We investigate two different kinds of quantum trajectories for a nonlinear photon resonator subject to two-photon pumping, a configuration recently studied for the generation of photonic Schroedinger cat states. In the absence of feedback control and in the strong-driving limit, the steady-state density matrix is a statistical mixture of two states with equal weight. While along a single photon-counting trajectory the systems intermittently switches between an odd and an even cat state, we show that upon homodyne detection the situation is different. Indeed, homodyne quantum trajectories reveal switches between coherent states of opposite phase.
@article{arxiv.1612.01849,
title = {Homodyne versus photon-counting quantum trajectories for dissipative Kerr resonators with two-photon driving},
author = {Nicola Bartolo and Fabrizio Minganti and Jared Lolli and Cristiano Ciuti},
journal= {arXiv preprint arXiv:1612.01849},
year = {2017}
}
Comments
To appear on Eur. Phys. J. Special Topics, Quantum Gases and Quantum Coherence; 8 pages, 2 composed figures (5 panels)