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S. L. Braunstein,1 C. M. Caves,2 R. Jozsa,3 N. Linden,4 S. Popescu,4,5 and R. Schack2,6 1SEECS, University of Wales, Bangor LL57 1UT, United Kingdom 2Center for Advanced Studies, Department of Physics and Astronomy, University of New Mexico, Albuquerque, New Mexico 87131-1156 3School of Mathematics and Statistics, University of Plymouth, Devon PL4 8AA,… (More)

- Daniel Collins, Nicolas Gisin, Noah Linden, Serge Massar, Sandu Popescu
- Physical review letters
- 2002

We develop a novel approach to Bell inequalities based on a constraint that the correlations exhibited by local variable theories must satisfy. This is used to construct a family of Bell inequalities for bipartite quantum systems of arbitrarily high dimensionality which are strongly resistant to noise. In particular, our work gives an analytic description… (More)

- Sandu Popescu
- 1997

We build, using group-theoretic methods, a general framework for approaching multi-particle entanglement. As far as entanglement is concerned, two states of n spin-1/2 particles are equivalent if they are on the same orbit of the group of local rotations (U(2)). We give a method for finding the number of parameters needed to describe inequivalent n spin-1/2… (More)

entanglement, quantum theory, quantum information, quantum computation, foundations of quantum mechanics Previous investigations of entanglement manipulations have focused on the average properties of the outcomes and little is known about the actual probability distribution. Here we go beyond the average properties. We show that, for a pure entangled state… (More)

- Noah Linden, Sandu Popescu, Anthony J. Short, Andreas J. Winter
- Physical review. E, Statistical, nonlinear, and…
- 2009

The circumstances under which a system reaches thermal equilibrium, and how to derive this from basic dynamical laws, has been a major question from the very beginning of thermodynamics and statistical mechanics. Despite considerable progress, it remains an open problem. Motivated by this issue, we address the more general question of equilibration. We… (More)

Charles H. Bennett, Sandu Popescu, Daniel Rohrlich, John A. Smolin, and Ashish V. Thapliyal IBM Research Division, Yorktown Heights, NY 10598, USA — bennetc, smolin@watson.ibm.com Isaac Newton Institute, Cambridge University, Cambridge, UK and BRIMS, Hewlett-Packard Labs., Stoke Gifford, Bristol BS12 6QZ, UK — sp230@newton.cam.ac.uk School of Physics and… (More)

- Sandu Popescu
- 1995

As is well known, quantum mechanical behavior cannot, in general, be simulated by a local hidden variables model. Most -if not allthe proofs of this incompatibility refer to the correlations which arise when each of two (or more) systems separated in space is subjected * present address: Tel Aviv University, School of Physics and Astronomy, Ramat Aviv, Tel… (More)

- Wolfgang Dür, Guifré Vidal, J. Ignacio Cirac, Noah Linden, Sandu Popescu
- Physical review letters
- 2001

We quantify the capability of creating entanglement for a general physical interaction acting on two qubits. We give a procedure for optimizing the generation of entanglement. We also show that a Hamiltonian can create more entanglement if one uses auxiliary systems.

We report on a quantum optical experimental implementation of teleportation of unknown pure quantum states. This realizes all the nonlocal aspects of the original scheme proposed by Bennett et al. and is equivalent to it up to a local operation. We exhibit results for the teleportation of a linearly polarised state and of an elliptically polarised state. We… (More)

- Nicolas J. Cerf, Nicolas Gisin, Serge Massar, Sandu Popescu
- Physical review letters
- 2005

It is known that all causal correlations between two parties which output each 1 bit, a and b, when receiving each 1 bit, x and y, can be expressed as convex combinations of local correlations (i.e., correlations that can be simulated with local random variables) and nonlocal correlations of the form a+b=xy mod 2. We show that a single instance of the… (More)