Light with Even Fock states from Interference of Kerr-squeezed Light

TL;DR

This paper demonstrates how destructive interference of Kerr-squeezed states can produce non-classical light containing only even Fock states, with potential applications in quantum optics.

Contribution

It introduces a method to generate even-only Fock state light through interference of Kerr-squeezed states, independent of nonlinearity strength.

Findings

Perfect cancellation of odd Fock state amplitudes achieved

Even Fock state light persists across different nonlinearity regimes

Robust against phase deviations in the input states

Abstract

We demonstrate the generation of non-classical light by destructive interference of identical Kerr squeezed states. Perfect pair-wise cancellation of amplitudes that contribute to odd Fock states results in light with only even Fock states, independent of the strength of the nonlinearity. The observability of this effect is only limited by the quality of the interferometer. In the low nonlinearity limit, the even-only state resembles a squeezed vacuum state, yet the even-odd oscillations persist when the nonlinearity is strong. The effect is also robust against deviations from the optimum relative phase of the input Kerr-squeezed states.