09:40:52 I just,
09:40:57 I was actually referring to Ted is Ted Jacobs on So, yeah, I'm not sure, maybe my question has been covered but I'm eager you mentioned an analogous setup with the magnetic field playing the role of the gravitational redshift effect.
09:41:11 And I just wondered, in your mind, like what distinguishes those it seems like it's really the same quantum mechanical phenomenon.
09:41:21 So why should I care that. In one case,
09:41:30 it's a gravitational potential that's causing the effect the other case it's a magnetic field is it teaching me something about quantum gravity.
09:41:38 Given that analogy, it seems like it's not.
09:41:42 Thank you very much me is a fantastic question I'm very happy to clarify this, so it's in the same spirit as just normal time dilation. Any, any so forget even the quantum part, any test of time dilation relies on the fact that you clock tick, tick differently
09:41:58 at different rates. Now you can simulate clocks different Ticket Ticket differently with other beans than gr. You know you can take a Swiss clock and Italian clock or so and you know they will take it differently.
09:42:10 Just to give you an example. And so similarly here, you can induce the magnetic field which also changes your speed precision. The special thing about gr is that of course it's universal This has nothing to do with a mechanism of the clocks, which in
09:42:32 case happen to be spins. And then if you replace them that by you know atomic clocks for example they might appear. This energy is magnetic field will not make them tick differently. And so this universal aspects of course different, but the other aspect of your question is, does the teacher
09:42:38 of your question is nessa teach us something about a GDPR and competition. It does not teach us about quantum gravity, but it does teach us if we do within the gravitational field is that also the post Newtonian corrections which corresponds to proper
09:42:51 time. We can also add into the kind of normal description, which would not be surprising from the framework we have today, but it will be the first demonstration of actually doing that so dynamics of systems with post-natal any corrections.
09:43:07 And so I think it's a very important aspect to test.
09:43:12 I'll just stand by the question. Yeah, thank you.
09:43:16 And Ariana.
09:43:18 Thank you for very interesting talk with it what do you talk about clocks and superposition It looks like you need to be a clock states is under literally as a clock technology was sort of primary experimental proposals being and mortars item with the
09:43:47 So I'm curious about was there is any kind of experiment you can make whereas the clocks would actually have the clocks, and maybe not the current clocks but say clocks 20 years in the future would be sensitive so what would be your ideal clock experiment
09:43:50 the test those ideas and whether having a clocks in space from, you know, various cc elliptical orbits would actually help and you know, thinking about regardless of what the state of the current technology is so what does it like you would like two clocks
09:44:04 to be able to do the half larger separation to be able to actually entangle clocks. It different heights, whether that would actually be useful or not.
09:44:16 So, here, he'll just looking at the various possible proposals where the clocks would be actually more sensitive than the parameters, where it's really you're thinking about actually a bit different.
09:44:25 There's always more since this was awesome.
09:44:30 Thanks also I mean it's an excellent question at the root of it you're right that for the proposal the actual clocks technology does not matter it's just if you have dynamic degrees of freedom, it could be anything.
09:44:40 And in fact, even you know with the G coherence You don't even have, you know, you have some thermal vibrations that they'll don't even mean anything to you but they did up here.
09:44:47 And so that's why we focused initially on this atomic because the separation is important, but your question is very very very interesting and I don't have a very good answer.
09:44:54 So, for sure I think clock technology as it develops will also be relevant. So for example, June talked about the localization and block oscillations across, you know, a lattice, that will become probably interesting and I met you know that this one of
09:45:07 the things we want to look at for sure. But in terms of dreaming. And of course if you have like a very large letters you know over. I didn't know what, you know, centimeter scale or so, or even more than that, really might kick in.
09:45:21 And if you go to space on first, it might not help you because you know gravity's, you know, there's no gravity basically it's worse. But if you can entangle clock so we actually have a period of preparation which shows that you can do a similar effect
09:45:33 with entangled system. If you do specific quantum operations. And so that might be in fact, in fact the best approach.
09:45:40 Because then you can really scale up separations to whatever you want. And you're just limited by how good can you do quantum control, and that is much, much easier.
09:45:48 So, so excellent questions I don't have good answers but I think what you're saying is outlining precisely what what we will look at it, you know, in the near future.
09:45:58 Thanks so much.
09:46:02 Okay.
09:46:06 Arkady.
09:46:08 Okay, thank you.
09:46:11 I still plan to follow you know when you're talking about this kind of post Newtonian collection, you know, I mean, this time dilation right then. My understanding is that essentially this kind of check of acuity and speeds.
09:46:27 Because, you see, it becomes this kind of say, depends on songs on the position or whatever, but you can interpret it as a kind of change of the message this is simply because, and then it leads to the interpretation of the time duration right and and
09:46:45 they agreed what you mentioned about this when you decided you said, What is specific is that you believe that it's universal is his way of influencing your clock.
09:46:59 I mean, but, but it's, but, but I was wondering about was it you know kind of what kind of been this kind of universality.
09:47:08 It's no essentially it's classical human life. It's not that. You know it doesn't even call for granted. But, but it's still account for was Newtonian because this one was he square, whatever.
