### Abstract

Language | English |
---|---|

Article number | 193601 |

Number of pages | 4 |

Journal | Physical Review Letters |

Volume | 97 |

Issue number | 9-10 |

DOIs | |

Publication status | Published - 9 Nov 2006 |

### Fingerprint

### Keywords

- quantum
- optics
- physics
- quantum state
- qubit
- quantum information

### Cite this

*Physical Review Letters*,

*97*(9-10), [193601]. https://doi.org/10.1103/PhysRevLett.97.193601

}

*Physical Review Letters*, vol. 97, no. 9-10, 193601. https://doi.org/10.1103/PhysRevLett.97.193601

**Experimental realization of maximum confidence quantum state discrimination for the extraction of quantum information.** / Mosley, P.J.; Croke, S.; Walmsley, I.A.; Barnett, S.M.

Research output: Contribution to journal › Article

TY - JOUR

T1 - Experimental realization of maximum confidence quantum state discrimination for the extraction of quantum information

AU - Mosley, P.J.

AU - Croke, S.

AU - Walmsley, I.A.

AU - Barnett, S.M.

PY - 2006/11/9

Y1 - 2006/11/9

N2 - 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.

AB - 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.

KW - quantum

KW - optics

KW - physics

KW - quantum state

KW - qubit

KW - quantum information

UR - http://arxiv.org/PS_cache/quant-ph/pdf/0610/0610237v1.pdf

U2 - 10.1103/PhysRevLett.97.193601

DO - 10.1103/PhysRevLett.97.193601

M3 - Article

VL - 97

JO - Physical Review Letters

T2 - Physical Review Letters

JF - Physical Review Letters

SN - 0031-9007

IS - 9-10

M1 - 193601

ER -