I What Is the Smallest Change Detected by a Multiport Interferometer?

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The smallest change detected by a multiport interferometer is often in the range of picometers for phase shifts and nanometers for wavelength changes. Advanced multiport interferometers, such as those utilizing optical fibers or integrated photonics, have achieved these sensitivities. Specific examples include setups that leverage high-quality optical components and sophisticated signal processing techniques. The exact smallest change can vary based on the design and application of the interferometer. Multiport interferometers continue to push the boundaries of measurement sensitivity in various scientific fields.
Precious Adegbite
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Minimum change in phase of multiport interferometer
Good morning all... please I'd like to know what's the smallest ever recorded change in phase or wavelength any multiport interferometer has ever been able to detect.
And which multiport interferometer detected it.
 

Thread 'Antilinear Operators'

An antilinear operator ##\hat{A}## can be considered as, ##\hat{A}=\hat{L}\hat{K}##, where ##\hat{L}## is a linear operator and ##\hat{K} c=c^*## (##c## is a complex number). In the Eq. (26) of the text https://bohr.physics.berkeley.edu/classes/221/notes/timerev.pdf the equality ##(\langle \phi |\hat{A})|\psi \rangle=[ \langle \phi|(\hat{A}|\psi \rangle)]^*## is given but I think this equation is not correct within a minus sign. For example, in the Hilbert space of spin up and down, having...
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