Papers › Experimental study of multiple-shot unitary channels discrimination using the IBM Q computers
Experimental study of multiple-shot unitary channels discrimination using the IBM Q computers
Adam Bílek, Jan Hlisnikovský, Tomáš Bezděk, Ryszard Kukulski, Paulina Lewandowska
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Tasks involving black boxes appear frequently in quantum computer science. An example that has been deeply studied is quantum channel discrimination. In this work, we study the discrimination between two quantum unitary channels in the multiple-shot scenario. We challenge the theoretical results concerning the probability of correct discrimination with the results collected from experiments performed on the IBM Quantum processor Brisbane. Our analysis shows that neither too deep quantum circuits nor circuits that create too much entanglement are suitable for the discrimination task. We conclude that circuit architectures which minimize entanglement overhead while preserving discrimination power are significantly more resilient to hardware noise if their depth does not overpass threshold value.
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