منابع مشابه
How to Mix a Density Matrix
A given density matrix may be represented in many ways as a mixture of pure states. We show how any density matrix may be realized as a uniform ensemble. It has been conjectured that one may realize all probability distributions that are majorized by the vector of eigenvalues of the density matrix. We show that if the states in the ensemble are assumed to be distinct then it is not true, but a ...
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A simple probabilistic model is devised to determine the number of shuffles required for the bottom card of a deck to become uniformly distributed with a specified tolerance. This number is a lower bound on the number of shuffles needed for the entire deck to be randomly mixed. We wish to find a lower bound on the number of riffle shuffles required to mix a deck of k cards. In such a shuffle, t...
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In 2005, Chekitan Dev and Don Schultz introduced the customer focused marketing mix (SIVA) in Marketing Management. SIVA was presented as an alternative approach to McCarthy’s classic business orientated marketing mix popularly known as the 4Ps. SIVA and 4Ps are presented here as a complementary mechanisms to shape marketing practice through considering the needs of the customer within the cons...
متن کاملHow to break a practical MIX anddesign a new
A MIX net takes a list of ciphertexts (c1; ; cN) and outputs a permuted list of the plaintexts (m1; ; mN) without revealing the relationship between (c1; ; cN) and (m1; ; mN). This paper rst shows that the Jakobsson's MIX net of Eurocrypt'98, which was believed to be resilient and very eecient, is broken. We next propose an eecient t-resilient MIX net with O(t 2) servers in which the cost of ea...
متن کاملEntanglement or separability: the choice of how to factorize the algebra of a density matrix
Quantum entanglement has become a resource for the fascinating developments in quantum information and quantum communication during the last decades. It quantifies a certain nonclassical correlation property of a density matrix representing the quantum state of a composite system. We discuss the concept of how entanglement changes with respect to different factorizations of the algebra which de...
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ژورنال
عنوان ژورنال: Physical Review A
سال: 2003
ISSN: 1050-2947,1094-1622
DOI: 10.1103/physreva.67.012107