ua nt - p h / 03 11 15 4 v 1 2 3 N ov 2 00 3 Distinguishing a set of full product bases needs only projective measurements and classical communication

ar X iv : q ua nt - p h / 04 11 17 2 v 1 2 3 N ov 2 00 4 Information and Entropy in Quantum Theory

Distinguishing a set of full product bases needs only projective measurements and classical communication Ping -

Nonlocality without entanglement is an interesting field. A manifestation of quantum nonlocality without entanglement is the local indistinguishability of a set of orthogonal product states. In this paper we analyze the character of operators to distinguish a set of full product bases in a multi-partite system, and show that distinguishing perfectly a set of full product bases needs only local ...

ar X iv : q ua nt - p h / 04 09 18 4 v 2 2 5 N ov 2 00 4 Sets of Mutually Unbiased Bases as Arcs in Finite Projective Planes ?

This note is a short conceptual elaboration of the conjecture of Saniga et al (J. Opt. B: Quantum Semiclass. 6 (2004) L19-L20) by regarding a set of mutually unbiased bases (MUBs) in a d-dimensional Hilbert space as an analogue of an arc in a (finite) projective plane of order d. Complete sets of MUBs thus correspond to (d+1)-arcs, i.e., ovals. In the Desarguesian case, the existence of two pri...

ua nt - p h / 00 11 09 6 v 1 2 3 N ov 2 00 0 su ( 2 ) and su ( 1 , 1 ) displaced number states and their nonclassical properties

We study su(2) and su(1,1) displaced number states. Those states are eigenstates of density-dependent interaction systems of quantized radiation field with classical current. Those states are intermediate states interpolating between number and displaced number states. Their photon number distribution, statistical and squeezing properties are studied in detail. It is show that these states exhi...

ua nt - p h / 03 11 13 3 v 1 1 9 N ov 2 00 3 The Existence of Quantum Entanglement Catalysts ∗

A direct transformation between two quantum states through local quantum operations and classical communication is often impossible. Jonathan and Plenio [Phys. Rev. Lett. 86, 3566(1999)] presented an interesting example showing that the presence of another state, called a catalyst, can make such a transformation becoming possible. They also pointed out that in general it is very hard to find an...