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arxiv: 1112.3141 · v2 · pith:WM55WEXZnew · submitted 2011-12-14 · 🪐 quant-ph

Necessary and sufficient conditions for local creation of quantum correlation

classification 🪐 quant-ph
keywords channelcommutativity-preservingcorrelationlocalquantumcompletelyconditiondecohering
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Quantum correlation can be created by a local operation from some initially classical states. We prove that the necessary and sufficient condition for a local trace-preserving channel to create quantum correlation is that it is not a commutativity-preserving channel. This condition is valid for arbitrary finite dimension systems. We also derive the explicit form of commutativity-preserving channels. For a qubit, a commutativity-preserving channel is either a completely decohering channel or a mixing channel. For a three-dimensional system (qutrit), a commutativity-preserving channel is either a completely decohering channel or an isotropic channel.

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