Elisabeth Wagner

PhD candidate in quantum info @ARC_EQUS @SydneyQuantum. BSc & MSc in quantum optics @unipb. She/her

[Elisabeth Wagner @quant_EW]

@tgmn__ The formulation of the headline alone is appalling...

[Elisabeth Wagner @quant_EW]

This road trip through Australia for #quantum and #darkmatter outreach was an absolutely outstanding experience – thanks @ARC_EQUS !

[National Quantum & Dark Matter Road Trip @qdmroadtrip]

Thank you to all of the universities who supported our epic #QDMroadtrip.

It was an honour to talk #quantum and #darkmatter science with communities and schools across Australia.

@UniMelb @Swinburne @ourANU @Macquarie_Uni @UQscience @Sydney_Uni @ScienceUWA @UniofAdelaide

[Elisabeth Wagner @quant_EW]

The PhD scholarship round 2022 @SydneyQuantum is now open! Come join us: https://t.co/9ND1xPZeKD #quantum @MQSciEng

[Science and Engineering @ MQU @MQSciEng]

"It is really inspiring to see the entirely odd behavior of quantum particles on a very fundamental level," PhD student Elisabeth Wagner, winner of the SQA Scholarship on studying #quantum.

Apply now for the 2021 @SydneyQuantum PHD #scholarship: https://t.co/qPwVrTEmXY
#STEM

[National Quantum & Dark Matter Road Trip @qdmroadtrip]

What a ride it has been!

✅ 7,000km
✅ 40 towns and cities
✅ 25 schools

We had a ball spreading the word about #quantum and #darkmatter science across Australia.

Thank you @Aus_ScienceWeek and all the schools and communities that welcomed us.

@ARC_EQUS @ARC_DMPP @arc_gov_au

[Elisabeth Wagner @quant_EW]

@rdviii @rdviii Thanks! Was an honour meeting you in-person. Hope you have had a nice evening in Munich and flight back. All the best

[Elisabeth Wagner @quant_EW]

@LundeenOttawa @MikolajKSchmidt @magneticlemur @unipb @MQPhysAstro @dfg_public @PhotonicsMeetup Thank you! It's just theory so far, but an experimental realization might not be too far away! ;)

[Elisabeth Wagner @quant_EW]

Entangling photons – with a twist! Have a look at the nonlinear generation of a special kind of optical waveguide modes
@MikolajKSchmidt @magneticlemur @unipb @MQPhysAstro @dfg_public @PhotonicsMeetup #POM20ju #POM20LM #quantumoptics

[Elisabeth Wagner @quant_EW]

@LundeenOttawa @MikolajKSchmidt @magneticlemur @unipb @MQPhysAstro @dfg_public @PhotonicsMeetup In the end the four-wave-mixing process generates polarization-entangled signal and idler photons that are then just coupled to photons with non-zero OAM without change of polarization.

[Elisabeth Wagner @quant_EW]

@LundeenOttawa @MikolajKSchmidt @magneticlemur @unipb @MQPhysAstro @dfg_public @PhotonicsMeetup However, the coupling strength of these spin-orbit coupling processes with changing spin/polarization is very weak and are not considered.

[Elisabeth Wagner @quant_EW]

@LundeenOttawa @MikolajKSchmidt @magneticlemur @unipb @MQPhysAstro @dfg_public @PhotonicsMeetup This means that in principle, say, a left-circularly polarized photon with zero OAM could indeed couple to a right-circularly polarized photon with non-zero OAM without such a helical grating as the total angular momentum of the process would be conserved.

[Elisabeth Wagner @quant_EW]

@LundeenOttawa @MikolajKSchmidt @magneticlemur @unipb @MQPhysAstro @dfg_public @PhotonicsMeetup In general, only the total angular momentum (= orbital angular momentum (OAM) + spin angular momentum) of the process needs to be conserved, where in this case the spin is referred to as the polarization as we are dealing with photons.

[Elisabeth Wagner @quant_EW]

@LundeenOttawa @MikolajKSchmidt @magneticlemur @unipb @MQPhysAstro @dfg_public @PhotonicsMeetup Thanks, this is a very good point!
(Please see further comments below.)

[Elisabeth Wagner @quant_EW]

@igordownunder @PhotonicsMeetup @MikolajKSchmidt @magneticlemur @unipb @MQPhysAstro @dfg_public Yes! The trick is that the photons exhibit (depending on the grating) different vortex states, but are entangled in their polarization degree of freedom – not in their orbital angular momentum states.

Hope this answers your question!