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| title | chunk | source | category | tags | date_saved | instance |
|---|---|---|---|---|---|---|
| Coherence (physics) | 4/4 | https://en.wikipedia.org/wiki/Coherence_(physics) | reference | science, encyclopedia | 2026-05-05T13:41:37.176399+00:00 | kb-cron |
=== Quantum coherence as a resource === M. B. Plenio and co-workers constructed an operational formulation of quantum coherence as a resource theory. They introduced coherence monotones analogous to the entanglement monotones. Quantum coherence has been shown to be equivalent to quantum entanglement in the sense that coherence can be faithfully described as entanglement, and conversely that each entanglement measure corresponds to a coherence measure.
== Applications ==
=== Holography === Coherent superpositions of optical wave fields include holography. Holographic photographs have been used as art and as difficult to forge security labels.
=== Non-optical wave fields === Further applications concern the coherent superposition of non-optical wave fields. In quantum mechanics for example one considers a probability field, which is related to the wave function
ψ
(
r
)
{\displaystyle \psi (\mathbf {r} )}
(interpretation: density of the probability amplitude). Here the applications concern, among others, the future technologies of quantum computing and the already available technology of quantum cryptography. Additionally the problems of the following subchapter are treated.
=== Modal analysis === Coherence is used to check the quality of the transfer functions (FRFs) being measured. Low coherence can be caused by poor signal to noise ratio, and/or inadequate frequency resolution.
== See also ==
== References ==
== External links == Dr. SkySkull (2008-09-03). "Optics basics: Coherence". Skulls in the Stars.