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Scientific article
English

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

Published inPhysics Letters. A, vol. 246, no. 1-2, p. 1-6
Publication date1998
Abstract

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 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 five 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.

Citation (ISO format)
GISIN, Nicolas, PASQUINUCCI, Helle Bechmann Johansen. Bell inequality, Bell states and maximally entangled states for <i>n</i> qubits. In: Physics Letters. A, 1998, vol. 246, n° 1-2, p. 1–6. doi: 10.1016/S0375-9601(98)00516-7
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ISSN of the journal0375-9601
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