@inproceedings{Leitenstorfer2017Subcy-41331,
  year={2017},
  doi={10.1117/12.2254953},
  title={Subcycle quantum physics (Conference Presentation)},
  number={10102},
  isbn={978-1-5106-0645-6},
  issn={0277-786X},
  publisher={SPIE},
  address={Bellingham},
  series={SPIE Proceedings},
  booktitle={Ultrafast Phenomena and Nanophotonics XXI},
  editor={Betz, Markus and Elezzabi, Abdulhakem Y.},
  author={Leitenstorfer, Alfred},
  note={Article Number: 1010216}
}

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    <dcterms:title>Subcycle quantum physics (Conference Presentation)</dcterms:title>
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    <dc:creator>Leitenstorfer, Alfred</dc:creator>
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    <dcterms:abstract xml:lang="eng">A time-domain approach to quantum electrodynamics is presented, covering the entire mid-infrared and terahertz frequency ranges. Ultrabroadband electro-optic sampling with few-femtosecond laser pulses allows direct detection of the vacuum fluctuations of the electric field in free space [1,2]. Besides the Planck and electric field fundamental constants, the variance of the ground state is determined solely by the inverse of the four-dimensional space-time volume over which a measurement or physical process integrates. Therefore, we can vary the contribution of multi-terahertz vacuum fluctuations and discriminate against the trivial shot noise due to the constant flux of near-infrared probe photons. Subcycle temporal resolution based on a nonlinear phase shift provides signals from purely virtual photons for accessing the ground-state wave function without amplification to finite intensity. Recently, we have succeeded in generation and analysis of mid-infrared squeezed transients with quantum noise patterns that are time-locked to the intensity envelope of the probe pulses. We find subcycle temporal positions with a noise level distinctly below the bare vacuum which serves as a direct reference. Delay times with increased differential noise indicate generation of highly correlated quantum fields by spontaneous parametric fluorescence. Our time-domain approach offers a generalized understanding of spontaneous emission processes as a consequence of local anomalies in the co-propagating reference frame modulating the quantum vacuum, in combination with the boundary conditions set by Heisenberg’s uncertainty principle. [1] C. Riek et al., Science 350, 420 (2015) [2] A. S. Moskalenko et al., Phys. Rev. Lett. 115, 263601 (2015)</dcterms:abstract>
    <dc:contributor>Leitenstorfer, Alfred</dc:contributor>
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