Text Size
Facebook Twitter More...

Thanks Art Wagner - also related article on optomechanics in latest Physics Today
Proposal to demonstrate the non-locality of Bohmian mechanics with entangled
photons
Boris Braverman1, 2 and Christoph Simon2
1Department of Physics, MIT-Harvard Center for Ultracold Atoms, and Research Laboratory of Electronics,
Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
2Institute for Quantum Information Science and Department of Physics and Astronomy,
University of Calgary, Calgary T2N 1N4, Alberta, Canada
Bohmian mechanics reproduces all statistical predictions of quantum mechanics, which ensures that entanglement cannot be used for superluminal signaling. However, individual Bohmian particles can experience superluminal influences. We propose to illustrate this point using a double double slit setup with path-entangled photons. The Bohmian velocity field for one of the photons can be measured using a recently demonstrated weak-measurement technique. The found velocities strongly depend on the value of a phase shift that is applied to the other photon, potentially at spacelike separation.


Nonlocal Interferometry Using Macroscopic Coherent States and Weak Nonlinearities

B. T. Kirby, J. D. Franson
(Submitted on 23 Jul 2012)
A straightforward method for performing nonlocal interferometry using macroscopic coherent states is described. The required entanglement can be generated using weak nonlinearities while Bell's inequality can be violated using single photons as a probe. A large number of photons can be absorbed with only a small reduction in the visibility of the nonlocal interference, which may be of practical use in quantum communications in addition to being of fundamental interest.
Comments:    4 pages, 5 figures
Subjects:    Quantum Physics (quant-ph)
Cite as:    arXiv:1207.5487v1 [quant-ph]
Submission history
From: James Franson [view email] [v1] Mon, 23 Jul 2012 19:12:18 GMT (238kb)
On Jul 28, 2012, at 1:41 PM, art wagner <This email address is being protected from spambots. You need JavaScript enabled to view it.> wrote:

http://xxx.lanl.gov/abs/1207.5487
 
Keith wrote:

Jack's idea is interesting b/c he's using standard quantum theory and exploring a corner case--distinguishable but non-orthogonal states which have interesting properties. Using the standard formalism, you find a modulation term that seems to be under the control of Alice, the sender. I get slightly different results depending on the specifics of how the signaling scheme is defined, but I so see a modulation term. The coherent states are subtle and so there could still be errors in what I've done, but there does seem to be something going on to me.

Jack Sarfatti • Yes, Keith, that is correct. You can force the effect to vanish by adhoc normalization, but that is a contradiction in the formalism. If the Born probability rule applies using normalized density operators and measurement projection operators should not require an adhoc second normalization. Since the coherent states are eigenstates of a non-Hermitian operator the usual conditions for the Born probability may not apply. This is an empirical question since forcing the second normalization is circular reasoning assuming what must be tested for by experiment. It's the orthogonality of base eigenstates of Hermitian operators that is assumed for the Born probability axiom to work.

21 minutes ago

 
Jack Sarfatti • Keith, relevant to this is P.W. Anderson's "phase rigidity" of spontaneous broken symmetry order parameters. The Glauber coherent states are such order parameters for a spontaneous broken global U1 gauge group corresponding to number-phase complementarity. The Glauber states have been generalized to any Lie Group G not just U1. It's this phase rigidity that is the cause of the violation of the Born probability rule in my opinion. However, one may also need a topological obstruction of some kind to get the phase rigidity. In superfluids it's the quantized vortices from the nonlinear term in the Landau-Ginzburg equation that replaces the Schrodinger eq (effective c-number IR field theory) that are the obstructions.

1 second ago


Category: MyBlog

Categories ...

