Quantum World

From: scerir (scerir@libero.it)
Date: Sat Apr 21 2001 - 18:14:27 MDT


David Deutsch <david.deutsch@qubit.org>

The "Multiverse"

The structure of the multiverse is determined by information flow.



Jan Sladkowski <sladk@server.phys.us.edu.pl>

"Quantum Market Games"

We propose a quantum-like description of markets and economics. The approach
has roots in the recently developed quantum game theory.



M. Ruzzi, D. Galetti

"Quantum Clock"

In this work we will advance farther along a line previously developed
concerning our proposal of a time interval operator, on finite dimensional
spaces. The time interval operator is Hermitian, and its eigenvalues are
time values with a precise and interesting role on the dynamics. With the
help of the Discrete Phase Space Formalism (DPSF) previously developed, we
show that the time interval operator is the complementary pair of the
Hamiltonian. From that, a simple system is proposed as a quantum clock. The
only restriction is that our results do not apply to all possible



Gavriel Segre <gavriel.segre@pv.infn.it>

"Quantum Casinos"

We introduce and analyze a quantum analogue of the Law of Excluded Gambling
Strategies of Classical Decision Theory by the definition of different kind
of quantum casinos. The necessity of keeping into account entaglement (by
the way we give a staightforward generalization of Schmidt's entanglement
measure) forces us to adopt the general algebraic language of Quantum
Probability Theory whose essential points are reviewed. The Mathematica code
of two packages simulating, respectively, classical and quantum gambling is
included. The deep link existing between the censorship of winning quantum
gambling strategies and the central notion of Quantum Algorithmic
Information Theory, namely quantum algorithmic randomness (by the way we
introduce and discard the naive noncommutative generalization of the
original Kolmogorov definition), is analyzed.


Todd Brun <tbrun@ias.edu>

"A Quantum Web Page"

In quantum teleportation, an unknown quantum state is transmitted from one
party to another using only local operations and classical communication, at
the cost of shared entanglement. Is possible similarly, using an N party
entangled state, to have the state retrievable by any of the N-1 possible
receivers? If the receivers cooperate, and share a suitable state, this can
be done reliably. The N party GHZ is one such state; I derive a large class
of such states, and show that they are in general not equivalent to the GHZ.
I also briefly discuss the problem where the parties do not cooperate, and
the relationship of this problem to the problem of multipartite entanglement



"Quantum Orgasm" (?)

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