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Author | Topic: universe- why is it here? | |||||||||||||||||||
Tony650 Member (Idle past 4032 days) Posts: 450 From: Australia Joined: |
Hi sidelined.
I think I get what you're saying. One question, though; will this problem always be inherent in our equipment/techniques or is it something that could be eliminated as our equipment/techniques become more refined? Based on my "understanding," I'm guessing that simply refining our current tools will be insufficient. It sounds more like one of those boundaries that, by its nature, simply can't be crossed. Thanks for the link, too! I took a glance and it looks very promising! I'll be checking it out in more detail shortly.
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Tony650 Member (Idle past 4032 days) Posts: 450 From: Australia Joined: |
happy_atheist writes: Yes, if two quantum particles are in the same state they are indistinquishable and to all intents and purposes the same. So in a sense the same particle can occupy two points in space simultaneously? Also, this is how you can affect particle A by doing something to particle B, correct? I understand that anything done to one will happen to the other.
happy_atheist writes: Thats what makes teleportation different to a photocopy. Hmm...I'm afraid I'm still not clear on the difference, though. Perhaps I should rephrase the question. What would constitute particle B being a copy of particle A, as opposed to indistinguishable from particle A? If one particle is a mere copy of the other, how can you tell the difference between them?
happy_atheist writes: They condense to the same quantum mechanical energy state, not the same position in space So is my understanding correct that all the particles in a condensate can be viewed as one particle occupying multiple points in space simultaneously?
happy_atheist writes: I have the equations for it in my notes at home I think, i'll review them tonight and see if I get glean some more understanding from them. Wow, thanks happy! Don't go to too much trouble, though. I don't want you to go out of your way for me. I appreciate your help either way.
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sidelined Member (Idle past 5908 days) Posts: 3435 From: Edmonton Alberta Canada Joined: |
Darwin Storm
I am sorry I did not reply to this. I cannot track down the precise paper however there are several that you may scope out. These are from the University of Tel Aviv at this website http://www.tau.ac.il/...tum/publicat/publicat.html#weak-meas
Emergence of Weak Values
Lev Vaidman in Quantum Interferometry, F. De Martini, G.Denardo, Y. Shih (eds.) (VCH Publishers, Weinheim, 1997), 485 quant-ph/9607023 Adiabatic Measurements on Metastable SystemsY. Aharonov, S. Massar, S. Popescu, J. Tollaksen and L. Vaidman Phys. Rev. Lett. 77, 983 (1996) quant-ph/9602011 Weak-Measurement Elements of RealityLev Vaidman Found. Phys. 26, 895 (1996) quant-ph/9601005 There Is No Classical Analog of a Quantum Time-Translation MachineLev Vaidman Phys. Rev. A 52, 4297 (1995) quant-ph/9502004 Weak MeasurementsLev Vaidman in Advances in Quantum Phenomena, E. Beltrametti and J.M. Levy-Leblond eds., NATO ASI Series B: Physics Vol. 347 (Plenum Press, NY, 1995), 357 hep-th/9408154 Negative Kinetic Energy Between Past and Future State VectorsDaniel Rohrlich, Yakir Aharonov, Sandu Popescu and Lev Vaidman Ann. NY Acad. Sci. 755, 394 (1995) cond-mat/9406116 Measurements, Errors, and Negative Kinetic EnergyY. Aharonov, S. Popescu, D. Rohrlich and L. Vaidman Phys. Rev. A 48, 4084 (1993) hep-th/9305075 Measurement of Negative Kinetic Energy of Tunneling ParticlesY. Aharonov, S. Popescu, D. Rohrlich and L. Vaidman Jap. Jour. App. Phys. Series 9, 41 (1993) A Quantum Time MachineL. Vaidman Found. Phys. 21, 947 (1991) Complete Description of a Quantum System at a Given TimeY. Aharonov and L. Vaidman Jour. Phys. A 24, 2315 (1991) Superpositions of Time Evolutions of a Quantum System and a Quantum Time-Translation MachineY. Aharonov, J. Anandan, S. Popescu and