quantum field theory.

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Section: Resultsmentioning

confidence: 91%

Detection of quantum-vacuum field correlations outside the light cone

et al. 2022

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“…An expanded scheme, implemented first for subcycle measurements of intensity correlations from a THz quantum cascade laser close to the lasing threshold [7], is capable of resolving the temporal and spatial correlations of quantum fields [8], see figure 2. Furthermore, the changes of the THz quantum vacuum induced by a perfectly reflecting plate or by a plate possessing a surface plasmon polariton were studied in this configuration [9]. Options to sample not only the electric component of the propagating quantum field but also its second generalized conjugated quadrature [10,11] have been discovered recently [12,13], paving the way towards a new type of quantum tomography operating completely in the time domain.…”

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confidence: 99%

The 2023 terahertz science and technology roadmap

Dhillon¹,

Vitiello²,

Linfield³

et al. 2023

J. Phys. D: Appl. Phys.

184

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Terahertz (THz) radiation encompasses a wide spectral range within the electromagnetic spectrum that extends from microwaves to the far infrared (100 GHz to ~30 THz). Within its frequency boundaries exist a broad variety of scientific disciplines that have presented, and continue to present, technical challenges to researchers. During the past 50 years, for instance, the demands of the scientific community have substantially evolved and with a need for advanced instrumentation to support radio astronomy, Earth observation, weather forecasting, security imaging, telecommunications, non-destructive device testing and much more. Furthermore, applications have required an emergence of technology from the laboratory environment to production-scale supply and in-the-field deployments ranging from harsh ground-based locations to deep space. In addressing these requirements, the research and development community has advanced related technology and bridged the transition between electronics and photonics that high frequency operation demands. The multidisciplinary nature of THz work was our stimulus for creating the 2017 THz Science and Technology Roadmap (S S Dhillon et al 2017 J. Phys. D: Appl. Phys. 50 043001). As one might envisage, though, there remains much to explore both scientifically and technically and the field has continued to develop and expand rapidly. It is timely, therefore, to revise our previous roadmap and in this 2023 version we both provide an update on key developments in established technical areas that have important scientific and public benefit, and highlight new and emerging areas that show particular promise. The developments that we describe thus span from fundamental scientific research, such as THz astronomy and the emergent area of THz quantum optics, to highly applied and commercially and societally impactful subjects that include 6G THz communications, medical imaging, and climate monitoring and prediction.

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“…Since this can be achieved in both the temporal and the spatial domain, this opened up studies about the very nature of these peculiar states. Theoretical proposals were made to probe fundamental hypotheses in special relativity in a table-top experiment using electro-optic sampling Moskalenko et al, 2015;Guedes et al, 2019: realising Riek et al, 2017. On the counter side, a very recent theoretical work shows that sub-cycle metrology of terahertz fields may provide information about spatio-temporal properties of dispersive coupled light-matter systems De Liberato., 2019, about the Purcell effect Lindel et al, 2022, or quantum susceptibilities Kizmann et al, 2022 Despite this initial progress, measuring all degrees of freedom of quantum states of light in the terahertz remains a laborious and challenging task. In this perspective, we discuss-by virtue of contrast-the advantages of electro-optic sampling as opposed to narrowband up-conversion techniques from a fundamental point of view.…”

Section: Introductionmentioning

confidence: 99%

Resolving sub-cycle signatures: A perspective on hallmarks of terahertz metrology

Benea-Chelmus

Tomasino

2023

Front. Photon.

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Frequency up-conversion has become amongst the most prevalent techniques for detection of terahertz waves in metrology systems. State-of-the-art up-conversion techniques rely on the coherent transferring of the information encoded in all degrees of freedom of a terahertz wave to either the near-infrared or visible domain, where detectors are readily accessible. This allows for an indirect reconstruction of the terahertz wave. However, unlike most up-conversion methods employed in photonics which are concentrating on narrowband tones (at both terahertz and near-infrared frequencies), a broadband, hence temporally constrained, terahertz transient is sampled on time-scales shorter than its oscillation period. Here, femtosecond laser pules serve as temporal gates. In this perspective, we highlight several hallmarks of terahertz metrology that originate from these sub-cycle measurement capabilities and elaborate why this enables studies in fundamental and applied science, with a particular focus on novel measurement concepts in classical and quantum. We focus on so-far demonstrated detection performance in bulk non-linear crystals. Finally, we discuss current challenges and the most pressing questions ahead.

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Probing the Purcell effect without radiative decay: lessons in the frequency and time domains

Cited by 5 publications

References 30 publications

Detection of quantum-vacuum field correlations outside the light cone

Detection of quantum-vacuum field correlations outside the light cone

The 2023 terahertz science and technology roadmap

Resolving sub-cycle signatures: A perspective on hallmarks of terahertz metrology

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