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The CHSH-type inequalities for infinite-dimensional quantum systems

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arxiv 1308.3287 v1 pith:FWHV2GLQ submitted 2013-08-15 quant-ph math-phmath.MP

classification quant-phmath-phmath.MP
keywords inequalitieschsh-typeinfinite-dimensionalsystemschshentangledoperatorspure
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

By establishing CHSH operators and CHSH-type inequalities, we show that any entangled pure state in infinite-dimensional systems is entangled in a $2\otimes2$ subspace. We find that, for infinite-dimensional systems, the corresponding properties are similar to that of the two-qubit case: (i) The CHSH-type inequalities provide a sufficient and necessary condition for separability of pure states; (ii) The CHSH operators satisfy the Cirel'son inequalities; (iii) Any state which violates one of these Bell inequalities is distillable.

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