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santecarloni

Physicists entangle 100,000 photons - physicsworld.com - 2 views

physicsworld.com/...icists-entangle-100000-photons

phy

shared by santecarloni on 29 Oct 12 - No Cached
LeopoldS liked it
  • santecarloni on 29 Oct 12
     
    Pulses of light comprising around 100,000 entangled photons have been created by physicists in Germany and Russia. 
santecarloni

How to Entangle Humans (contd) - Technology Review - 1 views

www.technologyreview.com/...how-to-entangle-humans-contd

technology PHY

shared by santecarloni on 23 Aug 12 - No Cached
  • santecarloni on 23 Aug 12
     
    If physicists are ever to entangle humans they'll need to understand the role that noise plays in the experiments. Now they've carried out the first tests to find out
Thijs Versloot

Time 'Emerges' from #Quantum Entanglement #arXiv - 1 views

medium.com/...d5d3dc850933

science quantum relativity

shared by Thijs Versloot on 23 Oct 13 - No Cached
  • Thijs Versloot on 23 Oct 13
     
    Time is an emergent phenomenon that is a side effect of quantum entanglement, say physicists. And they have the first exprimental results to prove it
  • ...5 more comments...
  • johannessimon81 on 23 Oct 13
     
    I always feel like people make too big a deal out of entanglement. In my opinion it is just a combination of a conserved quantity and an initial lack of knowledge. Imagine that I had a machine that always creates one blue and one red ping-pong ball at the same time (|b > and |r > respectively). The machine now puts both balls into identical packages (so I cannot observe them) and one of the packages is sent to Tokio. I did not know which ball was sent to Tokio and which stayed with me - they are in a superposition (|br >+|rb >), meaning that either the blue ball is with me and the red one in Tokio or vice versa - they are entangled. So far no magic has happened. Now I call my friend in Tokio who got the ball: "What color was the ball you received in that package?" He replies: "The ball that I got was blue. Why did you send me ball in the first place?" Now, the fact that he told me makes the superpositon wavefunction collapse (yes, that is what the Copenhagen interpretation would tell us). As a result I know without opening my box that it contains a red ball. But this is really because there is an underlying conservation law and because now I know the other state. I don't see how just looking at the conserved quantity I am in a timeless state outside of the 'universe' - this is just one way of interpreting it. By the way, the wave function for my box with the undetermined ball does not collapse when the other ball is observed by my friend in Tokio. Only when he tells me does the wavefunction collapse - he did not even know that I had a complementary ball. On the other hand if he knew about the way the experiment was conducted then he would have known that I had to have a red ball - the wavefunction collapses as soon as he observed his ball. For him it is determined that my ball must be red. For me however the superposition is intact until he tells me. ;-)
  • Luzi Bergamin on 24 Oct 13
     
    Sorry, Johannes, you just develop a simple hidden-parameters theory and it's experimentally proven that these don't work. Entangeled states are neither the blue nor the red ball they are really bluered (or redblue) till the point the measurement is done.
  • Luzi Bergamin on 24 Oct 13
     
    Hm, to me this looks like a bad joke... The "emergent time" concept used is still the old proposal by Page and Whotters where time emerges from something fundamentally unobservable (the wave function of the Universe). That's as good as claiming that time emerges from God. If I understand correctly, the paper now deals with the situation where a finite system is taken as "Mini-Universe" and the experimentalist in the lab can play "God of the Mini-Universe". This works, of course, but it doesn't really tell us anything about emergent time, does it?
  • johannessimon81 on 24 Oct 13
     
    Actually, it has not been proven conclusively that hidden variable theories don' work - although this is the opinion of most physicists these days. But a non-local hidden variable would still be allowed - I don't see why that could not be equivalent to a conserved quantity within the system. As far as the two balls go it is fine to say they are undetermined instead of saying they are in bluered or redblue state - for all intents and purposes it does not affect us (because if it would the wavefunction would have collapsed) so we can't say anything about it in the first place.
  • Luzi Bergamin on 24 Oct 13
     
