Southwest Quantum Information and Technology

Quantum noise in a PT symmetric system

Presenting Author: Jayson Rook, Miami University
Contributing Author(s): Perry Rice

A PT symmetric system is invariant under the combined action of parity and time-reversal. For a system of two coupled quantum oscillators, PT symmetry can occur by having one oscillator with gain and another with loss. Classically, when gain and loss coefficients are equal, the system exhibits a zero linewidth. Using quantum trajectory theory we find that the linewidth is not zero but scales as 1/, where is the average excitation number. This line-width is minimized near the exceptional point, where eigenvalues and eigenvectors coalesce. We make connections to an incoherently pumped, three-level laser, and electromagnetically induced transparency. We also consider this system as a heat engine, and investigate coherent pumping and nonclassical inputs.

(Session 5 : Thursday from 5:00pm - 7:00 pm)