Experimental detection of non-classical correlations in mixed state quantum computation

Details Experimental detection of non-classical correlations in mixed state quantum computation Experimental detection of non-classical correlations in mixed state quantum computation

2011-05-11

arxiv.org/abs/1105.2262v2

Phys. Rev. A. 84, 044302 (2011)

Physics

Quantum Physics

The second version more closely resembles that of the published manuscript

Scientific paper

10.1103/PhysRevA.84.044302

We report on an experiment to detect non-classical correlations in a highly mixed state. The correlations are characterized by the quantum discord and are observed using four qubits in a liquid state nuclear magnetic resonance quantum information processor. The state analyzed is the output of a DQC1 computation, whose input is a single quantum bit accompanied by n maximally mixed qubits. This model of computation outperforms the best known classical algorithms, and although it contains vanishing entanglement it is known to have quantum correlations characterized by the quantum discord. This experiment detects non-vanishing quantum discord, ensuring the existence of non-classical correlations as measured by the quantum discord.

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