Online Program Home
My Program

Abstract Details

Activity Number: 188 - Contributed Poster Presentations: Section on Physical and Engineering Sciences
Type: Contributed
Date/Time: Monday, July 29, 2019 : 10:30 AM to 12:20 PM
Sponsor: Section on Physical and Engineering Sciences
Abstract #305243
Title: Quantum Channel Probing with Indefinite Causal Ordering
Author(s): Michael Frey* and Eric Johnson
Companies: National Institute of Standards and Technology and University of Colorado
Keywords: Fisher information; parameter estimation; quantum statistics; quantum channel identification
Abstract:

Small-scale quantum data networks are envisioned to be deployed in the near future, increasing the need for efficient estimation and validation protocols for network components. The statistical determination of one or more parameters of a quantum channel is called quantum channel identification (QCI). QCI is accomplished by passing probes in prepared quantum states through the channel and then estimating the parameter(s) from the measured channel outputs. Quantum Fisher information (QFI) is a means to assess and compare different probing schemes. We use QFI to study a probing scheme in which the channel is put in indefinite causal order (ICO) with copies of itself, focusing our investigation on the state preservation probability in a standard noisy channel model, the quantum depolarizing channel. In this setting we are able to obtain the QFI in closed analytic form, and we find that ICO-assisted probing yields greater information than does the comparable scheme with definite ordering and that the information gained is consistently greater when the channel ordering is more indefinite. Our approach extends to the study of different types of channel orderings.


Authors who are presenting talks have a * after their name.

Back to the full JSM 2019 program