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quant-ph2026
Energy levels of the second-harmonic Hamiltonian at large photon numbers
Boulat Nougmanov
We study the energy spectrum of the degenerate Hamiltonian describing second-harmonic generation and parametric down-conversion at large total excitation numbers. Owing t…
quant-ph2026
Heisenberg limit in phase measurements: the threshold detection approach
D. I. Salykina, V. S. Liamin, V. L. Gorshenin +2
The ultimate precision of phase estimation is limited by the Heisenberg scaling , where is a numerical prefactor and is the mean number of photons intera…
quant-ph2025
Optimal squeezing to minimize vulnerability to losses
Boulat Nougmanov
Non-Gaussian states, described by Wigner quasi-probability distribution taking negative values, are of great interest for various applications of quantum physics. It is known howev…