Bell inequality, Bell states and maximally entangled states for n qubits

Details Bell inequality, Bell states and maximally entangled states for n qubits Bell inequality, Bell states and maximally entangled states for n qubits

1998-04-20

arxiv.org/abs/quant-ph/9804045v1

Phys.Lett. A246 (1998) 1-6

Physics

Quantum Physics

8 pages, no figure

Scientific paper

10.1016/S0375-9601(98)00516-7

First, we present a Bell type inequality for n qubits, assuming that m out of the n qubits are independent. Quantum mechanics violates this inequality by a ratio that increases exponentially with m. Hence an experiment on n qubits violating of this inequality sets a lower bound on the number m of entangled qubits. Next, we propose a definition of maximally entangled states of n qubits. For this purpose we study 5 different criteria. Four of these criteria are found compatible. For any number n of qubits, they determine an orthogonal basis consisting of maximally entangled states generalizing the Bell states.

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