Ultrafast birefringence oscillations in superfluid helium provide evidence for anisotropic quantum squeezing of quasiparticle pairs, arising as a superposition from rotons, maxons, and Pitaevskii's plateau with nonzero initial phase from multimode interference.
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Squeezed Vibrational States in Superfluid Helium
Ultrafast birefringence oscillations in superfluid helium provide evidence for anisotropic quantum squeezing of quasiparticle pairs, arising as a superposition from rotons, maxons, and Pitaevskii's plateau with nonzero initial phase from multimode interference.