    Non-local hidden variables may work, but in my opinion they don't add anything to the picture. The (at least to non-physicists) contraintuitive fact that there cannot be a variable that determines ab initio the color of the ball going to Tokio will remain (in your example this may not even be true since the example is too simple...).
  • johannessimon81 on 24 Oct 13
     
    I guess I tentatively agree with you on both points. In the end there might anyway be surprisingly little overlap between the way that we describe what nature does and HOW it does it... :-D
  • Luzi Bergamin on 24 Oct 13
     
    Congratulations! 100% agree.
Luís F. Simões

New Type Of Entanglement Allows "Teleportation in Time", Say Physicists - Technology Re... - 1 views

www.technologyreview.com/...26270

PHY entanglement time

shared by Luís F. Simões on 18 Jan 11 - No Cached
  • Conventional entanglement links particles across space. Now physicists say a similar effect links particles through time.
  • Ref: arxiv.org/abs/1101.2565: Extraction Of Timelike Entanglement From The Quantum Vacuum
Thijs Versloot

Quantum entanglement at ambient conditions in a macroscopic solid-state spin ensemble - 1 views

advances.sciencemag.org/...e1501015

technology quantum entanglement

shared by Thijs Versloot on 25 Nov 15 - No Cached
  • Thijs Versloot on 25 Nov 15
     
    Quoted from one of the authors in a separate interview: "We know that the spin states of atomic nuclei associated with semiconductor defects have excellent quantum properties at room temperature," said Awschalom, Liew Family Professor in Molecular Engineering and a senior scientist at Argonne National Laboratory. "They are coherent, long-lived and controllable with photonics and electronics. Given these quantum 'pieces,' creating entangled quantum states seemed like an attainable goal." Bringing the quantum world to the macroscopic scale could see some interesting applications in sensors, or generally entanglement-enhanced applications.
  • jcunha on 26 Nov 15
     
    They were previously working on the same concept in N-V centers in diamond (as a semiconductor). Here the advantage is that SiC could in principle be integrated with Si or Ge. Anyway its all about controlling coherence. In the next 10 years some breakthroughs are expected in the field of semiconductor spintronics, but quantum computing in this way lies still in the horizon
johannessimon81

Entangled photons make a picture from a paradox - 3 views

www.nature.com/...picture-from-a-paradox-1.15781

science PHY

shared by johannessimon81 on 28 Aug 14 - No Cached
  • johannessimon81 on 28 Aug 14
     
    Physicists have devised a way to take pictures using light that has not interacted with the object being photographed. This form of imaging uses pairs of photons, twins that are 'entangled' in such a way that the quantum state of one is inextricably linked to the other.
  • Ma Ru on 28 Aug 14
     
    The actual article: http://www.nature.com/nature/journal/v512/n7515/full/nature13586.html ScienceDaily version: "Scientists photograph the Schrödinger's cat for the first time!"
Juxi Leitner

Technology Review: Blogs: arXiv blog: Physicist Discovers How to Teleport Energy - 4 views

www.technologyreview.com/...24759

tech phy quantum entanglement nrg

shared by Juxi Leitner on 09 Feb 10 - Cached
pacome delva liked it
  • He gives the example of a string of entangled ions oscillating back and forth in an electric field trap, a bit like Newton's balls. Measuring the state of the first ion injects energy into the system in the form of a phonon, a quantum of oscillation. Hotta says that performing the right kind of measurement on the last ion extracts this energy. Since this can be done at the speed of light (in principle), the phonon doesn't travel across the intermediate ions so there is no heating of these ions. The energy has been transmitted without traveling across the intervening space.
  • Juxi Leitner on 09 Feb 10
     
    wonder if we can use that to power a moon base .... or on-board a SBSP satellite
  • ...1 more comment...
  • LeopoldS on 09 Feb 10
     
    will still have to read the actual article but am a bit sceptic if this interpretation really will hold ... what are our fundamental physicists saying about this?
  • Juxi Leitner on 10 Feb 10
     
    I am not the physicist but I thought it might be interesting, from a space security point-of-view
  • pacome delva on 11 Feb 10
     
