Elina Sendonaris, California Institute of Technology, Applied Physics department, Pasadena, USA

Leuchs-Russell-Auditorium, A.1.500, Staudtstr. 2, Erlangen
Location Details

Abstract
Pulsed quantum states can enable dense quantum information communication and time-multiplexed computation. Specifically, multimode optical squeezed states (states where the variance of one optical quadrature is below the standard quantum limit) are of interest since they can enable more sensitive measurements and be used to generate entangled states, sometimes within a single pulse. The modes in which the squeezed states reside are overlapping orthogonal modes within one pulse, making it a very dense state. They can be generated in integrated nonlinear photonic chips due to the low dispersion possible through the engineering of the waveguides. However, typically these modes are challenging to characterize. In this talk, I will discuss how to apply a popular technique in characterizing classical ultrafast pulses, frequency resolved optical gating, or FROG, to characterizing these orthogonal quantum temporal modes. I will discuss the theoretical results behind how this technique can effectively diagonalize the state and its covariance matrix and show how a temporally multimode squeezed state can be reconstructed, both numerically and experimentally. This technique is a promising path forward for temporally multiplexed optical quantum information processing and communication.