09:47:21 I mean, yeah, so, so, So in this sense, I'm not sure if I got that right. That was a you kind of say, radiation was so different say because I would say, I would think that this kind of universality you know this equivalence principle, it is get the well
09:47:40 defined in, in, in, in the case you're considering Boise Sampson doubtful there.
09:47:49 Yeah, it was a very insightful comment and you're I think you're exactly right and so these corrections that we look at last order in our genius limit why can just as well obtained just by the Shelton equivalents.
09:48:01 So that's exactly right, and there's no no modification of it, it's a direct consequence of the equivalence principle. And this is a prediction, and it is University of courses, classical that is it the prediction in the quantum domain that there's this
09:48:13 additional entanglement effect that it will predict if you quantify state of the degrees of freedom and forth. So you're exactly right. And, you know, one could say okay so this would test kind of these principles that limit and then see how this course
09:48:26 And if I guess what, you know, let's say worried they want to say okay but what really wants to go to a regime, where the equivalence principles no longer sufficient to predict it out, I did the same effects to their peers because the only proper time
09:48:40 matters, and you need to separate it further. And so then you know slightly different type of setup would have the same type of principle but you know maybe then these corrections that enter, are no longer sufficient just to do it in a homogeneous.
09:48:53 Okay. Yeah, but I must be made because it was this discussion about, you know, this up completion of the CV, all the stuff it's it's kind of not very much relevant those points right I understood what you said about quantum mechanical experience of this
09:49:09 connections, I, I agree with this.
09:49:11 But in this sense, it's not like, know how to say absolutely insufficient said it convince them as this label as you can see the it is sufficient right at this point.
09:49:23 I said, Okay, thank you. Yes, yes.
09:49:28 Thanks You're very interesting talk. So just sort of taught, based on this discussion that you were having with. I remember about this magnetic field simulating the effect and sort of the effect of gravity on quantum degrees of freedom.
09:49:45 Is there any known effect of gravity or gravitational curvature on the polarization of a photon.
09:49:53 If I said instead of doing sort of all this atom interferometry if I did sort of a polarization interferometry with photons would one. Expect or should see something.
09:50:06 Thanks for the question. It's a very good question. It was our first thought that being after his 2011 paper to try and do it.
09:50:12 If so, if one wants to look at the same effect we look here. The issue with photons is that photons are on a now curve so the proper time the experience is always the same, so it's zero.
09:50:22 So you can never have like a proper time difference between photons and that polarization changing.
09:50:28 However, so on the polarization.
09:50:31 I'm not sure.
09:50:32 First of all, there are other effects on the polarization and there's other proposals, which I think are very interesting you know other gr curvature effects the change polarization.
09:50:41 There are some proposals for space based experiments, they're not from our group but very interesting. So that's one part of that, and the other is if I wanted to see this time dilation effect.
09:50:52 There is a analogous or not analogous But there is another manifestation of it, namely it's not that you experienced different time proper time, but the photons actually have a different path that effectively move and that's called a different Peter Julie.
09:51:07 And so the Shapira delay is the same manifestation on this limit, namely that, you know, as it passes close to the mass it effectively is slow down, but that just means it has, you know, much bigger longer geodesic to go through and that you can use for
09:51:22 interferometry with single photons, and their proposals we had the first proposal Listen, there are some experimental proposals trying to do that, the space space missions I mentioned are in this form, where you have a single photo interference along
09:51:36 very large baseline, leveraging their Schumpeter delay, and we have a paper and from 2012.
09:51:43 But it's not polarization it's just their path here.
09:51:46 So just to clarify, so, so did these effects that you mentioned which I didn't know about of the effect of gravitational potentials on the polarization.
09:51:56 They would also count as evidence or whatever you want to call it off the sort of the interface of gravity and quantum mechanics, would you say that. Absolutely, and in particular I made this distinction of different types of interface that would be also
09:52:10 a test of quantum mechanics and curve space that in fact that will be really crowded space then because you do need, you know, really the geodesic recession or lead steering.
09:52:21 If you want to see this effect. And there are some papers in this.
09:52:25 Maybe when you have a moment, maybe you can send me one of the references, of course.
09:52:31 Thanks. So before we leave for a break I there's a brief comment from it.
09:52:37 To sing guy in the chat window says these terms you're focused on seem to describe the fact that the massive an atom depends on the electronic state.
09:52:46 Yeah, thanks for this comment at times very well with some things that have been said it's exactly right that's exactly that this is the manifestation of the agreements principle, namely, in combination with a special altruistic equals mc squared.
09:53:00 So because the mass of a system depends on the energy. In other words, depending on what energy level your system has seen it actually has a different math, and these terms I have appeared because there's different bass is a different gravitational mass.
09:53:13 And so what our party for example said is that you cannot see these terms just from records principles precisely that you postulate equals mc squared and then m equals m g.
09:53:23 And then you can get these trips so that's right in the system has different paths depending on what the energy state.
09:53:29 Okay, um, let's.
09:53:32 We will have a break until roughly 10am.
09:53:36 So see everyone will see everyone then thanks but.