# Re: Quantum Cryptography can not work

*From*: ttw@xxxxxxxxxxxxxxx*Date*: 25 Feb 2007 19:52:00 -0800

Entanglement has been experimentally observed.

A (simplified) description can be given. Single particle states are

represented by a matrix (say 2x2). Two particle states are represented

by a (Kronecker) product of two matrices (these are 4x4). There are

4x4 matrices that are not such Kronecker products but still represent

two particles. The lack of a factorization means that the two

particles are entangled.

.

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