### Abstract

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

Article number | 032322 |

Number of pages | 9 |

Journal | Physical Review A |

Volume | 85 |

DOIs | |

Publication status | Published - 19 Mar 2012 |

### Fingerprint

### Keywords

- photon pairs
- quantum systems
- detectors
- photons

### Cite this

*Physical Review A*,

*85*, [032322]. https://doi.org/10.1103/PhysRevA.85.032322

}

*Physical Review A*, vol. 85, 032322. https://doi.org/10.1103/PhysRevA.85.032322

**Information communicated by entangled photon pairs.** / Barnett, Steve.

Research output: Contribution to journal › Article

TY - JOUR

T1 - Information communicated by entangled photon pairs

AU - Barnett, Steve

PY - 2012/3/19

Y1 - 2012/3/19

N2 - A key goal of quantum communication is to determine the maximum number of bits shared between two quantum systems. An important example of this is in entanglement-based quantum key distribution (QKD) schemes. A realistic treatment of this general communication problem must take account of the nonideal nature of the entanglement source and the detectors. The aim of this paper is to give such a treatment. We obtain analytic expression for the mutual information in terms of experimental parameters. The results are applied to communication schemes that rely on spontaneous parametric down conversion to generate entangled photons. We show that our results can be applied to tasks such as calculating the optimal rate of bits per photon in high-dimensional time-bin-encoded QKD protocols (prior to privacy amplification). A key finding for such protocols is that, by using realistic experimental parameters, one can obtain over 10 bits per photon. We also show how our results can be applied to characterize the capacity of a fiber array and to quantify entanglement using mutual information.

AB - A key goal of quantum communication is to determine the maximum number of bits shared between two quantum systems. An important example of this is in entanglement-based quantum key distribution (QKD) schemes. A realistic treatment of this general communication problem must take account of the nonideal nature of the entanglement source and the detectors. The aim of this paper is to give such a treatment. We obtain analytic expression for the mutual information in terms of experimental parameters. The results are applied to communication schemes that rely on spontaneous parametric down conversion to generate entangled photons. We show that our results can be applied to tasks such as calculating the optimal rate of bits per photon in high-dimensional time-bin-encoded QKD protocols (prior to privacy amplification). A key finding for such protocols is that, by using realistic experimental parameters, one can obtain over 10 bits per photon. We also show how our results can be applied to characterize the capacity of a fiber array and to quantify entanglement using mutual information.

KW - photon pairs

KW - quantum systems

KW - detectors

KW - photons

UR - http://www.scopus.com/inward/record.url?scp=84859093473&partnerID=8YFLogxK

UR - http://arxiv.org/abs/1203.1537

U2 - 10.1103/PhysRevA.85.032322

DO - 10.1103/PhysRevA.85.032322

M3 - Article

VL - 85

JO - Physical Review A - Atomic, Molecular, and Optical Physics

T2 - Physical Review A - Atomic, Molecular, and Optical Physics

JF - Physical Review A - Atomic, Molecular, and Optical Physics

SN - 1050-2947

M1 - 032322

ER -