't Hooft 100 Year Star Ship Abner Shimony accelerometers action-reaction principle Aephraim Sternberg Alan Turing Albert Einstein Alpha Magnetic Spectrometer American Institute of Physics Andrija Puharich Anthony Valentin Anton Zeilinger Antony Valentini anyon Apple Computer Artificial Intelligence Asher Peres Back From The Future Basil Hiley Bell's theorem Ben Affleck Ben Libet Bernard Carr Bill Clinton black body radiation Black Hole black hole firewall black hole information paradox black holes Bohm brain waves Brian Josephson Broadwell Cambridge University Carnot Heat Engine Central Intelligence Agency CIA Clive Prince closed time like curves coherent quantum state Consciousness conservation laws Cosmic Landscape Cosmological Constant cosmology CTC cyber-bullying Dancing Wu Li Masters Dark Energy Dark Matter DARPA Daryl Bem David Bohm David Deutsch David Gross David Kaiser David Neyland David Tong de Sitter horizon Dean Radin Deepak Chopra delayed choice Demetrios A. Kalamidas Demetrios Kalamidas Dennis Sciama Destiny Matrix Dick Bierman Doppler radars E8 group Einstein's curved spacetime gravity Einstein's happiest thought electromagnetism Eli Cartan EMP Nuclear Attack entanglement signals ER=EPR Eric Davis Ernst Mach ET Eternal Chaotic Inflation evaporating black holes Facebook Faster-Than-Light Signals? fictitious force firewall paradox flying saucers FQXi Frank Tipler Frank Wilczek Fred Alan Wolf Free Will G.'t Hooft Garrett Moddel Gary Zukav gauge theory general relativity Geometrodynamics Gerard 't Hooft Giancarlo Ghirardi God Goldstone theorem gravimagnetism gravity Gravity - the movie gravity gradiometers gravity tetrads Gravity Waves Gregory Corso gyroscopes hacking quantum cryptographs Hagen Kleinert Hal Puthoff Hawking radiation Heisenberg Henry Stapp Herbert Gold Higgs boson Higgs field hologram universe Horizon How the Hippies Saved Physics I.J. Good ICBMs Igor Novikov inertial forces inertial navigation Inquisition Internet Iphone Iran Isaac Newton Israel Jack Sarfatti Jacques Vallee James F. Woodward James Woodward JASON Dept of Defense Jeffrey Bub Jesse Ventura Jim Woodward John Archibald Wheeler John Baez John Cramer John S. Bell Ken Peacock Kip Thorne Kornel Lanczos La Boheme Laputa Large Hadron Collider Lenny Susskind Leonard Susskind Levi-Civita connection LHC CERN libel Louis de Broglie Lubos Motl LUX Lynn Picknett M-Theory Mach's Principle Mae Jemison Making Starships and Star Gates Martin Rees Mathematical Mind MATRIX Matter-AntiMatter Asymmetry Max Tegmark Menas Kafatos Michael Persinger Michael Towler microtubules Milky way MIT MOSSAD multiverse NASA Nick Bostrum Nick Herbert Nobel Prize nonlocality Obama organized-stalking Origin of Inertia P. A. M. Dirac P.K.Dick P.W. Anderson Paranormal parapsychology Paul Werbos Perimeter Institute Petraeus Physical Review Letters Physics Today Post-Quantum Physics pre-Big Bang precognition presponse PSI WARS Psychic Repression qualia Quantum Chromodynamics quantum computers quantum entanglement quantum field theory quantum gravity Quantum Information Theory Quantum Theory RAF Spitfires Ray Chiao Red Chinese Remote Viewing retrocausality Reviews of Modern Physics Richard Feynman Richard P. Feynman Rindler effect Robert Anton Wilson Robert Bigelow Roger Penrose rotating black holes Roy Glauber Rupert Sheldrake Russell Targ Ruth Elinor Kastner S-Matrix Sagnac effect Sam Ting Sanford Underground Research Facility Sarfatti Lectures in Physics Scientific American Second Law of Thermodynamics Seth Lloyd signal nonlocality Skinwalker Ranch social networks space drive space-time crystal SPECTRA - UFO COMPUTER spontaneous broken symmetry SRI Remote Viewing Experiments Stanford Physics Stanford Research Institute Star Gate Star Ship Star Trek Q Stargate Starship Stephen Hawking Steven Weinberg stretched membrane string theory strong force gluons Stuart Hameroff superconducting meta-material supersymmetry symmetries telepathy Templeton The Guardian Thought Police time crystal time travel topological computers Topological Computing torsion UFO Unitarity unitary S-Matrix false? Unruh effect Uri Geller VALIS virtual particle Virtual Reality Warp Drive weak force Wheeler-Feynman WIMP WMAP WMD world crystal lattice wormhole Yakir Aharonov Yuri Milner