    Yes it seems really interesting and opens new possibilities. However this technology review article is not very good and the guy uses terms which have a precise meaning (like teleportation), which is different from the word we know... Quantum teleportation is what we use for designing quantum computers, but we are quite far from any practical applications. This energy teleportation will allow new scheme involving energy (if it is experimentally confirmed) which is very nice. However it seems this occurs in an entangled many-body system, which the only macroscopic one I know is a bose-eintein condensate (BEC). So it would mean infuse energy in the BEC by doing a measurement on one of the atom and extract it few millimeters away by doing a measurement on another atom. very far from any long distance power transmission...
jaihobah

Entanglement is Necessary for Emergent Classicality in All Physical Theories - 0 views

journals.aps.org/...PhysRevLett.119.080503

PHY

shared by jaihobah on 28 Aug 17 - No Cached
  • jaihobah on 28 Aug 17
     
    "...We show that any theory with a classical limit must contain entangled states, thus establishing entanglement as an inevitable feature of any theory superseding classical theory. "
Tom Gheysens

'Spooky action' builds a wormhole between 'entangled' quantum particles - 2 views

www.sciencedaily.com/...131203161549.htm

science space quantum particles action

shared by Tom Gheysens on 04 Dec 13 - No Cached
  • Tom Gheysens on 04 Dec 13
     
    anna, this is your shit ;) ...and they mentione albert einstein so it has to be an intelligent and good finding :)
  • ...2 more comments...
  • Thijs Versloot on 04 Dec 13
     
    Somewhat longer explanation.. I am still completely ignorant on this level.. http://news.sciencemag.org/physics/2013/12/link-between-wormholes-and-quantum-entanglement
  • annaheffernan on 05 Dec 13
     
    Yeah I've actually been reading up on this - its linked to a previous post by Thijs on experiments NASA are carrying out with quantum teleportation.
  • LeopoldS on 09 Dec 13
     
    and?
  • LeopoldS on 12 Dec 13
     
    and?
pacome delva

Flights of fancy - 1 views

physics.aps.org/...PhysRevLett.104.220502

phy bio birds magnetic_field

shared by pacome delva on 08 Jun 10 - Cached
  • Could quantum entanglement help a flock of birds fly south for the winter? A team of scientists at the Akademie der Wissenschaften and the Universität Innsbruck, both in Austria, is looking at how concepts central to the field of quantum information—entanglement and coherence—play a role in the chemistry of magnetodetection that animals use for navigation.
jcunha

Why Quantum "Clippers" Will Distribute Entanglement Across The Oceans - 0 views

www.technologyreview.com/...entanglement-across-the-oceans

PHY FUN QM

shared by jcunha on 30 Oct 14 - No Cached
  • jcunha on 30 Oct 14
     
    Quantum internet will enable perfectly secure communications, but the technology and means to build the required quantum memories and routers are still many years distant. The proposal here is to store qubits and send them in containers over the oceans. Researchers claim that it is possible to send information at bandwidths measured in teraahertz outperforming the predictions of a quantum router internet. It can be thought in space systems as well. Then the problem is still for how long are we able to store a qubit, without dephasing... PS: As a curiosity, you can find a very interesting book about containers and how in some way they changed our world: Mark Levinson's book 'The Box' http://press.princeton.edu/titles/9383.html Maybe they will do it again
Marcus Maertens

Travel through wormholes is possible, but slow - 2 views

phys.org/...2019-04-wormholes.html

PHY space

shared by Marcus Maertens on 15 Apr 19 - No Cached
  • Marcus Maertens on 15 Apr 19
     
    Travelling through wormholes is not much different from quantum teleportation using entangled black holes...
LeopoldS

Phys. Rev. Lett. 108, 153605 (2012): Monolithic Source of Photon Pairs - 0 views

prl.aps.org/...e153605

physics quantum Entanglement

shared by LeopoldS on 18 Apr 12 - No Cached
  • LeopoldS on 18 Apr 12
     
    This is the first time that significant pair production has been demonstrated in a structure that can be electrically self-pumped and which can form the basis for passive optical circuitry, bringing us markedly closer to complete integration of quantum optical technologies.
LeopoldS

