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18
Experimental quantum teleportation
 Nature
, 1997
"... Quantum entanglement lies at the heart of new proposals for quantum communication and computation. Here we describe the recent experimental realization of quantum teleportation. ..."
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Quantum entanglement lies at the heart of new proposals for quantum communication and computation. Here we describe the recent experimental realization of quantum teleportation.
Physical versus Computational Complementarity I
, 1996
"... The dichotomy between endophysical/intrinsic and exophysical/extrinsic perception concerns the question of how a model  mathematical, logical, computational  universe is perceived from inside or from outside, [71, 65, 66, 59, 60, 68, 67]. This distinction goes back in time at least to Archimedes, ..."
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The dichotomy between endophysical/intrinsic and exophysical/extrinsic perception concerns the question of how a model  mathematical, logical, computational  universe is perceived from inside or from outside, [71, 65, 66, 59, 60, 68, 67]. This distinction goes back in time at least to Archimedes, reported to have asked for a point outside the world from which one could move the earth. An exophysical perception is realized when the system is laid out and the experimenter peeps at the relevant features without changing the system. The information flows on a oneway road: from the system to the experimenter. An endophysical perception can be realized when the experimenter is part of the system under observation. In such a case one has a twoway informational flow; measurements and entities measured are interchangeable and any attempt to distinguish between them ends up as a convention. The general conception dominating the sciences is that the physical universe is perceivable ...
Universal superposition of coherent states and selfsimilar potentials
 Physical Review A
, 2007
"... A variety of coherent states of the harmonic oscillator is considered. It is formed by a particular superposition of canonical coherent states. In the simplest case, these superpositions are eigenfunctions of the annihilation operator A = P(d/dx + x) / √ 2, where P is the parity operator. Such A ar ..."
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Cited by 11 (2 self)
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A variety of coherent states of the harmonic oscillator is considered. It is formed by a particular superposition of canonical coherent states. In the simplest case, these superpositions are eigenfunctions of the annihilation operator A = P(d/dx + x) / √ 2, where P is the parity operator. Such A arises naturally in the q → −1 limit for a symmetry operator of a specific selfsimilar potential obeying the qWeyl algebra, AA † −q 2 A † A = 1. Coherent states for this and other reflectionless potentials whose discrete spectra consist of N geometric series are analyzed. In the harmonic oscillator limit the surviving part of these states takes the form of orthonormal superpositions of N canonical coherent states ǫkα〉, k = 0,1,...,N −1, where ǫ is a primitive Nth root of unity, ǫN = 1. A class of qcoherent states related to the bilateral qhypergeometric series and Ramanujan type integrals is described. It includes a curious set of coherent states of the free nonrelativistic particle which is interpreted as a qalgebraic system without discrete spectrum. A special degenerate form of the symmetry algebras of selfsimilar potentials is found to provide a natural qanalog of the Floquet theory. Some properties of the factorization method, which is used throughout the paper, are discussed from the differential Galois theory point of view.
2000b). Nonlocality and quantum theory: new experimental evidence
"... Starting from the late 60’s many experiments have been performed to verify the violation Bell’s inequality by Einstein–Podolsky–Rosen (EPR) type correlations. The idea of these experiments being that: (i) Bell’s inequality is a consequence of locality, hence its experimental violation is an indicati ..."
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Starting from the late 60’s many experiments have been performed to verify the violation Bell’s inequality by Einstein–Podolsky–Rosen (EPR) type correlations. The idea of these experiments being that: (i) Bell’s inequality is a consequence of locality, hence its experimental violation is an indication of non locality; (ii) this violation is a typical quantum phenomenon because any classical system making local choices (either deterministic or random) will produce correlations satisfying this inequality. Both statements (i) and (ii) have been criticized by quantum probability on theoretical grounds (not discussed in the present paper) and the experiment discussed below has been devised to support these theoretical arguments. We emphasize that the goal of our experiment is not to reproduce classically the EPR correlations but to prove that there exist perfectly local classical dynamical systems violating Bell’s inequality. The conclusions of the present experiment are: (I) no contradiction between quantum theory and locality can be deduced from the violation of Bell’s inequality.
