Experimental witnessing of the quantum channel capacity in the presence of correlated noise

• URL: http://arxiv.org/abs/2007.09983v2
• Date: Wed, 21 Oct 2020 08:36:16 GMT
• Title: Experimental witnessing of the quantum channel capacity in the presence of correlated noise
• Authors: Valeria Cimini, Ilaria Gianani, Massimiliano F. Sacchi, Chiara Macchiavello and Marco Barbieri
• Abstract summary: We present an experimental method to detect lower bounds to the quantum capacity of two-qubit communication channels. We consider an implementation with polarisation degrees of freedom of two photons and report on the efficiency of such a method in the presence of correlated noise.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We present an experimental method to detect lower bounds to the quantum capacity of two-qubit communication channels. We consider an implementation with polarisation degrees of freedom of two photons and report on the efficiency of such a method in the presence of correlated noise for varying values of the correlation strength. The procedure is based on the generation of separable states of two qubits and local measurements at the output. We also compare the performance of the correlated two-qubit channel with the single-qubit channels corresponding to the partial trace on each of the subsystems, thus showing the beneficial effect of properly taking into account correlations to achieve a larger quantum capacity.

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