Separable balls around the maximally mixed multipartite quantum states

Details Separable balls around the maximally mixed multipartite quantum states Separable balls around the maximally mixed multipartite quantum states

2003-02-12

arxiv.org/abs/quant-ph/0302102v1

Phys. Rev. A 68, 042312 (2003)

Physics

Quantum Physics

8 pages, LaTeX

Scientific paper

10.1103/PhysRevA.68.042312

We show that for an m-partite quantum system, there is a ball of radius 2^{-(m/2-1)} in Frobenius norm, centered at the identity matrix, of separable (unentangled) positive semidefinite matrices. This can be used to derive an epsilon below which mixtures of epsilon of any density matrix with 1 - epsilon of the maximally mixed state will be separable. The epsilon thus obtained is exponentially better (in the number of systems) than existing results. This gives a number of qubits below which NMR with standard pseudopure-state preparation techniques can access only unentangled states; with parameters realistic for current experiments, this is 23 qubits (compared to 13 qubits via earlier results). A ball of radius 1 is obtained for multipartite states separable over the reals.

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