Embedding Quantum Universes in Classical Ones
, 1999
"... this paper; the propositional structure encountered in the quantum mechanics of spin  state measurements of a spin onehalf particle along two directions ( mod p) , that is, the modular, orthocomplemented lattice MO 2 drawn in Fig. 1 ( where p 2 = ( p + ) and q 2 = ( q + ) ) ..."
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this paper; the propositional structure encountered in the quantum mechanics of spin  state measurements of a spin onehalf particle along two directions ( mod p) , that is, the modular, orthocomplemented lattice MO 2 drawn in Fig. 1 ( where p 2 = ( p + ) and q 2 = ( q + ) )
Quantum Correlations Conundrum: An AutomatonTheoretic Approach
 Proceedings of WIA'99
, 1999
"... We develop an automatictheoretic analysis of EinsteinPodolskyRosen conundrum on the basis of two simple devices introduced by Mermin [10, 11]. ..."
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We develop an automatictheoretic analysis of EinsteinPodolskyRosen conundrum on the basis of two simple devices introduced by Mermin [10, 11].
A Quantum Mechanical Look At Time Travel and Free Will
, 2001
"... Consequences of the basic and most evident consistency requirementthat measured events cannot happen and not happen at the same timeare reviewed. Particular emphasis is given to event forecast and event control. As a consequence, particular, very general bounds on the forecast and control of e ..."
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Consequences of the basic and most evident consistency requirementthat measured events cannot happen and not happen at the same timeare reviewed. Particular emphasis is given to event forecast and event control. As a consequence, particular, very general bounds on the forecast and control of events within the known laws of physics result. These bounds are of a global, statistical nature and need not aect singular events or groups of events. We also present a quantum mechanical model of time travel and discuss chronology protection schemes. Such models impose restrictions upon certain capacities of event control.
Uncertainty rescued: Bohr’s complementarity for a composite system
 Physics Letters A
, 2000
"... Generalized uncertainty relations may depend not only on the commutator relation of two observables considered, but also on mutual correlations, in particular, on entanglement. The equivalence between the uncertainty relation and Bohr’s complementarity thus holds in a much broader sense than anticip ..."
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Generalized uncertainty relations may depend not only on the commutator relation of two observables considered, but also on mutual correlations, in particular, on entanglement. The equivalence between the uncertainty relation and Bohr’s complementarity thus holds in a much broader sense than anticipated. Key words: uncertainty relation, complementarity, quantum entanglement 1
Analogues of quantum complementarity in the theory of automata
 Studies in History and Philosophy of Modern Physics
, 1998
"... Complementarity is not only a feature of quantum mechanical systems but occurs also in the context of finite automata. http://tph.tuwien.ac.at/esvozil/publ/template.tex Preprint submitted to Elsevier Science 2 December 2003 1 Motivation The aim of this paper is to present to philosophers of physics ..."
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Complementarity is not only a feature of quantum mechanical systems but occurs also in the context of finite automata. http://tph.tuwien.ac.at/esvozil/publ/template.tex Preprint submitted to Elsevier Science 2 December 2003 1 Motivation The aim of this paper is to present to philosophers of physics some results in the theory of automata, especially the theory concerned with determining the initial state of the automaton: results which are analogons to the phenomena of "complementarity" or "nonBooleanness" which occur in quantum mechanics. It has long been known that any finite input/output system can be modelled by finite automata [Paz(1971)]. The study of finite automata was motivated from the very beginning by their analogy to quantum systems [Moore(1956),Foulis and Randall(1972),Randall and Foulis(1973)]. Finite automata are universal with respect to the class of computable functions in the (usual) sense that universal networks of automata can compute any e#ectively (Turing) computable function. Conversely, any feature emerging from finite automata is reflected by any other universal computational device. Their nonBoolean intrinsic propositional calculus closely resembles finite quantum mechanical systems [Svozil(1993),Schaller and Svozil(1994),Schaller and Svozil(1995),Schaller and Svozil(1996),Dvurecenskij et al.(1995)]. The considerations to follow in this article are not technically complicated. Nevertheless, the corresponding ideas turn out to be highly nontrivial and nonclassical, sometimes mindboggling [Greenberger et al.(1993)]. 2 Construction of automaton logics In this Section, I will first summarize some elements of the theory of finite automata; then discuss the socalled stateidentification problem, and how it gives rise to to nonBoolean lattices, a...