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dc.contributor.author
Benea-Chelmus, Ileana-Cristina
dc.contributor.author
Settembrini, Francesca F.
dc.contributor.author
Scalari, Giacomo
dc.contributor.author
Faist, Jérôme
dc.date.accessioned
2024-06-12T14:08:51Z
dc.date.available
2019-04-22T02:59:27Z
dc.date.available
2019-04-23T14:45:36Z
dc.date.available
2024-06-12T14:08:51Z
dc.date.issued
2019-04-11
dc.identifier.issn
0028-0836
dc.identifier.issn
1476-4687
dc.identifier.other
10.1038/s41586-019-1083-9
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/338859
dc.identifier.doi
10.3929/ethz-b-000338859
dc.description.abstract
Quantum mechanics ascribes to the ground state of the electromagnetic radiation zero-point electric field fluctuations that permeate empty space at all frequencies. No energy can be extracted from the ground state of a system, and therefore these fluctuations cannot be measured directly with an intensity detector. The experimental proof of their existence therefore came from more indirect evidence, such as the Lamb shift, the Casimir force between close conductors or spontaneous emission. A direct method of determining the spectral characteristics of vacuum field fluctuations has so far been missing. Here we perform a direct measurement of the field correlation on these fluctuations in the terahertz frequency range by using electro-optic detection in a nonlinear crystal placed in a cryogenic environment. We investigate their temporal and spatial coherence, which, at zero time delay and spatial distance, has a peak value of 6.2 × 10−2 volts squared per square metre, corresponding to a fluctuating vacuum field of 0.25 volts per metre. With this measurement, we determine the spectral components of the ground state of electromagnetic radiation within the bandwidth of our electro-optic detection.
en_US
dc.format
application/pdf
en_US
dc.language.iso
en
en_US
dc.publisher
Nature
en_US
dc.rights.uri
http://rightsstatements.org/page/InC-NC/1.0/
dc.title
Electric field correlation measurements on the electromagnetic vacuum state
en_US
dc.type
Other Journal Item
dc.rights.license
In Copyright - Non-Commercial Use Permitted
dc.date.published
2019-04-10
ethz.journal.title
Nature
ethz.journal.volume
568
en_US
ethz.journal.issue
7751
en_US
ethz.pages.start
202
en_US
ethz.pages.end
206
en_US
ethz.version.deposit
publishedVersion
en_US
ethz.notes
It was possible to publish this article open access thanks to a Swiss National Licence with the publisher.
en_US
ethz.grant
Monolithic, self referenced quantum cascade laser frequency comb
en_US
ethz.identifier.wos
ethz.identifier.scopus
ethz.publication.place
London
ethz.publication.status
published
en_US
ethz.leitzahl
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02010 - Dep. Physik / Dep. of Physics::02510 - Institut für Quantenelektronik / Institute for Quantum Electronics::03759 - Faist, Jérôme / Faist, Jérôme
en_US
ethz.leitzahl.certified
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02010 - Dep. Physik / Dep. of Physics::02510 - Institut für Quantenelektronik / Institute for Quantum Electronics::03759 - Faist, Jérôme / Faist, Jérôme
ethz.grant.agreementno
165639
ethz.grant.fundername
SNF
ethz.grant.funderDoi
10.13039/501100001711
ethz.grant.program
Projekte MINT
ethz.date.deposited
2019-04-22T02:59:28Z
ethz.source
SCOPUS
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2019-04-23T14:45:57Z
ethz.rosetta.lastUpdated
2024-02-02T07:42:01Z
ethz.rosetta.exportRequired
true
ethz.rosetta.versionExported
true
ethz.COinS
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