Manifestations of quantum fluctuations in optical solitons: comment on a previous letter

А. В. Белинский

D. Yu. Kuznetsov

Gian‐Luca Oppo, John Jeffers

R. Bullough, N. M. Bogoliubov, JUSSI TIMONEN

Summary form only given. Quantum solitons appear in the optical communications literature as classical solitons vested with quantum fluctuations. A generic model is the quantum nonlinear Schrodinger model which may describe soliton transmission in an optical fibre. We show how the natural 'quantum soliton' of the system derives from the matrix element of the quantised field operator under a condition of very large particle number. We also comment on its quantum noise and stability.

Demin Yao

Quantum fluctuations of optical solitons in fibers are discussed on the basis of the exact quantum states in the frame of the quantum nonlinear Schr\"odinger equation. Position and momentum fluctuations as well as quadrature phase fluctuations are calculated, and explicit results are expressed in terms of the intrinsic quantum parameters. Soliton wave-packet spreading and phase-diffusion phenomena are clearly demonstrated, and the corresponding squeezing effects are analyzed. In particular, soliton amplitude squeezing is investigated in an experimental setup of a Mach-Zehnder interferometer containing an optical fiber. Coherent states for quantum solitons are discussed with attention given to their dynamical preservability. Compared with previous linearized approaches, the present study may provide a more fundamental treatment to quantum fluctuations of solitons.

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