Higher Order Squeezing of Thermal Radiation through Parametric Amplification

Zhi‐Ming Zhang, Lei Xu, Jin-lin Chai +1 more

Yuki Sano, Yoshitaka Taguchi, Kenichi Oguchi +1 more

We investigate a limiting factor of waveguide optical parametric amplifiers used for generating broadband squeezed light. We found that spatially non-degenerate optical parametric amplification (OPA) between the fundamental modes and the higher-order modes generates noise, and that this effect can be avoided by detecting the squeezed light with the optimal spatial mode. The analysis is conducted assuming the waveguides with different dimensions, offering valuable insight into the waveguide design for squeezing.

Samuel Boutin, David M. Toyli, Aditya V. Venkatramani +3 more

In quantum information processing, the Josephson parametric amplifier (JPA) has become a crucial tool for fast, high-fidelity readout of superconducting qubits, and for the generation of squeezed microwave radiation. However, research groups worldwide have reported unexpected nonidealities in these devices, leading to poorer than anticipated performance. Using numerical simulations complemented by experiments, the authors pinpoint oft-neglected higher-order circuit nonlinearities as the main source of these nonidealities, and provide simple, concrete steps to improve JPA performance.

M. M. Sushchik, V. M. Fortus, Gennadii I Freidman

А. В. Белинский, A. S. Chirkin

Tamirat Abebe, Nebiyu Gemechu, Chimdessa Gashu Feyisa +3 more

In this paper, employing the stochastic differential equations associated with the normal ordering, the quantum properties of a nondegenerate three-level cascade laser with a parametric amplifier and coupled to a two-mode thermal reservoir are thoroughly analyzed. Particularly, the enhancement of squeezing and the amplification of photon entanglement of the two-mode cavity light are investigated. It is found that the two cavity modes are strongly entangled and the degree of entanglement is directly related to the two-mode squeezing. Despite the fact that the entanglement and squeezing decrease with the increment of the mean photon number of the thermal reservoir, strong amount of these nonclassical properties can be generated for a considerable amount of thermal noise with the help of the nonlinear crystal introduced into the laser cavity. Moreover, the squeezing and entanglement of the cavity radiation enhance with the rate of atomic injection.