Realizing quantum advantage without entanglement in single-photon states

Realizing quantum advantage without entanglement in single-photon states

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We Teething Wafers propose an optical circuit for attaining quantum measurement advantage in a system that has no quantum entanglement.Our device produces symmetric two-qubit X-states with controllable anti-diagonal elements, and does not require entangled states as input.We discuss the use of this device in a two-qubit quantum game.When entanglement is absent, the maximum quantum advantage in this game is 1/3 bit.A slightly diminished quantum advantage, 0.

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