Experimental Realization of Maximum Confidence State Discrimination for the Extraction of Quantum Information

Abstract

We present the first experimental demonstration of the maximum confidence measurement strategy for quantum state discrimination. Applying this strategy to an arbitrary set of states assigns to each input state a measurement outcome which, when realized, gives the highest possible confidence that the state was indeed present. The theoretically optimal measurement for discriminating between three equiprobable symmetric qubit states is implemented in a polarization-based free-space interferometer. The maximum confidence in the measurement result is 2/3. This is the first explicit demonstration that an improvement in the confidence over the optimal minimum error measurement is possible for linearly dependent states.

4 pages, 3 figures, to be published in PRL

References in corpus (9)

• Quantum State Discrimination
• Unambiguous Discrimination Between Linearly-Independent Quantum States
• Maximum Confidence Quantum Measurements
• Experimental Demonstration of Optimal Unambiguous State Discrimination
• Optical realization of optimal unambiguous discrimination for pure and mixed quantum states
• Optimal distinction between non-orthogonal quantum states
• Accessible information and optimal strategies for real symmetrical quantum sources
• Experimental realization of optimal detection strategies for overcomplete states
• Optimum detection for extracting maximum information from symmetric qubit sets

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