Elisabeth Wagner

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

Weird. not once do they say "it's good that women won't be going to jobby-jobs to do busy-work for bosses who don't know how to use an electronic calendar, & it'll be great that more women will be able to work on, and do exactly what they want" abc.net.au/news/2022-08-3…

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

The PhD scholarship round 2022 @SydneyQuantum is now open! Come join us: macq.it/3nPjOsn #quantum @MQSciEng

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

@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

@quant_EW was great meeting you in person last week! Hope your remaining travels are going well.

@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! ;)

@quant_EW @MikolajKSchmidt @magneticlemur @unipb @MQPhysAstro @dfg_public @PhotonicsMeetup Thanks! Cool experiment and idea.

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

@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.

@quant_EW @MikolajKSchmidt @magneticlemur @unipb @MQPhysAstro @dfg_public @PhotonicsMeetup I’m confused about the need for the grating. Is the point that you want the grating in order to satisfy the conservation laws for OAM while leaving the analogous laws for spin to create polarization entanglement?

@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.

@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.

@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.

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

@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!

@quant_EW @PhotonicsMeetup @MikolajKSchmidt @magneticlemur @unipb @MQPhysAstro @dfg_public crazy photons! wait, can u entangle photons that have diff vortex state?