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Visualization of correlations in hybrid discrete—continuous variable quantum systems

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journal contribution
posted on 11.03.2020, 12:09 by Russell Rundle, Ben Davies, Vincent Dwyer, Todd Tilma, Mark EverittMark Everitt
In this work we construct Wigner functions for hybrid continuous and discrete variable quantum systems. We demonstrate new capabilities in the visualization of the interactions and correlations between discrete and continuous variable quantum systems, where visualizing the full phase space has proven difficult in the past due to the high number of degrees of freedom. Specifically, we show how to clearly distinguish signatures that arise due to quantum and classical correlations in an entangled Bellcat state. We further show how correlations are manifested in different types of interaction, leading to a deeper understanding of how quantum information is shared between two subsystems. Understanding the nature of the correlations between systems is central to harnessing quantum effects for information processing; the methods presented here reveal the nature of these correlations, allowing a clear visualization of the quantum information present in these hybrid discrete-continuous variable quantum systems. The methods presented here could be viewed as a form of quantum state spectroscopy.

Funding

EPSRC [grant number EP/N509516/1]

JSPS KAKENHI (C) Grant Number JP17K05569

History

School

  • Science
  • Mechanical, Electrical and Manufacturing Engineering

Department

  • Physics

Published in

Journal of Physics Communications

Volume

4

Issue

2

Publisher

IOP Publishing

Version

VoR (Version of Record)

Rights holder

© The Authors

Publisher statement

Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence (https://creativecommons.org/licenses/by/4.0/). Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.

Acceptance date

24/01/2020

Publication date

2020-02-04

Copyright date

2020

eISSN

2399-6528

Language

en

Depositor

Dr Vincent Dwyer. Deposit date: 10 March 2020

Article number

025002

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