Successfully reported this slideshow.
We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. You can change your ad preferences anytime.

Quantum Mechanics, Reality, & You

1,850 views

Published on

Weird, true, & out of control

Published in: Technology, Spiritual
  • Be the first to comment

  • Be the first to like this

Quantum Mechanics, Reality, & You

  1. 1. Quantum mechanics, Reality, & You John Ashmead
  2. 2. QM-RAY •“Behold the weird” •The collapse of the collapse of the wave function •Existential quantum mechanicsQM, Reality, & You - John Ashmead - May 27th, 2012 - Balticon http://timeandquantummechanics.com/?p=959
  3. 3. “Behold the weird” •Double slit experiment •Uncertainty principle •Checkpoint Copenhagen •Schrödinger’s CatQM, Reality, & You - John Ashmead - May 27th, 2012 - Balticon http://timeandquantummechanics.com/?p=959
  4. 4. Double slitQM, Reality, & You - John Ashmead - May 27th, 2012 - Balticon http://timeandquantummechanics.com/?p=959
  5. 5. Uncertainty principleQM, Reality, & You - John Ashmead - May 27th, 2012 - Balticon http://timeandquantummechanics.com/?p=959
  6. 6. Copenhagen interpretationQM, Reality, & You - John Ashmead - May 27th, 2012 - Balticon http://timeandquantummechanics.com/?p=959
  7. 7. Schrödingers Cat One can even set up quite ridiculous cases. A cat is penned up in a steel chamber, along with the following diabolical device (which must be secured against direct interference by the cat)…QM, Reality, & You - John Ashmead - May 27th, 2012 - Balticon http://timeandquantummechanics.com/?p=959
  8. 8. The collapse of the collapse of the wave function •Collapse real •Hidden variables •Multiverse •Shut-up-and-calculate •“That which does not destroy you…”QM, Reality, & You - John Ashmead - May 27th, 2012 - Balticon http://timeandquantummechanics.com/?p=959
  9. 9. Objective collapse •Wigner’s Calibrated Panel of Infants •The all collapse all the time channel •Penrose finds decoherence in a grain of sand •The case of the highly charged catQM, Reality, & You - John Ashmead - May 27th, 2012 - Balticon http://timeandquantummechanics.com/?p=959
  10. 10. Wigner’s Panel of infants 1. Perception counts as consciousness. 2. Consciousness induces deviations from laws of physics.QM, Reality, & You - John Ashmead - May 27th, 2012 - Balticon http://timeandquantummechanics.com/?p=959
  11. 11. Unified dynamics for microscopic & macroscopic systems (1986) - Ghirardi, Rimini, Weber •Eliminate special role of observer •Posit an interaction which is non-linear, stochastic, & depends on surround •Get a GRW collapse perhaps every 100 million yearsQM, Reality, & You - John Ashmead - May 27th, 2012 - Balticon http://timeandquantummechanics.com/?p=959
  12. 12. The road to reality • Tiny mirror in two states at once • With gravity involved, this costs energy • Forcing it to pick one of the two states. • And causing the beam to lose coherenceQM, Reality, & You - John Ashmead - May 27th, 2012 - Balticon http://timeandquantummechanics.com/?p=959
  13. 13. Highly charged cat Charge up your Let its wave function diffuse cat Observe your cat Accelerated charges radiate Tune your radioQM, Reality, & You - John Ashmead - May 27th, 2012 - Balticon http://timeandquantummechanics.com/?p=959
  14. 14. Hidden variables •Statistic interpretation •Einstein- Podolsky- Rosen: elements of reality •Bell’s theorem •Bohmian mechanicsQM, Reality, & You - John Ashmead - May 27th, 2012 - Balticon http://timeandquantummechanics.com/?p=959
  15. 15. Einstein podolsky rosen You can’t know both x-spin & z-spin at the same time, & yet you can.QM, Reality, & You - John Ashmead - May 27th, 2012 - Balticon http://timeandquantummechanics.com/?p=959
  16. 16. Bell’s Theorem Measure along x, or along z, or along their bisector, but only one measurement (of each spin) per round One poke per measurementQM, Reality, & You - John Ashmead - May 27th, 2012 - Balticon http://timeandquantummechanics.com/?p=959
  17. 17. Information Distance Information distance Information distance from A to B is the obeys the triangle uncertainty left in B inequality when A is known. d ( A,C ) ≤ d ( A, B ) + d ( B,C ) B d ( A, B ) d ( B,C ) A C d ( A,C )QM, Reality, & You - John Ashmead - May 27th, 2012 - Balticon http://timeandquantummechanics.com/?p=959
  18. 18. Information ZigZag 1.0 θ left θ right 0.8 0° 0.6 0.4 .020 .0 0.2 10° 50 100 150 .020 .064 ( ) ( ) d (θ ) = − lg cos 2 (θ 2 ) cos 2 (θ 2 ) − lg sin 2 (θ 2 ) sin 2 (θ 2 ) p ≡ cos 2 (θ 2 ) 20° θ = 10° → p (θ ) ≈ 99%, d ≈ .020 θ = 20° → p (θ ) ≈ 96%, d ≈ .064 .064 > .020 + .020 Violates triangle inequality!!!QM, Reality, & You - John Ashmead - May 27th, 2012 - Balticon http://timeandquantummechanics.com/?p=959