Physiker übertragen Quanteninformationen über 143 Kilometer - Technik - derSt... - 0 views

derstandard.at/...ormationen-ueber-143-Kilometer

Quantum PHY Entanglement

shared by LeopoldS on 05 Sep 12 - No Cached
  • LeopoldS on 05 Sep 12
     
    Zeilinger strikes again ...
Thijs Versloot

Quantum #teleportation theory to be tested on the #ISS - 8 views

phys.org/...eleportation-theory-space.html

science quantum ISS

shared by Thijs Versloot on 22 Oct 13 - No Cached
  • Thijs Versloot on 22 Oct 13
     
    A theory-SuperDense quantum teleportation-posed by Hampshire College physics professor Herbert Bernstein will be tested on the International Space Station. Theoretical physicist Bernstein devised the SuperDense scheme more than a decade ago in his investigations of different ways to send a quantum state from one part of a laboratory to a remote station.
  • LeopoldS on 27 Oct 13
     
    Anna could you have a closer look into this - we should at least know what they are up to, be able to explain if anybody asks ... I also somehow missed this one in the NIAC study descriptions ... maybe a good moment to have another look at these "This is the second NASA grant for SuperDense quantum teleportation. A grant awarded in 2010 through NASA Innovative Advanced Concepts (NIAC) investigated the viability of the theory and produced the world's first experimental demonstration. Surprising or seminal experiments have marked Bernstein's research career. This is the fourth time a major proposal has become reality; two of his experiments helped found new sub-fields of physics (neutron interferometry and entanglement for quantum information)."
Thijs Versloot

New Quantum Theory to explain flow of time - 2 views

www.wired.com/...quantum-theory-flow-time

energy quantum time

shared by Thijs Versloot on 26 Apr 14 - No Cached
  • Thijs Versloot on 26 Apr 14
     
    Basically quantum entanglement, or more accurately the dispersal and expansion of mixed quantum states, results in an apparent flow of time. Quantum information leaks out and the result is the move from a pure state (hot coffee) to a mixed state (cooled down) in which equilibrium is reached. Theoretically it is possible to get back to a pure state (coffee spontaneously heating up) but this statistical unlikelihood gives the appereance of irreversibility and hence a flow o time. I think an interesting question is then: how much useful work can you extract from this system? (http://arxiv.org/abs/1302.2811) It should for macroscopic thermodynamic systems lead to the Carnot cycle, but on smaller scales it might be possible to formulate a more general expression. Anybody interested to look into it? Anna, Jo? :)
  • johannessimon81 on 27 Apr 14
     
    What you propose is called Maxwell's demon: http://en.wikipedia.org/wiki/Maxwell%27s_demon Unfortunately (or maybe fortunately) thermodynamics is VERY robust. I guess if you really only want to harness AND USE the energy in a microscopic system you might have some chance of beating Carnot. But any way of transferring harvested energy to a macroscopic system seems to be limited by it (AFAIK).
pacome delva

Randomness is no lottery thanks to entangled ions - 0 views

physicsworld.com/...42310

phy quantum_cryptography quantum_entanglement

shared by pacome delva on 15 Apr 10 - Cached
  • An international team of physicists has created the first system that can produce verifiably random numbers. The technique relies on the inherent uncertainties in quantum mechanics and future versions could help cryptographers to encode information more securely than ever before.
Joris _

Physicists Propose Scheme for Teleporting Light Beams - 0 views

www.physorg.com/news166779852.html

PHY

shared by Joris _ on 15 Jul 09 - Cached
  • it’s possible that a physical object (e.g. a quantum field) in one location could emerge at another location in the same quantum state
  • pacome delva on 16 Jul 09
     
    have to be carefull this article is really badly written. Teleportation is not some matter that disapear from somewhere to reappear somewhere else... Usually we talk about entangled particles (by essence quantum theory is non-local), and teleportation means that if you force (with a measurement) one particle to take a particular quantum state then the other one will have the same quantum state. There it seems that the same could be done with a quantum field, which is the second quantization of the quantum theory: the state of a quantum field can contain a mixture of n-particles states (meaning that the number of particles is not defined, only the mean value). If you measure the number of particle then you force the quantum field to "choose" a particular quantum state (which can be the vacuum). Teleportation means that you will have exactly the same measure on another quantum field, which is somehow intricated to your first one.
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