L. Vaidman Phys. Rev. Lett. 64, 2965 (1990) Weak Measurement of Photon PolarizationJ.M. Knight and L. Vaidman Phys. Lett. A 143, 357 (1990) Properties of a Quantum System During the Time Interval Between Two MeasurementsY. Aharonov and L. Vaidman Phys. Rev. A 41, 11 (1990) Reply to Leggett and Peres on "How the result..."Y. Aharonov and L. Vaidman Phys. Rev. Lett. 62, 2327 (1989) A New Characteristic of a Quantum System Between Two Measurements - a Weak ValueY. Aharonov and L. Vaidman in Bell's Theorem, Quantum Theory and Conceptions of the Universe, M. Kafatos (ed.), 17 (1989) How the Result of Measurement of a Component of the Spin of a Spin-1/2 Particle Can Turn Out to Be 100Y. Aharonov, D. Albert and L. Vaidman Phys. Rev. Lett. 60, 1351 (1988) Surprising Quantum EffectsY. Aharonov, D. Albert, A. Casher and L. Vaidman Phys. Lett. A 124, 199 (1987) How to Ascertain the Values of Sigma_x, Sigma_y, and Sigma_z of a Spin-1/2 ParticleL. Vaidman, Y. Aharonov and D. Albert Phys. Rev. Lett. 58, 1385 (1987)
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Tony650 Member (Idle past 4032 days) Posts: 450 From: Australia Joined: |
Hi happy. This is just a bump in case you missed my reply to your post. It isn't registering on your message index page and I didn't want you to think I'd ignored you.
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Tony650 Member (Idle past 4032 days) Posts: 450 From: Australia Joined: |
Hold on...it's still not registering. I think I replied to the wrong post. Let's see if this one works.
EDIT: Yep, that did it. Sorry about that, happy. Anyway, if you don't know what I'm on about, see post number 139 above. This message has been edited by Tony650, 09-06-2004 09:08 AM
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sidelined Member (Idle past 5908 days) Posts: 3435 From: Edmonton Alberta Canada Joined: |
Tony650
I think I get what you're saying. One question, though; will this problem always be inherent in our equipment/techniques or is it something that could be eliminated as our equipment/techniques become more refined? The problem lies in the fact that our instruments sre made of the same stuff as that which we are trying to study. Any limitations on the subject are also a limitation on the investigating instrument.
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happy_atheist Member (Idle past 4913 days) Posts: 326 Joined: |
Sorry for taking so long to reply. I may have to wait until friday to post from my notes back home. I'm have to hand my dissertation in on friday (i have over 18000 words done, i must have been working harder than I realised lol). I haven't had the chance to read through my notes yet
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Tony650 Member (Idle past 4032 days) Posts: 450 From: Australia Joined: |
sidelined writes: The problem lies in the fact that our instruments sre made of the same stuff as that which we are trying to study. Any limitations on the subject are also a limitation on the investigating instrument. Of course. So the only way around this would be to find a way to study them which doesn't require anything made of them? Hmm...well I, for one, can think of no way to do this. Anyway, I understand that. Thank you, sidelined.
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Tony650 Member (Idle past 4032 days) Posts: 450 From: Australia Joined: |
happy_atheist writes: Sorry for taking so long to reply. I may have to wait until friday to post from my notes back home. I'm have to hand my dissertation in on friday (i have over 18000 words done, i must have been working harder than I realised lol). I haven't had the chance to read through my notes yet No, don't rush for me. Work on your dissertation; that's more important. Take all the time you need. In any case, I hope you didn't think I was hounding you for an answer; I just wanted to make sure you knew I'd replied. It wasn't showing up under your "Replies Await" column and I didn't want you to think I'd just ignored you.
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