  19. 19. The right way to get it wrong Nick Herbert’s Faster-Than- Light Telegraph June 2012, Scientific AmericanQM, Reality, & You - John Ashmead - May 27th, 2012 - Balticon http://timeandquantummechanics.com/?p=959
  20. 20. Bohmian Mechanics • Well-defined particles • Guided by a pilot wave that obeys Schrödinger equation • Problems with many particles, high energies • Popular, if weirdQM, Reality, & You - John Ashmead - May 27th, 2012 - Balticon http://timeandquantummechanics.com/?p=959
  21. 21. Multiverse •Many worlds, many minds, many words •Quantum suicide/a plethora of observers •Splitting headachesQM, Reality, & You - John Ashmead - May 27th, 2012 - Balticon http://timeandquantummechanics.com/?p=959
  22. 22. Universes Fork Observers fork tooQM, Reality, & You - John Ashmead - May 27th, 2012 - Balticon http://timeandquantummechanics.com/?p=959
  23. 23. Experimental tests • Quantum suicide • Count of observers (many minds) has implications • Leakage between universesQM, Reality, & You - John Ashmead - May 27th, 2012 - Balticon http://timeandquantummechanics.com/?p=959
  24. 24. Splitting headaches • Why this set of alternatives & not that? • When does split happen? • How does split happen? • That’s rather a lot of "I am glad of all details," universes, isn’t it? remarked my friend, "whether they seem to • What counts as an observer? you to be relevant or not." • Can different universes chat?QM, Reality, & You - John Ashmead - May 27th, 2012 - Balticon http://timeandquantummechanics.com/?p=959
  25. 25. Shut-up-&-calculate •Arguably most popular •Let the pencil do the thinking. Or Mathematica. •Pencils a bit short on imagination sometimes.QM, Reality, & You - John Ashmead - May 27th, 2012 - Balticon http://timeandquantummechanics.com/?p=959
  26. 26. “What we call `reality’ consists of an elaborate papier-maché construction of imagination and theory fitted in between a few iron posts of observation.” - John A. WheelerQM, Reality, & You - John Ashmead - May 27th, 2012 - Balticon http://timeandquantummechanics.com/?p=959
  27. 27. Many Interpretations • Deterministic • Wave function real • Hidden variables • Collapse real • Observer part of interpretation • Local/non-local • Time symmetricQM, Reality, & You - John Ashmead - May 27th, 2012 - Balticon http://timeandquantummechanics.com/?p=959
  28. 28. “That which does not destroy you makes you strong” • 27+ rival interpretations •Critics such as Wigner, Bell, Einstein, … •300+ foundational experiments (Auletta)QM, Reality, & You - John Ashmead - May 27th, 2012 - Balticon http://timeandquantummechanics.com/?p=959
  29. 29. Existential Quantum mechanics •The wave function needs no interpretation •Decoherence •Radical conservatism •At the edge of the known •A game of chessQM, Reality, & You - John Ashmead - May 27th, 2012 - Balticon http://timeandquantummechanics.com/?p=959
  30. 30. Pusey, Barrett, & Rudolph •The quantum state of a system can be inferred uniquely from the physical state •Provided the predictions of quantum mechanics are correct. (They are.)QM, Reality, & You - John Ashmead - May 27th, 2012 - Balticon http://timeandquantummechanics.com/?p=959
  31. 31. Decoherence How does classical definiteness emerge from the quantum sea?QM, Reality, & You - John Ashmead - May 27th, 2012 - Balticon http://timeandquantummechanics.com/?p=959
  32. 32. Decoherence still cohering •Toy cases •Bound states •Quantum Zeno effect •Stochastic resonanceQM, Reality, & You - John Ashmead - May 27th, 2012 - Balticon http://timeandquantummechanics.com/?p=959
  33. 33. Radical conservatism Be conservative by sticking to well- •Cat states established physical •Long range entanglement principles, but probe them by exposing •Phonons their most radical conclusions. •Bose-Einstein condensates - J. A. Wheeler •Majorana fermionsQM, Reality, & You - John Ashmead - May 27th, 2012 - Balticon http://timeandquantummechanics.com/?p=959
  34. 34. At the edge of the known •Entropic gravity •Origin of the universe •Dark flow •Whispering gallery of the multiverseQM, Reality, & You - John Ashmead - May 27th, 2012 - Balticon http://timeandquantummechanics.com/?p=959
  35. 35. A game of chess •Multiple levels of analysis •Appropriate mathematics http://research.cs.queensu.ca/Parallel/ QuantumChess/QuantumChess.html •Your move!QM, Reality, & You - John Ashmead - May 27th, 2012 - Balticon http://timeandquantummechanics.com/?p=959

×