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Nonlinear steering criteria for arbitrary two-qubit quantum systems

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arxiv 2010.00083 v1 pith:6WJQ46D5 submitted 2020-09-30 quant-ph

Nonlinear steering criteria for arbitrary two-qubit quantum systems

classification quant-ph
keywords quantumstatessteeringcriteriaarbitrarycriterionnonlinearsome
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By employing Pauli measurements, we present some nonlinear steering criteria applicable for arbitrary two-qubit quantum systems and optimized ones for symmetric quantum states. These criteria provide sufficient conditions to witness steering, which can recover the previous elegant results for some well-known states. Compared with the existing linear steering criterion and entropic criterion, ours can certify more steerable states without selecting measurement settings or correlation weights, which can also be used to verify entanglement as all steerable quantum states are entangled.

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