We 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 B-6 states as input.We discuss the use of this device in a two-qubit quantum JACKETS SPLIT SUIT BYRON game.When entanglement is absent, the maximum quantum advantage in this game is 1/3 bit.
A slightly diminished quantum advantage, 0.311 bit, can be realized with a simplified transaction protocol.