Quantum Noise in Lasers and Parametric Oscillators: Inside Versus Outside

P. D. Drummond, Alistair S. Lane, Daniel F. Walls

Daoqi Yu

Fluctuations of the square of the field amplitude inside and outside a degenerate parametric oscillator are investigated. It is shown that a large reduction of the noise of the square of the field amplitude can be achieved outside the cavity while the maximum amplitude-squared squeezing inside the cavity is only by 50%. This situation is similar to that for normal squeezing.

M. Lax, W. H. Louisell

Eyob Alebachew

We consider a nondegenerate three-level cascade laser with a subthreshold nondegenerate parametric oscillator coupled to a vacuum reservoir. Applying the pertinent master equation, we analyze the squeezing and entanglement properties of the two-mode light produced by this quantum optical system inside and outside the cavity. We also determine the normalized second-order correlation function for the two-mode light as well as for individual mode. We find that the light generated by this system is in a two-mode squeezed state and the state of the system is strongly entangled at steady state. Moreover, the presence of the parametric oscillator leads to an increase in the degree of squeezing and entanglement. We also find that the intermode correlation decreases as the injected atomic coherence decreases in the system.

J. P. Woerdman, Martin P. van Exter, N. J. van Druten

E. Wu, Lixia Zeng, Haiyang Song +1 more

We discuss the generation and evolution of a macroscopic entanglement light with a subthreshold non-degenerate parametric oscillator, coupled to a vacuum reservoir. The four-level atoms driven by two classical fields interact with the parametric oscillator. The master equation for the cavity modes of the scheme is derived and analyzed, the entanglement properties of the two-mode light generated by this scheme inside and outside the cavity is studied. We show that the light produced by this system is strongly entangled with time evolution inside and outside a cavity.